JPH03141073A - Data processor - Google Patents

Abstract

PURPOSE:To actuate the other device even at the time when a fault is generated in the magnetic disk device by setting an identification number to each disk device, respectively, and setting the waiting time for a spindle motor correspond ing to the identification number. CONSTITUTION:To each of drives 22a, 22b... of each disk device, a desired recognition number is set in advance by a built-in switch 32, and when a common power sequence signal PS is supplied from a host computer 21, a waiting time for a spindle motor corresponding to the set recognition number is set to a timer circuit 31. Subsequently, after the set waiting time, start-up of the spindle motor 34 is controlled through a motor driving circuit 33. Accordingly, being different from the case when the spindle motor is started successively by a sequential signal, even in the case a fault is generated in some magnetic disk device, it does to occur that subsequent start-up of the magnetic disk device cannot be executed and when a set timer time elapses, all the magnetic disk devices except a fault magnetic disk device can be actuated, and also, the set waiting time can easily be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a data processing apparatus in which a plurality of magnetic disk drives are connected to one host computer by, for example, a daisy chain connection.

(Prior Art) As shown in FIG. 4, one host computer 11 includes a plurality of magnetic disk devices (hereinafter referred to as drives) 1
In a data processing apparatus in which drives 12a, 12b, . . . are connected in a daisy chain, it is necessary to avoid simultaneous activation of the spindle motors (not shown) of each drive 12a, 12b, .

Therefore, conventionally, the power sequence signal PS (signal for starting the spindle motor) issued from the host computer 11 is connected to each drive 12a, 12b, etc. using relay circuits lea, 13b, etc. It was.

In such a configuration, the drive 12a closest to the host computer H starts the spindle motor upon receiving the power sequence signal PS, and turns on the relay circuit 13a when the motor reaches steady rotation. Then, the power sequence signal PS is sent to the next drive 12b. The drive 12b that receives this power sequence signal PS performs the same processing as described above and further sends the power sequence signal PS to the next drive. In this way, the power sequence signal PS is transmitted to the relay circuit 11a 5
13b... to each drive 12a.

The spindle motors 12b... are sequentially activated.

Each drive Ha in such a configuration.

12b... is shown in FIG. As shown in FIG. 5, the firmware processes include monitoring the power sequence signal PS (step A1), starting the spindle motor (step A2), monitoring the motor rotation speed (step 83), and starting the relay (step A1). A4).

(Problems to be Solved by the Invention) As described above, conventionally, in order to avoid simultaneous activation of motors, a power sequence signal has been connected to each magnetic disk device by a relay. However, this method has the problem that when a failure occurs in a certain magnetic disk drive, the power sequence signal is not transmitted to the succeeding magnetic disk drive, and other spindle motors are also not started. There is also the problem that the motor starting order is fixed for each magnetic disk device, and the order cannot be set arbitrarily.

The present invention has been made in view of the above points.In a data processing system in which a plurality of magnetic disk drives are connected to one host computer, even if one magnetic disk drive fails, the other magnetic disk drives It is an object of the present invention to provide a data processing device that can start motors without affecting a disk device and can arbitrarily set the motor starting order.

[Structure of the Invention] (Means for Solving the Problems) That is, the data processing device according to the present invention is provided with an identification number setting means for setting an identification number unique to the device in each magnetic disk device, By inputting the motor start signal, a time period corresponding to the identification number set by the identification number setting means is set, and the spindle motor is started after the time period has elapsed.

(Function) According to the above configuration, each magnetic disk device starts its motor with a time period corresponding to the device's unique identification number. Therefore, the motor can be started without affecting other magnetic disk devices, and by changing the identification number,
The motor starting order can be set arbitrarily.

(Embodiment) Hereinafter, a data processing device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing its configuration, in which one host computer 21 has multiple magnetic disk devices (hereinafter referred to as
(referred to as drives) 22a, 22b, . . . are connected so as to simultaneously supply a power sequence signal PS. The power sequence signal PS is a signal issued from the host computer 21 to start the spindle motor. As shown in FIG. 2, each drive 22a, 22b, . . . has a timer circuit 31. Switch 32, motor drive circuit 33, spindle motor 34
It is equipped with

The timer circuit 31 sets a duration T according to a unit number (equipment number) N using the power sequence signal PS. The switch 32 is a switch for setting the unit number N from the outside. This switch 32 is, for example, a 4-bit deep switch. The motor drive circuit 33 starts the spindle motor 34 after a time period T set by the timer circuit 31. The spindle motor 34 is a motor that rotates a recording medium (disc) not shown.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

A power sequence signal PS issued from the host computer 21 is simultaneously supplied to each drive 22a, 22b, . . . . Here, each drive 22a122b...
- A unique unit number (device number) N is set for each drive in advance through the switch 32.

Each drive 22a, 22b... monitors the power sequence signal PS from the host computer 21 (step B1), and when the signal PS is input, it reads the unit number N set by the switch 32, and reads this value. is set in the timer circuit 31 (step B2
). The timer circuit 31 sets a holding time T by multiplying this unit number/(-N by a predetermined time t (step B3). Note that the above time t is a period of steady rotation after the spindle motor 34 is started. This is the standard time required to reach .

When the holding time T is thus set, the timer 4-way 31 starts the spindle motor 34 through the motor drive circuit 33 after the holding time T (step B4).

In this way, the duration time T is set for each of the drives 22g, 22b, . . . , and the spindle motors 34 of the drives 22a, 22b, . Therefore, even if a failure occurs in a certain drive, the spindle motors of the other drives are activated with a time period T specific to each drive.

Furthermore, since the duration T can be freely changed through the switch 32, which is a dip switch, for example, each drive 22
The starting order of the motors a, 22b, . . . can be arbitrarily set.

[Effects of the Invention] As described above, according to the present invention, in a data processing device in which a plurality of magnetic disk devices are connected to one host computer, each magnetic disk device spins independently with its own unique time. The motor can be started. Therefore, even if a failure occurs in a certain magnetic disk device, the motor can be started without affecting other magnetic disk devices. Furthermore, by changing the duration, the motor starting order can be arbitrarily set.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the drive shown in FIG. 1, and FIG. 3 is a block diagram for explaining the operation of the embodiment. FIG. 4 is a block diagram showing a conventional configuration, and FIG. 5 is a flow chart for explaining the conventional operation. 21...Host computer, 22as 22b...
- Drive, 31...Timer circuit, 32...Switch, 33...Motor drive circuit, 34...Spindle motor. Figure 1

Claims (1)

[Scope of Claims] In a data processing device in which a plurality of magnetic disk devices are connected to one host computer, an identification number setting means for setting a device-specific identification number to each magnetic disk device, and the host computer a motor for rotating the recording medium; a motor for rotating the recording medium; and motor starting means for starting the motor after a waiting period has elapsed.