WO2011155066A1

WO2011155066A1 - Information recording device, information processing device, method for controlling disk device, and program for controlling disk device

Info

Publication number: WO2011155066A1
Application number: PCT/JP2010/059963
Authority: WO
Inventors: 公昭羽賀
Original assignee: 富士通株式会社
Priority date: 2010-06-11
Filing date: 2010-06-11
Publication date: 2011-12-15
Also published as: JPWO2011155066A1; JP5475881B2

Abstract

Disclosed is an information processing device comprising a plurality of disk devices for recording and replaying information, a detection unit for detecting sound or vibration of the plurality of disk devices, and a control unit which alternately repeats a selection operation and an adjustment operation, wherein the selection operation selects two devices from the plurality of disk devices, and the adjustment operation increases the number of revolutions of one of the two disk devices and decreases the number of revolutions of the other disk device so that the cycle of the envelope waveform of the sound or vibration can be extended with respect to the plurality of disk devices detected by the detection device.

Description

Information recording apparatus, information processing apparatus, disk apparatus control method, and disk apparatus control program

The present invention relates to an information recording device, an information processing device, a disk device control method, and a control program. The present invention relates to, for example, an information recording apparatus and an information processing apparatus having a plurality of disk devices, and a control method and a control program for the plurality of disk devices.

It has a motor that drives the disk-shaped recording medium at multiple rotational speeds, and controls vibration, noise, heat generation, etc. generated from the hard disk device by controlling one of the multiple rotational speeds according to the output of the vibration sensor. Technology to plan is known.

Also, in the disk array device, a technique is known in which only the synchronization signal lines of the disk devices having the same rotation speed can be connected to each other by switching the connection of the synchronization signal lines.

JP 2006-24326 A Japanese Patent Laid-Open No. 2001-1000094

It is an object to provide a configuration that can effectively reduce noise during operation of a plurality of disk devices.

Rotation of one of the two disk devices is selected such that two cycles are selected from the plurality of disk devices and the period of the envelope of the sound or vibration waveform of the plurality of disk devices is extended each time. Control is repeated to increase the number and decrease the rotational speed of the other disk device.

簡易 With a simple configuration, it is possible to effectively reduce noise during operation of multiple disk units.

It is a figure for demonstrating the noise of a magnetic disc unit. FIG. 3 is a diagram (part 1) for explaining a concept of a noise reduction method for a plurality of magnetic disk devices according to the first embodiment of the present invention; FIG. 6 is a diagram (No. 2) for explaining the concept of the noise reduction method for the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 3) for explaining the concept of the noise reduction method for the plurality of magnetic disk devices according to the first embodiment of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram (No. 1) showing a configuration example of an information processing system that automatically implements a method for adjusting the rotational speed of a plurality of magnetic disk devices according to Embodiment 1 of the present invention. FIG. 6 is a block diagram (No. 2) illustrating a configuration example of an information processing system that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to the first embodiment of the invention. It is FIG. (1) which shows the structural example of the information recording device which implements automatically the method of adjusting the rotation speed of the several magnetic disc apparatus by Example 1 of this invention. FIG. 6 is a diagram (No. 2) illustrating a configuration example of an information recording device that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 3) illustrating a configuration example of an information recording apparatus that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to the first embodiment of the invention. It is a block diagram which shows the structural example of the information processing system which automatically implements the method of adjusting the rotation speed of several magnetic disk apparatus by the modification 1 of Example 1 of this invention. It is a block diagram which shows the structural example of the information processing apparatus which automatically implements the method of adjusting the rotation speed of several magnetic disk apparatus by the modification 2 of Example 1 of this invention. FIG. 6 is a diagram (No. 1) for explaining a configuration example of a hard disk device that enables automatic execution of a method for adjusting the rotational speed of a plurality of magnetic disk devices according to Embodiment 1 of the present invention; FIG. 6 is a diagram (No. 2) for explaining the configuration example of the hard disk device that enables the method of adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the present invention to be automatically performed; For explaining a configuration example of a hard disk device required to realize a function of automatically executing a method of adjusting the rotational speed of a plurality of magnetic disk devices according to a first modification of the first embodiment of the present invention. FIG. 5 is a flowchart for explaining a flow of a method for adjusting the rotational speed of a plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 5 is a diagram (No. 1) for describing a specific example of the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention; FIG. 6 is a diagram (No. 2) for describing the specific example of the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 3) for explaining the specific example of the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 4) for explaining the specific example of the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 1) for explaining an example of a specific procedure in the method for adjusting the rotation speed of a plurality of magnetic disk devices according to the first embodiment of the invention; FIG. 8 is a diagram (No. 2) for explaining an example of a specific procedure in the method for adjusting the rotational speeds of the plurality of magnetic disk devices according to the first embodiment of the invention; FIG. 7 is a diagram (No. 3) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention; FIG. 8 is a diagram (No. 4) for explaining an example of a specific procedure in the method for adjusting the rotational speeds of the plurality of magnetic disk devices according to the first embodiment of the invention; FIG. 8 is a diagram (No. 5) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 6 is a diagram (No. 6) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 7 is a view (No. 7) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 10 is a diagram (No. 8) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 9 is a diagram (No. 9) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention. FIG. 10 is a diagram (No. 10) for explaining an example of a specific procedure in the method for adjusting the rotation speed of the plurality of magnetic disk devices according to the first embodiment of the invention; (11) for demonstrating an example of the specific procedure in the method of adjusting the rotation speed of the some magnetic disc unit by Example 1 of this invention. FIG. 6 is a block diagram (No. 1) illustrating a configuration example of an information processing system that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to a second embodiment of the present invention. FIG. 10 is a block diagram (No. 2) illustrating a configuration example of an information processing system that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to a second embodiment of the present invention. FIG. 10 is a block diagram (No. 3) illustrating a configuration example of an information processing system that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to a second embodiment of the invention. FIG. 11 is a block diagram (No. 1) showing another configuration example of an information processing system that automatically performs a method of adjusting the rotation speed of a plurality of magnetic disk devices according to a first modification of the second embodiment of the present invention. FIG. 10 is a block diagram (No. 2) showing another configuration example of the information processing system that automatically performs the method of adjusting the rotation speed of the plurality of magnetic disk devices according to the first modification of the second embodiment of the present invention. It is a block diagram which shows the structural example of the information processing apparatus which automatically implements the method of adjusting the rotation speed of several magnetic disk apparatus by the modification 2 of Example 2 of this invention. It is a block diagram which shows the other structural example of the information processing apparatus which automatically implements the method of adjusting the rotation speed of several magnetic disk apparatus by the modification 3 of Example 2 of this invention. The method for adjusting the rotational speed of a plurality of magnetic disk devices according to the second embodiment, the first variation of the second embodiment, the second variation of the second embodiment, and the third variation of the second embodiment is automatically implemented. It is a figure for demonstrating the structural example of the hard disk device which enables it to do. It is a flowchart for demonstrating the flow of the method of adjusting the rotation speed of the several magnetic disc apparatus by the modification 2 of Example 2 and Example 2 of this invention. It is a flowchart for demonstrating the flow of the method of adjusting the rotation speed of several magnetic disk apparatus by the modification 1 of Example 2 of this invention, and the modification 3 of Example 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail.

Suppose an information recording device or information processing device equipped with a plurality of magnetic disk devices, or an information processing system including the information recording device or information processing device. Furthermore, a situation is assumed in which the rotational speeds of the respective disk-shaped magnetic recording media (hereinafter simply referred to as magnetic disks) of the plurality of magnetic disk devices are shifted from each other. In the design, it is assumed that the rated rotational speeds of the respective magnetic disks of the plurality of magnetic disk devices coincide with each other (for example, 7200 [rpm]). However, due to various factors, it is considered difficult to make the rotational speeds of a plurality of magnetic disk devices exactly coincide with each other.

Variations in the rotational speed of the magnetic disks of the plurality of magnetic disk devices cause amplitude fluctuations in the waveform of the sound (synthetic sound) emitted by the plurality of magnetic disk apparatuses, and the amplitude fluctuations are noise (so-called “beat sound”). ) Is assumed. A roaring sound is a sound in which the intensity of the sound is repeated. Further, in the magnetic disk device, since the magnetic disk is rotated at a high speed to record information on the magnetic disk or to reproduce information from the magnetic disk, it is assumed that vibration occurs due to the rotation of the magnetic disk. When amplitude fluctuations occur in the vibration waveform of the plurality of disk devices due to the deviation of the rotational speeds of the magnetic disks of the plurality of disk devices, it may be assumed that periodic noise, that is, beat noise, is generated.

Hereinafter, the occurrence of amplitude fluctuations in the sound or vibration waveform will be described with reference to FIG. 1A. In FIG. 1A, the waveforms of “HDD # 1 noise” and “HDD # 2 noise” shown in the upper part indicate waveforms of sound or vibration generated by each of the two magnetic disk devices. Both waveforms are stable with a constant amplitude. However, when the frequencies of the two waveforms are slightly different from each other, it can be seen that the amplitude of the synthesized waveform (“synthetic noise”) shown in the lower stage in FIG. 1A periodically varies, and so-called “beat noise” is generated (FIG. 1A). (See “Synthetic Waveform Envelope”). Note that the frequencies of the two waveforms correspond to the rotation speeds of the two corresponding magnetic disk devices, respectively, and the cause of the roaring sound can be considered as a difference in the rotation speeds of the two magnetic disk devices. .

As a method for reducing such noise, for example, a method of increasing the mechanical strength of a housing (housing) that accommodates a magnetic disk device, or a method of using a combination of magnetic disk devices having similar basic rotational speeds of magnetic disks. Etc. are considered.

In Embodiment 1 of the present invention, sound (synthetic sound) or vibration (synthetic vibration) of a plurality of disk devices is measured, a measurement result is analyzed, and each magnetic disk of the plurality of disk devices is analyzed based on the analysis result. By adjusting the number of rotations, the beat noise is reduced. More specifically, beat noise is reduced by performing control to reduce the difference between the rotational speeds of the magnetic disks of a plurality of disk devices.

1B, 1C, and 1D, a method for performing control for reducing the difference between the rotational speeds of the magnetic disks of the plurality of disk devices according to the first embodiment of the present invention will be described. Each of FIGS. 1B, 1C, and 1D shows the waveform of the HDD # 1 noise and the waveform of HDD # 2 noise in the upper stage, and the envelope of the synthesized noise waveform and the synthesized noise waveform (synthetic waveform) in the lower stage, as in FIG. 1A. Indicates. Here, FIG. 1B shows the same state as FIG. 1A, and the difference in the rotational speed of the magnetic disk between the two magnetic disk devices is gradually reduced in the order of FIGS. 1B, 1C, and 1D. The difference in the rotational speed of the magnetic disk between the two magnetic disk devices is zero. The amplitude fluctuation period of the composite waveform (“synthetic noise”) (the peak period of the envelope of the composite waveform) gradually increases in the order of FIGS. 1B, 1C, and 1D. In the state of FIG. 1D, the envelope of the composite waveform The peak period is infinite. That is, as the rotational speed difference between the two magnetic disk devices is reduced, the peak period of the envelope of the composite waveform is extended, and as a result, the beat sound is reduced. When the rotation speeds coincide between the two magnetic disk devices (the state shown in FIG. 1D), the amplitude fluctuation of the synthesized waveform is eliminated and the beat sound disappears.

In the first embodiment of the present invention, noise or vibration generated by a plurality of magnetic disk devices is detected and analyzed, and control is performed to extend the period of the peak of the envelope of the noise or vibration, that is, the composite waveform, Reduces roaring noise.

As described above, according to the first embodiment of the present invention, each of the plurality of magnetic disk devices is monitored while monitoring the sound or vibration generated in the information recording device or information processing device equipped with the plurality of magnetic disk devices. The rotational speed of the magnetic disk is adjusted. As a result of adjusting the rotational speed of the magnetic disk, it is possible to reduce noise caused by deviations in the rotational speed of the magnetic disk between a plurality of magnetic disk devices or beat noise caused by vibration.

Note that examples of the information recording apparatus and the information processing apparatus to which the first embodiment of the present invention can be applied include a personal computer, a server, and a recording apparatus.

Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 2A is a block diagram illustrating a configuration example of the information processing system according to the first embodiment of the present invention. The information processing system illustrated in FIG. 2A includes a host computer 100 and an information recording device 200 that are connected to each other by, for example, an interface cable. The host computer 100 performs information processing using the information while writing information to the information recording apparatus 200 and reading information from the information recording apparatus 200.

The information recording device 200 accommodates a plurality of magnetic disk devices HDD-1, HDD-2,..., HDD-n in one housing (housing) and has a so-called disk array configuration. The host computer 100 writes information to the plurality of magnetic disk devices HDD-1 to HDD-n of the information recording device 200 and reads information from the plurality of magnetic disk devices HDD-1 to HDD-n. Can do. The information recording device 200 has a sensor circuit 210. In the first embodiment, the sensor circuit 210 is a microphone that detects noise from a plurality of magnetic disk devices HDD-1 to HDD-n. The microphone 210 is preferably installed at a position where sound from each of the plurality of magnetic disk devices HDD-1 to HDD-n can be detected evenly.

FIG. 2B is a block diagram illustrating a configuration example of the host computer 100. The host computer 100 includes a CPU (Central Processor Unit) Cph for calculating information and a memory Mmh used by the CPU (Cph) as a work area. The memory Mmh also stores a program executed by the CPU (Cph). The host computer 100 further includes an analysis / control arbitration unit Ca0 (which can be either hardware or software as will be described later) and a nonvolatile memory Mm0 which will be described later.

FIG. 3A is a block diagram showing a configuration of the magnetic disk device HDD-1 shown in FIG. 2A. The magnetic disk device HDD-1 includes a current control circuit Cc1 and a spindle motor (“motor” in the drawing) Mo1. The analysis / control arbitration unit Ca0 analyzes the sound detected by the microphone 210 and adjusts the rotational speed of the magnetic disk included in each of the plurality of magnetic disk devices HDD-1 to HDD-n. Here, the analysis / control arbitration unit Ca0 controls the sound detected by the microphone 210 and the control for adjusting the number of rotations of the magnetic disks respectively included in the plurality of magnetic disk devices HDD-1 to HDD-n. Including the mediation department. Details of the analysis unit in the analysis / control arbitration unit Ca0 will be described later with reference to FIGS. 3B and 3C. Details of the operation of the analysis / control arbitration unit Ca0 will be described later with reference to FIGS. 9, 10A to 10C, and FIGS. 11 and 12A to 12K. The non-volatile memory Mm0 is used by the analysis / control arbitration unit Ca0 to store a rotation speed setting value to be described later.

The spindle motor Mo1 rotates and drives the magnetic disk (not shown) of the magnetic disk device HDD-1. The current control circuit Cc1 generates a control current for driving the spindle motor Mo1, and controls the rotational speed of the magnetic disk by controlling the control current. The current control circuit Cc1 is controlled by the analysis / control arbitration unit Ca0 of the host computer 100.

Each of the other disk devices HDD-2 to HDD-n of the information recording device 200 has the same configuration as the disk device HDD-1. Accordingly, the rotational speed of each magnetic disk of the plurality of magnetic disk devices HDD-1 to HDD-n is controlled under the control of the analysis / control arbitration unit Ca0 of the host computer 100.

3B and 3C, an operation for obtaining the period of the sound pressure peak (that is, the peak period of the envelope of the sound pressure waveform) by the analysis unit included in the analysis / control arbitration unit Ca0 will be described. As illustrated in FIG. 3B, the analysis / control arbitration unit Ca0 includes an analysis unit Say and a control arbitration unit Cay. The analysis unit Say includes a diode Dy, a low-pass filter Ly, and a DSP (Digital Signal Processor) Dsy. As shown in FIG. 3B, the DSP (Dsy) includes an A / D (Analog-to-Digital) converter Ady, a memory My, and a CPU (Cpy).

In FIG. 3B, the diode Dy detects the sound pressure waveform detected by the microphone 210, and the low-pass filter Ly removes a high-band component of the sound pressure waveform, thereby obtaining an envelope on one side of the detected sound pressure waveform. . Here, the cut-off frequency of the low-pass filter Ly can be set to about 1/10 of the frequency corresponding to the rotational speed of each of the magnetic disk devices HDD-1 to HDD-n. For example, when the rotational speed of each of the magnetic disk devices HDD-1 to HDD-n is 7200 [rpm], the corresponding frequency is 7200/60 = 120 [Hz], so the cutoff frequency is 120/10 = It is about 12 [Hz].

In the DSP (Dsy), the analog value of the envelope on one side of the sound pressure waveform is digitized by sampling by the A / D converter Ady, and the sampling value is held in the memory My. The sampling frequency of the A / D converter Ady can be about 100 Hz or more when the cutoff frequency of the low-pass filter Ly is 12 Hz. Then, the CPU (Cpy) reads and analyzes the digital value (voltage value) of the envelope on one side of the sound pressure waveform from the memory My, and detects the peak of the envelope.

The operation in which the CPU (Cpy) detects the peak of the waveform will be described with reference to FIG. 3C. In FIG. 3C, the waveform Wa indicates the waveform of the envelope on one side of the above sound pressure waveform (“LPF output”), and the waveform Wb schematically shows a state in which the waveform Wa is sampled and digitized by the A / D converter Ady. Shown in A waveform Wc shows a state in which a circled portion of the waveform Wb is enlarged. The waveform Wc has a, b, c, d, e, f, g as voltage values of the digitized waveform, and the voltage difference between them is d1, d2, d3, d4, d5, d6, respectively. . Here, as shown in FIG. 3C, the voltage value gradually rises while the voltage value is a, b, c, d, e, and the voltage differences d1, d2, d3, and d4 have positive values. On the other hand, when the voltage value e, which is a peak, is passed, the voltage value of the waveform gradually decreases during the voltage values e, f, 、 g, and the voltage differences d5, d6 have negative values during that time. The CPU (Cpy) detects the peak of the envelope on one side of the sound pressure waveform by detecting the change of the voltage difference of the waveform voltage value from positive to negative. Further, the CPU (Cpy) obtains the peak period of the envelope curve on one side of the detected sound pressure waveform, determines whether or not the obtained peak period of the envelope curve increases with time, and determines the determination result. Notify the control arbitration unit Cay. The contents of the adjustment of the rotational speed of the magnetic disk performed by the control arbitration unit Cay in response to the determination result by the CPU (Cpy) will be described later with reference to FIGS. 9, 10A to 10C, 11, and 12A to 12K.

FIG. 4 is a block diagram illustrating a configuration of an information recording apparatus 200A according to the first modification of the information processing system according to the first embodiment described above with reference to FIGS. 2A, 2B, 3A, 3B, and 3C. In the first embodiment, the analysis / control arbitration unit Ca0 and the non-volatile memory Mm0 included in the host computer 100 are included in the information recording apparatus 200A as the analysis / control arbitration unit Ca0 and the non-volatile memory Mm1 in the first modification. Built in the disk device HDD-1. In the first modification of the first embodiment, the analysis / control arbitration unit Ca1 and the nonvolatile memory Mm1 can be configured similarly to the analysis / control arbitration unit Ca0 and the nonvolatile memory Mm0 of the first embodiment, respectively.

In the configuration of FIG. 4, the magnetic disk device HDD-1 includes an analysis / control arbitration unit Ca1, a nonvolatile memory Mm1, a current control circuit Cc1, and a spindle motor Mo1. The analysis / control arbitration unit Ca1 and the nonvolatile memory Mm1 have the same configurations and functions as the analysis / control arbitration unit Ca0 and the nonvolatile memory Mm0 in the first embodiment, respectively. In the case of Modification 1 shown in FIG. 4, the magnetic disk device HDD-1 functions as a master for adjusting the rotation speed of each of the magnetic disk devices HDD-1 to HDD-n. The spindle motor Mo1 and the current control circuit Cc1 have the same configuration and functions as the spindle motor Mo1 and the current control circuit Cc1 of the first embodiment. Each of the other disk devices HDD-2 to HDD-n of the information recording apparatus 200A has the same configuration as the disk devices HDD-2 to HDD-n in the first embodiment. In the first modification of the first embodiment, the rotational speed of each magnetic disk (not shown) of the plurality of magnetic disk devices HDD-1 to HDD-n is analyzed and controlled by the magnetic disk device HDD-1 as a master. It is adjusted under the control of the arbitration unit Ca1.

According to the first modification of the first embodiment in FIG. 4, the analysis / control arbitration unit Ca1 is built in the magnetic disk device HDD-1 included in the information recording device 200A. With such a configuration, the host computer 100 does not need to have an analysis / control arbitration unit, and versatility is improved.

FIG. 5 is a block diagram illustrating a configuration of an information processing system according to the second modification of the first embodiment. In the first embodiment described above with reference to FIGS. 2A, 2B, 3A, etc., the host computer 100 writes information to and reads information from the information recording apparatus 200, which is a separate body connected by an interface cable or the like. . On the other hand, in the second modification of the first embodiment shown in FIG. 5, the host computer 100A itself incorporates a plurality of magnetic disk devices HDD-1 to HDD-n included in the information recording device 200 shown in FIG. 2A. . The microphone 210 is preferably installed at a position in the host computer 100A where sound from each of the plurality of magnetic disk devices HDD-1 to HDD-n can be detected evenly. Further, the host computer 100A in FIG. 5 includes a CPU (Cpx), a memory Mmx, an analysis / control arbitration unit Ca0, and a nonvolatile memory Mm0. The CPU (Cpx), the memory Mmx, the analysis / control arbitration unit Ca0, and the nonvolatile memory Mm0 are respectively the CPU (Cph), the memory Mmh, the analysis / control arbitration unit Ca0, and the host computer 100 shown in FIG. The configuration is the same as that of the nonvolatile memory Mm0. Each of the plurality of magnetic disk devices HDD-1 to HDD-n has the same configuration as the disk devices HDD-1 to HDD-n in the first embodiment. In the second modification of the first embodiment, the rotational speed of each magnetic disk (not shown) of the plurality of magnetic disk devices HDD-1 to HDD-n in the host computer 100A is analyzed and controlled in the host computer 100A. It is adjusted under the control of the arbitration unit Ca0.

Next, the configuration of the current control circuit (current control circuit Cc1 in the case of HDD-1) in each of the magnetic disk devices HDD-1 to HDD-n will be described with reference to FIGS.

6 includes a rotation speed detection circuit Rd, a rotation control circuit Rc, and a motor driver Md. The rotational speed detection circuit Rd compares the speed command signal received from the analysis / control arbitration unit with the speed feedback signal obtained from the spindle motor Sm (corresponding to the spindle motor Mo1). The speed feedback signal is, for example, an index signal. The index signal is a signal having one pulse generated every time the spindle motor Sm rotates once. The speed command signal is a signal for controlling the rotation of the spindle motor Sm, which is output from the analysis / control arbitration unit (analysis / control arbitration unit Ca1 in the case of HDD-1 in FIG. 4). Is a signal having one pulse. The rotation speed detection circuit Rd compares the pulse frequency of the speed command signal and the speed feedback signal, finds the difference between the rotation speed indicated by the speed command signal and the rotation speed of the spindle motor Sm indicated by the speed feedback signal. A signal indicating the number difference is output. The rotation control circuit Rc outputs a control signal corresponding to the signal output from the rotation speed detection circuit Rd to the motor driver Md, thereby rotating the spindle motor Sm via the motor driver Md at the rotation speed indicated by the speed command signal. To control.

FIG. 7 is a block diagram showing the overall configuration of the magnetic disk device HDD applicable as each of the magnetic disk devices HDD-1 to HDD-n. The magnetic disk device HDD has a buffer circuit Bf, a hard disk controller circuit Hd, a channel circuit Cn, a spindle motor current control circuit Sc, a voice coil motor current control circuit Vc, and a CPU (Cp). The magnetic disk device HDD further includes a head amplifier circuit Ha, a spindle motor Sm, a voice coil motor Vm, a magnetic head Mh, and a magnetic disk Dc.

The buffer circuit Bf functions as a cache and exchanges data with the hard disk controller circuit Hd. The hard disk controller circuit Hd performs cache control and interface control. The channel circuit Cn receives write data from the hard disk controller circuit Hd and transmits read data to the hard disk controller circuit Hd. The channel circuit Cn demodulates read data read from the magnetic disk Dc and modulates write data to be written to the magnetic disk Dc. The head amplifier circuit Ha receives and amplifies the read signal read from the magnetic disk Dc from the magnetic head Mh, generates read data, and transmits the read data to the channel circuit Cn. The head amplifier circuit Ha generates and amplifies a write signal from the write data received from the channel circuit Cn, and transmits it to the magnetic head Mh. The magnetic head Mh detects a read signal from the magnetic disk Dc, transmits it to the head amplifier circuit Ha, and writes the write signal received from the head amplifier circuit Ha to the magnetic disk Dc.

CPU (Cp) controls the entire magnetic disk drive HDD. The spindle motor current control circuit Sc generates a control current and outputs it to the spindle motor Sm, controls the spindle motor Sm, and receives a speed feedback signal from the spindle motor Sm. The voice coil motor current control circuit Vc generates a control current and outputs it to the voice coil motor Vm, controls the voice coil motor Vm, and receives a speed feedback signal from the voice coil motor Vm. The spindle motor Sm rotates the magnetic disk Dc. The voice coil motor Vm drives the magnetic head Mh via a head arm (not shown), and performs a seek operation on the magnetic disk Dc. The seek operation is an operation in which the magnetic head Mh is moved on the magnetic disk Dc to reach a desired track on the magnetic disk Dc.

FIG. 8 shows a configuration example of the magnetic disk device HDD-1 applicable as the magnetic disk device HDD-1 as the master in the first modification of the first embodiment. The configuration in FIG. 8 is basically the same as the configuration of the magnetic disk device HDD in FIG. 7 described above, and the same components are denoted by the same reference numerals and redundant description is omitted. The configuration of FIG. 8 is different from the configuration of FIG. 7 in that an analysis / control arbitration unit Ca1 and a nonvolatile memory Mm1 are added. The analysis / control arbitration unit Ca1 is inserted between the CPU (Cp) and the spindle motor current control circuit Sc, and as described above, each of the magnetic disks of the plurality of magnetic disk devices HDD-1 to HDD-n. Adjust the rotation speed. The non-volatile memory Mm1 is used for storing a rotational speed setting value to be described later.

Next, the operation of adjusting the rotational speed of the magnetic disk by the control / arbitration unit Cay of the analysis / control arbitration unit Ca0 or Ca1 shown in FIG. 3B will be described. Note that the sound generated by the magnetic disk device may be due to a seek operation other than the spindle motor that rotates the magnetic disk. Therefore, it is desirable to eliminate the influence of the sound due to the seek operation unrelated to the operation of adjusting the rotational speed of the magnetic disk by the control arbitration unit Cay. Therefore, when measuring the beat sound for adjusting the rotational speed of the magnetic disk, the initialization time during which only the spindle motor rotates without performing the seek operation in each of the plurality of magnetic disk devices HDD-1 to HDD-n. Is provided. The sound generated at the initialization time is detected by the microphone 210, and the analysis unit Say of the analysis / control arbitration unit Ca0 or Ca1 determines the peak period of the envelope of the composite waveform by the configuration described above with reference to FIGS. 3B and 3C. Ask.

The adjustment operation of the rotational speed of the magnetic disk by the control arbitration unit Cay is performed with a plurality of magnetic disk devices HDD-1˜HDD aiming at making the peak period of one envelope of the detected sound pressure waveform close to infinity. The rotational speed of each magnetic disk of the HDD-n is adjusted. The cause of the amplitude fluctuation of the detected sound pressure waveform is considered to be the mutual deviation of the rotational speeds of the magnetic disks of the plurality of magnetic disk devices HDD-1 to HDD-n. For this reason, control is performed so that the rotational speed of each magnetic disk approaches the average value of the rotational speeds of both.

More specifically, two different magnetic disk devices are sequentially selected from a plurality of magnetic disk devices HDD-1 to HDD-n. Each time two magnetic disk devices are selected, control is performed so that the rotational speed of the magnetic disk between the two selected magnetic disk devices is close to the rotational speed obtained by averaging both rotational speeds. In this way, the selection operation of the two magnetic disk devices and the control of bringing the rotation speed of the magnetic disk to the average rotation speed for the two selected disks are repeated. By adjusting the rotational speed of the magnetic disks, the rotational speed of the magnetic disks of all the magnetic disk devices gradually approaches the averaged rotational speed, and as a result, the synthesis of the sound emitted from all the magnetic disk devices The period of the peak of the sound envelope approaches infinity. As a result, beat noise is reduced.

Here, an example of an adjustment operation for bringing the rotation speed of the magnetic disk between the two magnetic disk devices close to the average rotation speed will be described below. In other words, the rotation of the disks of the two magnetic disk devices so as to extend the peak period of the envelope of the synthesized sound of each sound generated by a plurality of magnetic disk devices HDD-1 to HDD-n including two. Adjust the number.

The flow of the adjustment operation of the rotational speed of the magnetic disk by the control mediation unit Cay in each of the first modification of the first embodiment, the first modification of the first embodiment, and the second modification of the first embodiment will be described below with reference to FIG. . As described above with reference to FIGS. 1A to 1D, as the rotational speed difference between the two magnetic disk devices is reduced, the peak period of the envelope of the synthesized waveform of the sound of each of the two magnetic disks is increased, resulting in a beat. Sound is reduced. When the rotational speeds are the same between the two magnetic disk devices (the state shown in FIG. 1D), the amplitude fluctuation of the combined waveform is eliminated. Therefore, in the control of FIG. 9, the rotational speed of the magnetic disk is adjusted so that the peak period of the envelope of the sound pressure waveform of the synthesized sound of the plurality of magnetic disk devices HDD-1 to HDD-n is extended.

The power supply of the information processing system is turned on (step S1). When the rotational speed of each of the magnetic disk devices HDD-1 to HDD-n reaches the steady rotational speed (step S2), the seek operation of each magnetic disk device is prohibited (initialization time). Next, the envelope peak period of the sound pressure waveform of the synthesized sound of the plurality of magnetic disk devices HDD-1 to HDD-n detected by the microphone 210 (hereinafter simply referred to as “envelope peak period”). Is obtained (step S3). As a method of obtaining the envelope peak period, for example, the method described above with reference to FIG. 3C can be employed. Next, two different units are sequentially selected from the plurality of magnetic disk devices HDD-1 to HDD-n, and a plurality of combinations of the two units are set (step S4). When the number (n) of magnetic disk devices is an even number, “number × n / 2” combinations are obtained. On the other hand, when there are an odd number of magnetic disk devices, a combination of “number × (n−1) / 2” is obtained.

A set of magnetic disk devices is extracted from the combinations of magnetic disk devices thus set (step S5). The rotational speed of one of the two magnetic disk devices belonging to the extracted combination is increased to a first predetermined rotational speed, for example, two (+2 [rpm]), and the rotational speed of the other magnetic disk device is set to the first. (2 [rpm]) (step S6). As a result, it is confirmed whether or not the envelope peak period has been extended (step S7). If the period of the peak of the envelope has not increased (NO in S7), the process proceeds to step S8. In step S8, it is confirmed whether the period of the peak of the envelope has been extended by switching the respective targets for increasing and decreasing the rotational speed of the magnetic disk between the two magnetic disk devices belonging to the combination ( It is determined whether or not steps S9, S6, S7) have been performed. If the subject has not yet been exchanged and it has not been confirmed whether the envelope peak period has been extended (NO in S8), the process proceeds to step S9. In step S9, the targets for increasing and decreasing the rotational speed of the magnetic disk are switched between the two magnetic disk devices belonging to the set of combinations (step S9). Then, the rotation speed of the magnetic disk is increased and decreased (step S6), and the process proceeds to step S7.

On the other hand, if the target has already been replaced and it has been confirmed whether or not the envelope peak period has been extended (YES in S8), the envelope peak period of the synthesized sound of the sounds emitted from all the magnetic disk devices is The rotational speed setting value of the two magnetic disk devices in the above combination is stored in the nonvolatile memory Mm0 or Mm1 (step S12). Here, the rotation speed setting value refers to the rotation speed indicated by the speed command signal described above with reference to FIG. In addition, the value stored last in the nonvolatile memory as the rotation speed setting value of each magnetic disk device is used as the final (optimal) rotation speed setting value of each magnetic disk device. In this way, the rotational speed setting value is set for each magnetic disk device.

If it is determined in step S7 that the period of the peak of the envelope has been extended (YES in S7), the rotational speed of the magnetic disk device whose rotational speed is increased (increased) in S6 is set to the second predetermined rotational speed. The number of rotations of the magnetic disk device, for example, increased by one rotation (+1 [rpm]) and decreased (decrease) in S6, is decreased by a second predetermined rotation number (−1 [rpm]) The number of rotations of the disk is finely adjusted (step S10). As a result, it is determined whether or not the envelope peak period has been extended (step S11). If the envelope peak period has not been extended (NO in S11), it is determined that the envelope peak period of the synthesized sound of sounds generated from all the magnetic disk devices is the longest, and step S12 is executed. On the other hand, if it is determined in step S11 that the period of the peak of the envelope has been extended (YES in S11), the increase and decrease of the rotational speed of the magnetic disk in step S10 are executed again.

In steps S6 and S10, the rotation speed of the magnetic disk of each magnetic disk device is increased and decreased within the range of the limit value of the predetermined rotation speed. This is to prevent the rotation speed of the magnetic disk of each magnetic disk device from exceeding the normal operating range of the magnetic disk device. Therefore, if steps S6 and S10 are performed and the range of the predetermined rotational speed limit value is exceeded, the rotational speed of the magnetic disk in the same step is not increased and decreased, and the process proceeds to the next step.

After execution of step S12, it is determined whether or not the operations of steps S6 to S12 have been completed for all combinations of magnetic disk devices obtained in step S4 (step S13). When the operations in steps S6 to S12 have been completed for all the combinations obtained in step S4 (YES in S13), it is determined whether or not all possible combinations of magnetic disk devices have been set in step S4 (step S4). S15). In other words, in step S15, it is determined whether or not the confirmation operations shown in S6 to S9 have been executed for all possible combinations of magnetic disk devices.

If it is determined in step S15 that all possible combinations of magnetic disks have been set in S4 (YES in S15), the operation in FIG. 9 (one cycle operation) is terminated. Thereafter, if necessary, the operation from step S4 is repeated as the operation of the next cycle.

In step S13, if the operations in steps S6 to S12 have not been completed for all the combinations obtained in step S4 (NO in S13), a combination of other magnetic disk devices that has not yet been extracted is selected (step S13). S14). Then, the operation starting from step S6 is executed for the two magnetic disk devices belonging to the combination extracted in S14.

If it is determined in step S15 that not all possible combinations have been set in S4 (NO in S15), the combination is different from the combination of magnetic disk devices set in S4 and a new one that has not been set yet. A combination of magnetic disk devices is set (step S16). Then, for the combination of the magnetic disk devices set in S16, the operation starting from Step S5 is executed.

If the number of magnetic disk devices is an odd number, in step S16, the magnetic disk device is preferentially included in the new combination, with one magnetic disk device leaking from the combination of magnetic disk devices set in S4. It is desirable to set a combination of devices.

Next, with reference to FIGS. 10A, 10B, 10C, and 11, a specific example of the operation of FIG. 9 will be described by taking the case of five magnetic disk devices as an example. Here, it is assumed that the first and second predetermined rotational speeds are predetermined values smaller than 1. 10A to 10C and FIG. 11, # 1 to # 5 indicate magnetic disk devices, respectively.

FIG. 10A shows a total of two combinations of the magnetic disk devices in the first round: the combination of # 1, # 2 and the combination of # 3, # 4 among the five magnetic disk devices # 1 to # 5. The example which set the combination is shown. FIG. 10B shows an example in which a total of two combinations of # 2, # 3 and # 4, # 5, which are different from those in FIG. Show. FIG. 10C shows a total of two combinations of # 1, # 3 and # 2, # 5, which are different from those of FIG. 10A and FIG. An example of setting is shown.

FIG. 11 shows changes in the rotational speeds of the five magnetic disk devices # 1 to # 5 (rated rotational speed: n) when the adjustment operation of FIG. 9 is performed. Each numerical value shown in FIG. 11 indicates the number of rotations of a difference with respect to n rotations. In the initial state of FIG. 11 (“initial” in the figure), the rotational speeds of the five magnetic disk devices # 1 to # 5 are n + 2, n + 1, n, n−1, and n−2, respectively. . In the case of the example of FIG. 11, for convenience of explanation, the rotation speeds of the magnetic disks of the two magnetic disk devices in each combination are ideally adjusted. As a result of the rotation speed adjustment of the magnetic disk devices, the combined 2 A situation is assumed in which the number of rotations of the magnetic disk device is the average number of both rotations. In FIG. 11, the same type of shading is applied to each of the two magnetic disk devices to be combined at each time point.

In the case of FIG. 11, in the operation of the first round, the combination of # 2, # 3 and the combination of # 4, # 5 are set. As a result (in the figure, “after completion of one round”), the rotational speeds of # 2 and # 3 are averaged to be n + 0.5 and n + 0.5. Similarly, the rotational speeds of # 4 and # 5 are averaged to be n-1.5 and n-1.5.

In the second round of operation, a combination of # 1, # 2 and a combination of # 3, # 5 are set. As a result (in the figure, “after completion of the second round”), the rotational speeds of # 1 and # 2 are averaged to be n + 1.25 and n + 1.25. Similarly, the rotational speeds of # 3 and # 5 are averaged to be n-0.5 and n-0.5.

In the operation of the third round, the combination of # 1, # 4 and the combination of # 2, # 5 are set. As a result (in the figure, “after three rounds are completed”), the rotational speeds of # 1 and # 4 are averaged to be n−0.125 and n−0.125. Similarly, the rotational speeds of # 2 and # 5 are averaged to be n + 0.375 and n + 0.375.

In the fourth round operation, the combination of # 1, # 5 and the combination of # 3, # 4 are set. As a result (in the figure, “after completion of four rounds”), the rotational speeds of # 1 and # 5 are averaged to be n + 0.125 and n + 0.125. Similarly, the rotation speeds of # 3 and # 4 are averaged to be n-0.3125 and n-0.3125.

In the fifth round operation, the combination of # 1, # 3 and the combination of # 2, # 4 are set. As a result (in the figure, “after completion of one cycle”), the rotational speeds of # 1 and # 3 are averaged to be n−0.09375 and n−0.09375. Similarly, the rotation speeds of # 2 and # 4 are averaged to be n + 0.03125 and n + 0.03125.

As described above, in the example of FIG. 11, the operation of averaging two magnetic disks and averaging the rotational speeds of the magnetic disks is repeated while sequentially changing the combination of the two disks, so that the rotational speeds of the five magnetic disks are as a whole. You can see how they are averaged. That is, in the initial state, the maximum difference in the rotational speed of the five magnetic disk devices was n + 2− (n−2) = 4, but after the completion of one cycle, the maximum difference in the rotational speed was n + 0.125− (n− 0.09375) = 0.21875, and the maximum difference in rotational speed is reduced. Therefore, it turns out that the rotation speed is averaged as a whole.

12A to 12K show the results of simulating the same operation as in FIG. The examples of FIGS. 12A to 12K are examples in which the number of magnetic disk devices is three (HDD1, HDD2, HDD3). FIG. 12A shows the sound pressure waveforms of the three magnetic disk devices in the upper row, and the lower row. Shows the synthesized wave (synthesized waveform) and the envelope of the synthesized waveform. Each of FIGS. 12B to 12K shows a synthesized wave (synthetic waveform) of sound pressure waveforms generated by three magnetic disk devices and an envelope of the synthesized waveform. The “envelope of the composite waveform” may be simply referred to as “envelope”. The circle at the top of each figure indicates the position of the envelope peak. The narrower the interval between adjacent circles, the smaller the envelope peak period, and the wider the envelope peak period, the greater the envelope peak period. Indicates. Note that the envelope peak period (also referred to as “envelope period”) is also referred to as the envelope peak interval.

FIG. 12A shows the initial state. First, the combination of HDD1 and HDD2 is set, the rotational speed of the magnetic disk of HDD1 is decreased, and the rotational speed of the magnetic disk of HDD2 is increased. As a result, as shown in FIG. 12B, the peak period of the envelope was shortened. Therefore, in this case, it is determined that the rotational speed difference between the HDD 1 and the HDD 2 is widened, that is, the reverse of the averaging, and the targets of increase and decrease of the rotational speed of the magnetic disks of the HDD 1 and HDD 2 are switched. Contrary to the above operation, the rotational speed of the magnetic disk of the HDD 1 is increased and the rotational speed of the HDD 2 is decreased. As a result, as shown in FIG. 12C, the period of the peak of the envelope spread compared with the state of FIG. 12A. Therefore, in this case, it is determined that the difference in rotational speed between the HDD 1 and the HDD 2 is narrowed, that is, averaged, the rotational speed of the magnetic disk of the HDD 1 is further increased, and the rotational speed of the HDD 2 is decreased. As a result, as shown in FIG. 12D, the envelope peak period further expanded from the state of FIG. 12C. Therefore, in this case, it is determined that the rotational speed difference between the HDD 1 and the HDD 2 is further narrowed, that is, further averaged, the rotational speed of the magnetic disk of the HDD 1 is further increased, and the rotational speed of the HDD 2 is decreased. As a result, as shown in FIG. 12E, the period of the peak of the envelope was shortened. Accordingly, in this case, it can be determined that the rotational speed difference between HDD1 and HDD2 has widened, it is determined that the optimum state has been passed, and it can be determined that the rotational speed difference between HDD1 and HDD2 has been reduced most in the state of FIG. Accordingly, in order to return to the state of FIG. 12D, the rotational speed of the magnetic disk of HDD1 is decreased and the rotational speed of HDD2 is decreased so as to cancel the increase in the rotational speed of the magnetic disk of HDD1 and the decrease in the rotational speed of HDD2 performed immediately before. Raised. Then, the rotation speed setting values determined as the optimum values of the HDD 1 and HDD 2 in that state were stored in the nonvolatile memory.

Next, the combination of the magnetic disk devices was changed, the combination of HDD2 and HDD3 was set, the rotational speed of the magnetic disk of HDD2 was increased, and the rotational speed of the magnetic disk of HDD3 was decreased. As a result, as shown in FIG. 12F, the period of the peak of the envelope expanded from the state of FIG. 12E. Therefore, in this case, it was determined that the difference in rotational speed between the HDD 2 and the HDD 3 was narrowed, and the rotational speed of the magnetic disk of the HDD 2 was further increased and the rotational speed of the HDD 3 was decreased. As a result, as shown in FIG. 12G, the period of the peak of the envelope further expanded from the state of FIG. 12F. Therefore, in this case, it was determined that the rotational speed difference between the HDD 2 and the HDD 3 was narrowed, and the rotational speed of the magnetic disk of the HDD 2 was further increased and the rotational speed of the HDD 3 was decreased. In this way, the same operation as in the case of the combination of HDD1 and HDD2 is performed, and the rotational speed setting values (determined to be optimum values) of HDD2 and HDD3 in the state where it is determined that the rotational speed difference between HDD2 and HDD3 is most reduced. Stored in non-volatile memory.

Next, the combination of HDD1 and HDD3 was set by further changing the combination of magnetic disk devices. In this case, the same operation as the combination of HDD1 and HDD2 is performed, and the rotational speed setting values of HDD1 and HDD3 in a state where it can be determined that the rotational speed difference between HDD1 and HDD3 is most reduced (FIG. 12H) (determined as the optimum value). Stored in a non-volatile memory. This completes all the combinations of the three magnetic disk units (HDD1-HDD2, HDD2-HDD3, HDD1-HDD3) (the end of the first cycle), so the process moves to the next cycle.

In the next cycle, as in the first cycle, first, a combination of HDD1 and HDD2 was set. Then, the same operation as the first cycle is performed, and the rotational speed setting values (determined to be optimum values) of HDD1 and HDD2 in a state where it can be determined that the rotational speed difference between HDD1 and HDD2 is most reduced (FIG. 12I) are stored in the nonvolatile memory. did.

Next, the combination of HDD2 and HDD3 was set. Then, the same operation as the first cycle is performed, and the rotational speed setting values (determined to be optimum values) of the HDD 2 and HDD 3 in a state where it can be determined that the rotational speed difference between the

HDDs

2 and 3 is most reduced (FIG. 12J). Stored.

Next, the combination of HDD1 and HDD3 was set. Then, the same operation as the first cycle is performed, and the rotational speed setting values (determined to be optimum values) of HDD1 and HDD3 in a state where it is possible to determine that the rotational speed difference between HDD1 and HDD3 is most reduced (FIG. 12K) Stored. This completes the second cycle.

When the waveform of FIG. 12K after the end of these two cycles is compared with the waveform of the initial state of FIG. 12A, the period of the peak of the envelope of the synthesized sound pressure waveform clearly extends, and the amplitude fluctuation of the synthesized sound pressure waveform It can be seen that the beat sound caused by is effectively reduced.

As shown in FIGS. 12A to 12K, a combination of two of the three magnetic disk devices is set, and the number of rotations of the combined two magnetic disks is set to the sound of the synthesized sound generated from the three disks. The pressure waveform is increased or decreased so that the peak period of the envelope is increased. Then, the operation of increasing / decreasing the rotational speed of the magnetic disk device is repeated while changing the combination of the two units sequentially. As a result, the period of the peak of the envelope of the sound pressure waveform of the synthesized sound of the sounds generated from the three units gradually increases, and as a result, it is possible to effectively reduce the beat sound due to the amplitude fluctuation of the sound pressure waveform of the synthesized sound.

Note that the adjustment operation described above with reference to FIGS. 9 to 12K is not limited to the initialization time when the power is turned on, but the information processing system of each of the first modification of the first embodiment and the first modification of the first embodiment and the second modification of the first embodiment. It can be implemented at any time during operation. In this case, as with the initialization time, it is desirable to prohibit the seek operation and eliminate noise caused by factors other than the spindle motor.

Also, the adjustment operation described above with reference to FIGS. 9 to 12K is preferably performed when no command is issued to a plurality of magnetic disk devices for a certain period of time. As a result, the influence on the performance of the information processing system can be reduced to the minimum.

Further, considering the case where the information processing system is turned off, after performing the adjustment operation described above with reference to FIGS. 9 to 12K, the rotation speed setting value of each magnetic disk device after adjustment is stored in the nonvolatile memory. ing. For this reason, when the information processing system is turned on again, the rotational speed setting value of each magnetic disk device stored in the nonvolatile memory is read, and the magnetic disk of the magnetic disk is matched with the read rotational speed setting value. The rotation speed is controlled. Therefore, the use is started in an optimum state.

Next, a third modification of the first embodiment will be described. In the third modification of the first embodiment, the sensor circuit 210 of the first embodiment is not a microphone but is a vibration sensor instead. In this case, the vibration sensor 210 detects the vibration of the housing (housing) or the pedestal (frame) of the information recording apparatus 200 that houses the plurality of magnetic disk devices HDD-1 to HDD-n. In the third modification, the analysis / control arbitration unit Ca0 detects the vibration waveform detected by the vibration sensor 210 instead of the sound pressure waveform. 9 to 12K, the combination of the two units is sequentially extracted from the plurality of magnetic disk devices HDD-1 to HDD-n as in the first embodiment by the adjustment operation described above. Then, every time a combination is extracted, an adjustment operation is performed to increase or decrease the rotation speeds of the two extracted magnetic disks so that the period of the peak of the detected envelope of the vibration waveform is extended. Thereafter, the rotational speed adjustment operation is sequentially repeated while changing the combination of the magnetic disk devices. As a result, the period of the peak of the envelope of the vibration waveform is gradually extended, and it is possible to effectively reduce the beat sound caused by the amplitude fluctuation of the vibration waveform.

Next, a fourth modification of the first embodiment will be described. The fourth modification of the first embodiment is a modification corresponding to the first modification of the first embodiment, has the configuration described above with reference to FIG. 4, and includes a vibration sensor 210 instead of the microphone 210. The vibration sensor 210 detects the vibration of the housing (housing) or pedestal (frame) of the information recording apparatus 200A that accommodates the plurality of magnetic disk devices HDD-1 to HDD-n. In the fourth modification, the operation by the analysis / control arbitration unit Ca1 is the same as the operation by the analysis / control arbitration unit Ca0 in the third modification.

Next, a fifth modification of the first embodiment will be described. A fifth modification of the first embodiment is a modification corresponding to the second modification of the first embodiment, has the configuration described above with reference to FIG. 5, and includes a vibration sensor 210 instead of the microphone 210. The vibration sensor 210 detects the vibration of the housing (housing) or pedestal (frame) of the host computer 100A that houses the plurality of magnetic disk devices HDD-1 to HDD-n. In the fifth modification, the operation by the analysis / control arbitration unit Ca0 is the same as the operation by the analysis / control arbitration unit Ca0 in the third modification of the first embodiment.

In each of the first embodiment and the first to fifth modifications of the first embodiment, the analysis / control arbitration unit Ca0 or Ca1 may be formed by an electronic circuit as hardware, or the CPU may It may be realized by executing a program. In the latter case, the function of the analysis / control arbitration unit can be realized by the CPU (Cph) executing the program stored in the memory Mmh in the configuration of FIG. 2B (Example 1).
In the configuration of FIG. 4, the CPU (Cp) (see FIG. 8) of the magnetic disk device HDD-1 executes the program stored in the memory Mm1, thereby realizing the function of the analysis / control arbitration unit. it can. In the configuration of FIG. 5, the function of the analysis / control arbitration unit can be realized by the CPU (Cpx) executing a program stored in the memory Mmx.

Next, an information processing system according to the second embodiment of the present invention will be described with reference to FIGS. As in the first embodiment, the information processing system according to the second embodiment includes a plurality of magnetic disk devices HDD-1 to HDD-n. In the design, it is assumed that the rated rotational speeds of the respective magnetic disks of the plurality of magnetic disk devices coincide with each other (for example, 7200 [rpm]).

In the second embodiment, a rotation speed signal (also referred to as a speed command signal) is transmitted from the host computer to each of the plurality of magnetic disk devices HDD-1 to HDD-n. Each of the plurality of magnetic disk devices HDD-1 to HDD-n receives the rotational speed signal and controls the rotational speed of its own magnetic disk so as to follow the rotational speed signal. The host computer automatically generates the rotation speed of the magnetic disk indicated by the rotation speed signal.

FIG. 13 is a block diagram illustrating a configuration of the information processing system according to the second embodiment. The information processing system according to the second embodiment includes a host computer 100X and an information recording device 200XA having a plurality of magnetic disk devices HDD-1 to HDD-n.

FIG. 14A is a block diagram showing a configuration of the magnetic disk device HDD-1 shown in FIG. 13, and FIG. 14B is a block diagram showing a configuration of the host computer 100X1. As shown in FIG. 14A, the magnetic disk device HDD-1 has a current control circuit Cc1 and a spindle motor Mo1. These current control circuit Cc1 and spindle motor Mo1 have the same configuration as the current control circuit Cc1 and spindle motor Mo1 of the magnetic disk device HDD-1 of the first embodiment described above with reference to FIG. 3A. The other magnetic disk devices HDD-2 to HDD-n have the same configuration as HDD-1 shown in FIG. 14A. In addition, each magnetic disk device has a function of outputting a signal specifying the rotational speed of its own magnetic disk to the host computer 100X1. A signal for specifying the rotation speed of its own magnetic disk can be a speed feedback signal (for example, an index signal) described later with reference to FIG. Each magnetic disk device has a function of controlling the rotation speed of its own magnetic disk based on a rotation speed signal (speed command signal in FIG. 17) transmitted from the host computer 100X1.

As shown in FIG. 14B, the host computer 100X1 includes a rotation speed signal analysis unit Ra0 and a rotation speed signal generation unit Sg0 in addition to the CPU (Cph) and the memory Mmh. The CPU (Cph) and the memory Mmh have the same configuration as the CPU (Cph) and the memory Mmh described above with reference to FIG. 2B. The rotation speed signal analysis unit Ra0 receives and analyzes a signal specifying the rotation speed transmitted from each magnetic disk device. The rotation speed signal generation unit Sg0 generates a rotation speed signal to be transmitted to each magnetic disk device according to the analysis result by the rotation speed signal analysis unit Ra0. The rotation speed signal analysis unit Ra0 and the rotation speed signal generation unit Sg0 may be provided in any one of the magnetic disk devices of the information recording device 200XA instead of being provided in the host computer 100X1. When the rotation speed signal analysis unit Ra0 and the rotation speed signal generation unit Sg0 are provided in the magnetic disk device HDD-1, the magnetic disk device HDD-1 functions as a master, and other magnetic disk devices together with the rotation speed of its own magnetic disk. The rotational speed of each magnetic disk of HDD-2 to HDD-n is also adjusted. The rotation speed signal analysis unit Ra0 and the rotation speed signal generation unit Sg0 may each be formed by an electronic circuit as hardware, or the CPU (Cph) of the host computer 100X1 executes a program stored in the memory Mmh. It may be realized by. The operation flow of the second embodiment will be described later with reference to FIG.

15A and 15B are block diagrams showing the configuration of the information processing system according to the first modification of the second embodiment. The first modification of the second embodiment differs from the second embodiment described above with reference to FIGS. 13, 14A, and 14B in that the operator (operator) determines the number of rotations of the magnetic disk of each magnetic disk device. is there. In this case, the host computer 100X2 includes a rotation speed signal generation unit Sg01 instead of the rotation speed signal generation unit Sg0 and the rotation speed signal analysis unit Ra0 in FIGS. 14A and 14B. The CPU (Cph) and the memory Mmh in the host computer X2 have the same configuration as the CPU (Cph) and the memory Mmh described above with reference to FIG. 2B. The rotation speed signal generation unit Sg01 generates a rotation speed signal indicating the input rotation speed according to the rotation speed of the magnetic disk input by the operator, and transmits it to each magnetic disk device. The operation flow of the first modification of the second embodiment will be described later with reference to FIG. The rotation speed signal generation unit Sg01 may be formed by an electronic circuit as hardware, or may be realized by the CPU (Cph) of the host computer 100X2 executing a program stored in the memory Mmh.

FIG. 16A is a block diagram illustrating a configuration of an information processing system according to the second modification of the second embodiment. In the second modification of the second embodiment, as in the second modification of the first embodiment described above with reference to FIG. 5, a plurality of magnetic disk devices HDD-1 to HDD-n are provided in the housing (housing) of the host computer 100XD. It has been. Further, the host computer 100XD according to the modified example 2 has a rotational speed signal having the same configuration as the rotational speed signal generation unit Sg0 and the rotational speed signal analysis unit Ra0 included in the host computer 100X1 of the second embodiment described above with reference to FIGS. 14A and 14B. A generation unit Sg0 and a rotation speed signal analysis unit Ra0 are included. The operations of the rotation speed signal generation unit Sg0 and the rotation speed signal analysis unit Ra0 are the same as those in the second embodiment described above with reference to FIGS. 13, 14A, and 14B. The operation flow of the second modification of the second embodiment will be described later with reference to FIG. The rotation speed signal generation unit Sg0 may be formed by an electronic circuit as hardware, or may be realized by executing a program stored in the memory Mmh by the CPU (Cph) of the host computer 100XD.

FIG. 16B is a block diagram illustrating a configuration of an information processing system according to the third modification of the second embodiment. In the third modification of the second embodiment, as in the second modification of the first embodiment described above with reference to FIG. 5, a plurality of magnetic disk devices HDD-1 to HDD-n are provided in the housing (housing) of the host computer 100XE. It has been. Further, the host computer 100XE of the third modified example has a rotational speed signal generating unit Sg01 having the same configuration as the rotational speed signal generating unit Sg01 of the host computer 100X2 of the first modified example of the second embodiment described above with reference to FIGS. 15A and 15B. Have The operation of the rotation speed signal generation unit Sg01 is the same as that in the first modification of the second embodiment described above with reference to FIGS. 15A and 15B. The operation flow of the third modification of the second embodiment will be described later with reference to FIG. The rotation speed signal generation unit Sg01 may be formed by an electronic circuit as hardware, or may be realized by executing a program stored in the memory Mmh by the CPU (Cph) of the host computer 100XE.

FIG. 17 is a block diagram illustrating a configuration example of a current control circuit of a magnetic disk device applicable to each of the second embodiment, the first modification of the second embodiment, the second modification of the second embodiment, and the third modification of the second embodiment. FIG. The current control circuit Cc in FIG. 17 has substantially the same configuration as the current control circuit Cc of the magnetic disk device described above with reference to FIG. In FIG. 17, the same components as those in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted.
The difference between the configuration of FIG. 17 and FIG. 6 is that a speed command signal generation circuit Ss is provided. The speed command signal generation circuit Ss generates a speed command signal indicating the fixed number of rotations and supplies it to the rotation speed detection circuit Rd. In the case of the configuration shown in FIG. 17, the speed command signal is also given as a rotational speed signal from the rotational speed signal generation unit Sg0 or Sg01. Here, when the speed command signal is simultaneously input from both the speed command signal generation circuit Ss and the rotation speed signal generation unit Sg0 or Sg01, the rotation speed detection circuit Rd receives the signal from the rotation speed signal generation unit Sg0 or Sg01. It has a switching function to select.

Thus, in each of the second embodiment, the first modification of the second embodiment, the second modification of the second embodiment, and the third modification of the second embodiment, unlike the first embodiment, the speed command signal is generated by the speed command signal. It is input from both the circuit Ss and the rotation speed signal generator Sg0 or Sg01. Further, the entire configuration of the magnetic disk device applicable in each of the second embodiment, the first modification of the second embodiment, the second modification of the second embodiment, and the third modification of the second embodiment is the magnetic disk described above with reference to FIG. It can be the same as that described as the apparatus.

Next, the flow of the adjustment operation in each of the second embodiment and the second modification of the second embodiment will be described with reference to FIG.
First, in the case of the second embodiment and the second modification of the second embodiment, the information processing system is turned on (step S31). As a result, each magnetic disk device is activated. First, in the configuration of FIG. 17, the rotation of each magnetic disk is controlled by the speed command signal generated by the speed command signal generation circuit Ss. Then, each magnetic disk device transmits a signal for specifying the rotational speed of the magnetic disk to the rotational speed signal analysis unit Ra0. The rotational speed signal analysis unit Ra0 receives a signal specifying the rotational speed of the magnetic disk from each magnetic disk device (step S32). The rotation speed signal analysis unit Ra0 determines the current rotation speed of each magnetic disk of each magnetic disk device from the received signal, and transmits the calculated rotation speed to the rotation speed signal generation unit Sg0.

When the rotational speed signal generator Sg0 receives the information on the rotational speeds of the respective magnetic disks from the rotational speed signal analyzer Ra0, the rotational speed signal generator Sg0 obtains the average of the rotational speeds of the magnetic disks of all the magnetic disk devices (step S33). The rotational speed signal generation unit Sg0 generates a rotational speed signal indicating the obtained average rotational speed, and transmits it to each magnetic disk device as a speed command signal (step S34).
When the rotational speed detection circuit Rd of the current control circuit Cc of each magnetic disk device receives the speed command signal from the rotational speed signal generation unit Sg0, it selects the speed command signal from the rotational speed signal generation unit Sg0 by the switching function. Transition to. As a result, the current control circuit Cc of each magnetic disk device indicates a speed command signal (rotational speed signal) indicating the average rotational speed of all the magnetic disk devices instead of the speed command signal from the speed command signal generation circuit Ss. It controls to rotate its own magnetic disk at the rotational speed (step S35).
As described above, according to the second embodiment and the second modification of the second embodiment, the speed command signal indicating the average rotation speed of the magnetic disks of all the magnetic disk apparatuses is transmitted from the rotation speed signal generation unit Sg0 to each magnetic disk apparatus. Sent. Each magnetic disk device controls the rotation of its own magnetic disk in accordance with the speed command signal. As described above, the rotation of the magnetic disk of each magnetic disk device is controlled by the speed command signal indicating the average number of rotations of all the magnetic disk devices.
Here, it is assumed that the rotational speed indicated by the speed command signal generated by the speed command signal generation circuit Ss of each of the plurality of magnetic disk devices has a deviation between the magnetic disk devices for some reason. In such a case, when the plurality of magnetic disk devices control the rotation of the magnetic disk by the speed command signal related to the generation of the speed command signal generation circuit Ss mounted on the magnetic disk device, the rotational speed deviation indicated by the speed command signal is shifted. Accordingly, a deviation occurs between the rotational speeds of the respective magnetic disks. Even in such a case, according to the second embodiment or the second modification of the second embodiment, each magnetic disk device is controlled by the speed command signal indicating the average rotation speed of each magnetic disk device. Therefore, each magnetic disk of the plurality of magnetic disk devices starts to rotate at a rotational speed that matches the average rotational speed of all the disk devices, and a beat sound due to the rotational speed deviation between the respective magnetic disk devices is generated. It can be effectively reduced.

The reason why the rotation speed indicated by the speed command signal for controlling each magnetic disk device is the average rotation speed of all the magnetic disk devices is as follows. If control is performed such that the rotational speed of any one of the plurality of magnetic disk devices HDD-1 to HDD-n is combined with the rotational speed of each of the other magnetic disk devices, the arbitrary one In the unlikely event that the magnetic disk device has a rotational speed that is extremely biased, it is assumed that each of the other magnetic disk devices cannot follow.

Next, the flow of the adjustment operation in each of the first modification of the second embodiment and the third modification of the second embodiment will be described with reference to FIG.

In the case of the first modification of the second embodiment and the third modification of the second embodiment, the information processing system is powered on (step S41), each magnetic disk device is activated, and the operator inputs the rotation speed of the magnetic disk. (Step S42). The rotation speed signal generation unit Sg01 calculates a period corresponding to the frequency indicating the rotation speed based on the input rotation speed of the magnetic disk (step S43). The rotation speed signal generation unit Sg01 generates a rotation speed signal having the calculated period and transmits it as a speed command signal to each magnetic disk device (step S34). When the rotational speed detection circuit Rd of the current control circuit Cc of each magnetic disk device receives a speed command signal indicating the rotational speed input by the operator from the rotational speed signal generator Sg01, the rotational speed signal generator Sg01 is switched by the switching function. Transitions to a state in which the speed command signal from is selected. As a result, the current control circuit Cc of each magnetic disk device has its own rotational speed indicated by the speed command signal indicating the rotational speed related to the input by the operator, instead of the speed command signal from the speed command signal generation circuit Ss. The magnetic disk is controlled to rotate (step S35).

As described above, according to the first modification of the second embodiment and the third modification of the second embodiment, the speed command signal indicating the rotation speed input by the operator is transmitted from the rotation speed signal generation unit Sg01 to each magnetic disk device. The Each magnetic disk device performs control to rotate its own magnetic disk at the rotational speed input by the operator. As a result, each magnetic disk device is controlled to rotate at the rotational speed input by the operator, so that the magnetic disks of the plurality of magnetic disk devices HDD-1 to HDD-n rotate at the same rotational speed. It becomes like this. Therefore, the beat sound due to the rotational speed deviation between the respective magnetic disk devices is effectively reduced.

100, 100A, 100XD,

100XE Host computer

200, 200A, 200XA Information recording device HDD-1 to HDD-n Magnetic disk device 210 Sensor circuit (microphone or vibration sensor)
Ca0, Ca1 Analysis / control arbitration unit Mm0, Mm1 Non-volatile memory Cc, Cc1 Current control circuit Mo1, Sm Spindle motor Say analysis unit Cay control arbitration unit Sg0, Sg01 Rotational speed signal generation unit Ra0 Rotational speed signal analysis circuit

Claims

A plurality of disk devices for recording and reproducing information; and
A detection unit for detecting sound or vibration of the plurality of disk devices;
The selection operation of selecting two of the plurality of disk devices and the selected 2 so that the period of the envelope of the sound or vibration waveform of the plurality of disk devices detected by the detection unit is extended. A control unit that performs an adjustment operation to increase the rotation speed of one disk device of a disk device and to decrease the rotation speed of the other disk device, and alternately repeats the selection operation and the adjustment operation. Information recording device.
In the selection operation, the plurality of disks are combined in a combination different from a combination of a first selection operation for sequentially selecting two different ones from the plurality of disk devices and a combination of the disk devices selected in the first selection operation. The information recording apparatus according to claim 1, further comprising: a second selection operation for sequentially selecting two different units from the apparatus.
In the adjustment operation, after the rotational speed of one of the two selected disk devices is increased and the rotational speed of the other disk device is decreased, the sound of the disk device detected by the detection unit is detected. Or determine whether the period of the envelope of the vibration waveform has been extended,
When the period of the envelope is extended, the rotational speed of the one disk device is further increased, and the rotational speed of the other disk device is further decreased, and then the sound of the disk device detected by the detection unit is detected. The information recording apparatus according to claim 1, wherein it is determined whether or not the period of the envelope of the vibration waveform has been extended.
In the adjustment operation, after the rotational speed of one of the two selected disk devices is increased and the rotational speed of the other disk device is decreased, the sound of the disk device detected by the detection unit is detected. Or determine whether the period of the envelope of the vibration waveform has been extended,
If the period of the envelope does not extend, the rotational speed of the other disk device is increased and the rotational speed of one disk device is decreased, and then the plurality of disk devices detected by the detection unit are detected. 2. The information recording apparatus according to claim 1, wherein it is determined whether or not the period of the envelope of the sound or vibration waveform has been extended.
A plurality of disk devices that rotate the disk at a rotational speed indicated by the speed command signal, and record and reproduce information on the disk;
A detection unit for detecting the number of rotations of each of the plurality of disk devices;
A control unit that obtains an average rotation speed of the plurality of disk devices detected by the detection unit, generates a speed command signal indicating the average rotation speed, and transmits the speed command signal to each of the plurality of disk devices; An information recording apparatus comprising:
An arithmetic device that performs an operation of information;
A plurality of disk devices for recording and reproducing information to be calculated by the calculation device;
A detection unit for detecting sound or vibration of the plurality of disk devices;
The selection operation for selecting two of the plurality of disk devices and the period of the envelope of the sound or vibration waveform of the plurality of disk devices detected by the detection unit are extended. An information processing apparatus comprising: a control unit that performs an adjustment operation of increasing a rotational speed of one disk device of the disk device and decreasing a rotational speed of the other disk device.
The selection operation includes a first selection operation for sequentially selecting two different devices from the plurality of disk devices, and a combination different from the combination of the two devices in the first selection operation from the plurality of disk devices. The information processing apparatus according to claim 6, further comprising: a second selection operation for sequentially selecting two different units.
In the adjusting operation, after the rotational speed of one of the two disk devices is increased and the rotational speed of the other disk device is decreased, the plurality of disk devices detected by the detection unit are detected. When the period of the envelope of the sound or vibration waveform is extended, the rotational speed of the one disk device is further increased with a smaller increase than the previous time, and the rotational speed of the other disk device is further increased from the previous time. Determines whether the period of the envelope of the sound or vibration waveform of the plurality of disk devices detected by the detection unit after being lowered with a small drop width has been extended. Further increasing the rotational speed of the disk device and further decreasing the rotational speed of the other disk device;
In the adjusting operation, after the rotational speed of one of the two disk devices is increased and the rotational speed of the other disk device is decreased, the plurality of disk devices detected by the detection unit are detected. When the period of the envelope of the sound or vibration waveform does not extend, the plurality of detected by the detection unit after increasing the number of rotations of the other disk device and decreasing the number of rotations of one disk device It is determined whether or not the period of the envelope of the sound or vibration waveform of the disk unit has been extended, and if so, the rotational speed of the other disk unit is further increased with a smaller increase range than the previous time. The cycle of the envelope of the sound or vibration waveforms of the plurality of disk devices detected by the detection unit is extended after the number of rotations of the one disk device is further lowered with a lower drop width than the previous time. 8. The information processing apparatus according to claim 6 or 7, wherein when it is extended, the rotation speed of the other disk device is further increased and the rotation speed of the one disk device is further decreased. .
A detection stage for detecting sound or vibration of a plurality of disk devices for recording and reproducing information; and
Determining an interval between peaks of the detected sound or vibration waveform envelope;
Increasing the rotational speed of one of the two disk devices selected from the plurality of disk devices and decreasing the rotational speed of the other disk device;
And a step of discriminating whether or not the interval between the peaks of the envelope has increased as a result of increasing or decreasing the rotational speed of the two selected disk devices.
The selection operation includes a first selection operation for sequentially selecting two different devices from the plurality of disk devices, and a combination different from the combination of the two devices in the first selection operation from the plurality of disk devices. The disk device control method according to claim 9, further comprising a second selection operation of sequentially selecting two different units.
After increasing the rotational speed of one of the two disk devices and decreasing the rotational speed of the other disk device, the peak interval of the envelope of the sound or vibration waveform of the disk device is extended. In this case, the rotational speed of the one disk device is further increased, while the rotational speed of the other disk device is further decreased,
After increasing the rotational speed of one of the two disk devices and decreasing the rotational speed of the other disk device, the peak interval of the envelope of the sound or vibration waveform of the disk device is extended. 11. The disk device control method according to claim 9, wherein when there is no disk device, the rotational speed of the other disk device is increased and the rotational speed of the one disk device is decreased.
A detection step of rotating the disk at the number of revolutions indicated by the speed command signal and detecting the number of revolutions of each of a plurality of disk devices for recording and reproducing information on the disk;
A control step of obtaining an average of the rotation speeds of the plurality of disk devices detected in the detection step, generating a speed command signal indicating the average rotation speed, and transmitting the speed command signal to each of the plurality of disk devices; A method for controlling a disk device, comprising:
The selection operation of selecting two of the plurality of disk devices from the computer, and the sound or vibration waveforms of the plurality of disk devices detected by the detecting means for detecting the sound or vibration of the plurality of disk devices An adjustment operation is performed to increase the rotation speed of one of the two disk devices and decrease the rotation speed of the other disk device so that the period of the envelope of the two disk devices increases, and the selection operation and the adjustment operation are alternately performed. A control program for the disk device for functioning as a repeating control means.
The selection operation includes a first selection operation for sequentially selecting two different devices from the plurality of disk devices, and a combination different from the combination of the two devices in the first selection operation from the plurality of disk devices. 14. The control program for a disk device according to claim 13, further comprising a second selection operation for selecting two different units sequentially.
In the adjusting operation, after the rotational speed of one of the two disk devices is increased and the rotational speed of the other disk device is decreased, the plurality of disk devices detected by the detecting means are detected. When the period of the envelope of the sound or vibration waveform is extended, the rotational speed of the one disk device is further increased with a smaller increase than the previous time, and the rotational speed of the other disk device is further increased from the previous time. Determines whether the period of the envelope of the sound or vibration waveform of the plurality of disk devices detected by the detecting means after being lowered with a small drop width has been extended. Further increasing the rotational speed of the disk device and further decreasing the rotational speed of the other disk device;
In the adjusting operation, after the rotational speed of one of the two disk devices is increased and the rotational speed of the other disk device is decreased, the plurality of disk devices detected by the detecting means are detected. When the period of the envelope of the sound or vibration waveform does not extend, the plurality of detected by the detecting means after increasing the number of rotations of the other disk device and decreasing the number of rotations of one disk device It is determined whether or not the period of the envelope of the sound or vibration waveform of the disk unit has been extended, and if so, the rotational speed of the other disk unit is further increased with a smaller increase range than the previous time. The cycle of the envelope of the sound or vibration waveforms of the plurality of disk devices detected by the detection means after the rotational speed of the one disk device is further lowered with a lower drop width than the previous time. 15. The disk according to claim 13 or 14, wherein, when the disk is extended, the rotational speed of the other disk device is further increased and the rotational speed of the one disk device is further decreased. Device control program.
The computer calculates an average of the rotational speeds of the plurality of disk devices detected by the detecting means for detecting the rotational speeds of the plurality of disk devices, and generates a speed command signal indicating the average rotational speed. And a control program for the disk device for causing the disk device to function as control means for transmission to each of the plurality of disk devices.