JPS6074018A - Input and output control system - Google Patents

Abstract

PURPOSE:To improve the efficiency of a system by providing an emulation buffer that plural input/output controllers can share with each other. CONSTITUTION:Two input/output control parts 13a and 13b of systems A and B are provided in a host computer 10. Those input/output control parts 13a and 13b operate according to a command CDK from the CPU in the computer 10. A magnetic disk 20, on the other hand, has a disk control part 23 and a disk 22 on which data are stored, sector by sector, and th emulation buffer 24 is provided in the disk control part 23. Data sent out of the input/output control parts 13a and 13b are stored in the emulation buffer 24 temporarily and those stored data are written on the disk 22, sector by sector, through the operation of a disk control part 21. The data from the disk 22 are converted into CKD format on the basis of commands from the input/output control parts 13a and 13b and sent out to the input/output control parts 13a and 13b.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to an input/output device such as a magnetic disk device having a recording medium that records data according to a predetermined array format, and an upper processing device such as a computer. This invention relates to a human output control system between devices.

(b) Technical background In an input/output device in this type of system, such as a magnetic disk device, the data arrangement format (format) recorded on each trunk of the disk serving as the recording medium is the first The one shown in the above (hereinafter referred to as the CKD format) is common.

This indicates the starting point and ending point on the trunk. After the index, the shilling number, trunk number, etc. of the trunk are recorded. A record RO consisting of a callan ziRc to be used and a data part is arranged.

Furthermore, records R1, R2, etc., which the user can directly record, are sequentially arranged after this record RO. Each of these records R1, R2, etc. is composed of a callan I/part C, a key part K, and a data part, and the count part C contains the following information along with ■D information used for searching the record. The number of bytes (KL, DL) of the data part is recorded in the key part following the key part, and the key information of the number of bytes (KL) specified by the count part C is recorded in the key part K. Further, data of the number (DL) designated by the count section C is recorded in the data section.

In addition, the home address (HA) and each record RO, R
The count section C, the key section K, and the data section of 1... are the addition information ECG for detecting errors in reading each information.
have.

In the magnetic disk drive using the CKD format, the data length (DL) of the data that can be used by the user is arbitrary. It gets complicated.

On the other hand, in order to simplify internal control as much as possible, especially for magnetic disk drives used in small-scale systems, the data array format of the disk is further simplified, as shown in Figure 2, for example. The following format (hereinafter referred to as sector format) is used.

This means that blocks of fixed length are arranged after the index indicating the start point (end point) of the track, and each block B
O1Bl, B2, etc. are composed of an address part A that records information used for block search, and a data part A that records data related to ghosts. ) is constant, unlike in the case of the CKD format.

Incidentally, the above-mentioned sector format magnetic disk devices are used especially in small-scale systems, but the number of data storage devices on sector format disks has increased in recent years, and magnetic disk devices with outgoing disks have become more popular in recent years. Consideration was being given to applying the device to even larger scale systems.

-On the other hand, in relatively large-scale systems, CKD is generally
The data processing format (software) of a higher-level processing device such as an AI machine (computer) that controls the magnetic disk device also follows the CKD format. Therefore,
The computer used in this relatively large-scale system J cannot directly control the sector-type magnetic disk device due to the difference in its data processing formant (software) and the data arrangement format of the disk J2.

Therefore, if you try to control a sector-type magnetic disk device in a relatively large-scale system, you will have to develop new software for the upper processing unit of the system, but it is not possible to develop new software. Since there are problems such as extremely high development costs, it is necessary to maintain the computer software in accordance with the proven CKD format and to be able to control sector format magnetic disk devices (without changing the usability for users). was requested.

:c) Prior art and problems A conventional system is shown in Fig. 3 as a system that can control a magnetic disk device having a sector format disk using a data processing formant (software) according to the GKD format. There is something like that.

In the same figure, 10 is the old Q machine that is equipped with 1-1 rank, 20
is a magnetic tisf device controlled by a 51'n machine lO. Here, the 1.41 computer 10 has a CPU 11 that performs data processing using a data processing formant (software) that follows the CKD format, and a memory 12 that serves as a main storage device.
and a human output control unit 13 that directly controls the magnetic tisf device 20 according to commands from the CPU l l.
Furthermore, this input/output control unit 13 receives l+ from the CPU II.
Write data and 1 from the magnetic disk device 20 side;)
It has an emulation 7/< buffer for temporarily storing extrusion data. On the other hand, the magnetic disk device 20 includes a disk controller 21 and a disk 22 on which data is recorded in sector format. , the data sent from the input/output control unit 13 is transferred to the disk 2.
2, read data from the disk 22'' and send the data to the human output control section 13.

In such a system, data is read into and read from the disk 22 as follows (see FIG. 4).

First, in the case of writing, data according to the GK[] format from CPU l1 is output along with the write command.
Under the control of the input/output control section 13, the 14 emulation amplifiers send the home address (mouth A), record 1;'RO (count section C, data section D) in order from a predetermined address.
, record R1 (count section C, key section K, data section D
), etc. At this time, in response to a command from the input/output control section 13, the disk control section 21 selects a predetermined trunk of the disk 22, and stores the emulation buffer 14 in the data section of each block BO, Bl... on the relevant HA l/rack. The data stored in the block B (1, 81...
Data corresponding to the redundant data length (/Hayde number) will be written from the emulation buffer 14 to the data section of the record F'RI stored in the emulation buffer 14. As such, it may be written across block B1 and block B2.

In addition, in the case of reading, the disk control unit 21 selects a predetermined trunk of the disk 22 according to a command from the human output control unit 13 based on a read command from the CPIIll, and outputs the data written as described above to the blog BO. The data is sent to the control unit 13, and the takes are sequentially stored in the emulation buffer 14. Then, the input/output control 113- sequentially searches the data in the buffer 14 to the emulation node, and sends the necessary data (data of each record) to the CPU I based on the read command from the CPU 1.
Send to I.

In this way, if the emulation buffer 14 is used, data processing format I/(
The AL calculator 10, which operates according to software), can control the sector-type magnetic disk device 20 as if it were a CKD-type magnetic disk device. Then, after the GPUI+ has read out the data on the disk 22 to the emulator 14, in order to use the rotation data on the disk 22 again, without accessing the disk 22, Direct emulation buffer 1
The emulation buffer 14 can also be provided with a so-called cache function, thereby improving data processing efficiency.

Incidentally, in recent years, in systems in which input/output devices such as magnetic disk drives are controlled by host processing units, for example, two or more inputs are installed in the processing unit for the purposes of improving system reliability and processing efficiency. A method (device cross-call method) in which an output control section is provided and each input/output control section independently controls the input/output device is being adopted. Specifically, when this method is adopted in a system for controlling the conventional magnetic disk device 20, the human output control section 13 for destroying the emulation buffer 14 as shown in FIG. A plurality of units are provided within the CPLI II, and each output control unit 13 or the magnetic disk device 20 is independently controlled by the command from the CPLI II.
It is possible to control the

However, if a device cross-call method is simply adopted in a conventional system like this, each prefecture (each input/output control unit - magnetic disk device) will have to independently read and write data via their respective emulation buffers 714. Therefore, if each prefecture updates the contents of disk 2 in another system, it cannot confirm the update and cannot always use the data in the emulation buffer 14 of its own system as the contents on the disk. Can not. In other words, it becomes impossible to provide the emulation buffer 14 in each prefecture with a so-called cache function.

As a result, in order to provide the emulation buffer 14 of each prefecture with a cache function and to effectively use the contents of this emulation/hennoa 14, it is necessary to check the disk update status between the human output control sections 1r of each prefecture. There was a problem in that the system configuration had to be configured such that it could be monitored at any time, making the system configuration complicated.

In addition, for example, a magnetic tram, a magnetic bubble memory, etc. are used as a recording medium other than the system that controls the magnetic disk device, and an emulation system is installed in the same manner as described in 1. A similar problem will occur if the device cross-call method is adopted in a system that uses a data processing format that is different from the data arrangement format on the recording medium.

(d) Object of the Invention The present invention has been made in view of the above, and uses an input/output device having a recording medium for recording data according to a predetermined array format using emulation/Hesofa. When a device cross-call method is adopted for a system controlled by a data processing format different from the data array format of the medium, the contents of the emulation puff 7γ can be used effectively in a more efficient configuration. The purpose is to provide an input/output control system.

(e) Describing the structure of the invention In order to achieve the object, the present invention provides an input/output device having a recording medium for recording data according to a predetermined arrangement format, and an input/output device connected to the input/output device in the processing device. In a system having a plurality of input/output control means for controlling data writing to a recording medium in an input/output device and data reading from the recording medium according to a data processing format in the upper processing device, each input/output Data written from the control means to the recording medium and read data from the recording medium to each input/output control stage are temporarily stored, and the stored data is stored in the recording medium or each input/output control means in its respective format. An emulation pamphlet 7 that enables the transfer of information is also provided on the output device side.

(f) Examples of the invention Embodiments of the present invention will be described below based on the drawings.

FIG. 5 is a block diagram showing one embodiment of the present invention. In the figure, numeral 10 is a counter machine serving as a J-san processing device, as in the case shown in Fig. 3, and this dew-1 computing machine 10 serves as an input/output control section for a system 2 (A system 2-day system) 13a. , 13b. The input/output control sections 13a and 13b operate independently according to commands (according to the GKD format) from the CPU in the total Q machine 10.

On the other hand, 20 is a magnetic disk device, and this magnetic disk device 20 has a disk control unit 23 and a disk 22 that stores data in sector format.Furthermore, the disk control unit 23 is shown in FIG. The emulation amplifier 24 has an emulation amplifier 24 as shown in FIG. The AI calculator's individual output control units 13a and +3b are operated independently.

Controls the disk control unit 23, and each individual output control unit 13a,
The data sent from +3b is temporarily emulated/
By the operation of the disk control section 21, the stored data is written to the disk 22 in a sector format. The data read from the disk 22 is also stored in the temporary emulation buffer 24, and the stored data is sent to each input/output control unit +3a or 13b according to the CKD format.

That is, each person's output control section +3a, '1 in the calculation machine 10
3b is a 4W converter that uses the emulation eight buffer 24 in the magnetic disk device 20.

Here, an example of a specific configuration of the disk control unit 23 including the emulator/fender 24 will be described with reference to FIG.

In the figure, the A system is the human output control section +3 in Figure 5.
The system connecting a and the disk control unit 23, the B system, is the human output control unit +3b in FIG. 5 and the disk control unit 4.
This is a system connected to klIO1123, and is an individual output control unit 13a in each prefecture.

The connection between +3b and the disk control unit 23 is as follows. ■d
3), Data I., S■@. 31
is a gate circuit in the A system, and this gate circuit 31
is the device selection signal from the human output control unit +3a (when No. 1i is "θ'")
1”) are the device selection lines ■ and G) Gl, G2.G
3, and the state is set as the permissible state.

32 is a gate circuit in the B system, and this gate circuit 32 also receives the device selection signal from the input/output control unit 13b when the device selection signal in the A system is "0", as in the case of the A system. ("l-" is input through the device selection line ■ and the gate 1-04. At this time, the device selection line (W) and the device use signal ("1") via the gate GIJ2 are further connected to the device selection enable signal ("1") as the device selection enable signal.
At the same time, the device selection signal is input to the input/output control section +3b via the B-system device-in-use notification line j) as a device in use 4f1. On the other hand, the gate circuit 32
When is in the blank state, the device selection signal (1'') via the device selection line ■ and gates GA and G5 is further sent as a device selection enable signal to the input/output control section 13b via the device selection enable line Lφ. At the same time as the manual input, the chair selection signal is input as a device use signal to the input/output control unit 13a via the A-system device-in-use notification line (■.33 is the A-system command/ Hess delivery), command valid line ■ and B system data bus (0), command valid line 0
) are decoders connected via gate circuits 31 and 32, respectively, and are activated by the command valid signal ("1") inputted via each command valid line @) or [phase], and the decoder, IS Output is each instruction/hess ■ or 0
Based on the manual instructions through the emulation machine,
Reading and writing of the buffer 24; - Data storage from the emulation buffer 24 to the disk 22 and data loading from the disk 22 to the emulation buffer 24, presence or absence of seek operation, reading and writing of the trunk address register 35 register 36, which will be described later. This is the output of each command. , 34 are read signals from the decoder 33.
Based on the write command output, data on the data bus +i+ or @] is written to the emulation header 24 via the gate circuit 31 or 32, and data in the emulation header 24 is read out. The execution-1/write 1φj path 35 loads the data on the disk 22J into the emulation buffer 24 based on the rotary store command output from the decoder 33, and also loads the data in the emulation buffer 24 onto the disk. It is a load/switch I/A circuit that stores on 22,
The read/write I circuit 34 handles data in CKD format, while the load/write circuit 35 handles data in sector format.

In addition, in 3G, a flag 1/sister 37 stores a flag indicating whether or not the data on the disk 22 is written in the emulator 24. The flag register 36 is a trunk address register that stores the link number data.
Each trunk address register 37 has a decoder 33
Based on the output of the write command, writing of track number data on the data bus (1) or (@) and sending of data to the data bus is performed. 38 is a seek circuit which is activated by the seek command output from the decoder 33 and sends the magnetic hent of the read and Q input rivers to the I/U and RI of the disk specified by the data in the trunk address register 37. be.

Next, the operation of the system will be explained.

First, for example, when writing data in system A,
If the input/output control section +3a outputs a device selection signal, and at this time the device selection signal is not output from the input/output control section +3b in the B system, the gate circuit 31 enters the allowable state and the device selection valid line The input/output control unit +3a confirms the valid state of the A system and the invalid state of the B system via the device (1) and the device-in-use notification line (2).

Here, the input/output control unit +3a sends an instruction valid signal (hereinafter, this instruction valid signal is outputted every time instruction information is output via D) to the emulation buffer 2.
When the FJ 3 write command and the corresponding write data are sent to the FJ 4, the read/write circuit 34 enters the write state due to the data write command output from the decoder 33, and the data of the data head) 1- is transferred to l1ff+ next emulator [/- The data is written to the version buffer 24.

At this time, data is written in the CKD format from a predetermined address to the emulation pants γ24 as shown in FIG. Next, the crowd control unit 13a controls the disk 221-
1) Output a write command to the trunk number data to be written and the data to the trunk address register 37;
Track number data to be written is stored in the trunk address register 37 by the track address write I command output from the decoder 33. Then, a seek command is issued and the seek command output from the decoder 33 causes
A seek circuit 38 positions the magnetic head on the relevant track on the disk 22 based on the data in the trunk address register 37. When the seek operation is completed in this way, the input/output control section 13. A store command is issued from a, and a store command signal from the decoder 33 causes the load/
The store circuit 35 enters the store state, and the data in the emulation 24 is sequentially written to the designated track on the disk. At this time, as shown in FIG. 4, data is written on the trunk in sector format. Further, when this data writing is completed, a flag write command is issued, and a flag indicating the valid 3R state fa of the emulation amplifier 24 is written into the flag register 36 by the flag write command of the decoder 33.

1+A, l+ 1 :+1 A C, l--f 4tl
Buttocks '+I A child' fil l-, F -h 4
To explain the operation when reading in the B system, first, the input/output control unit 13b outputs a device selection signal, and at this time, if the A system is valid as before, each game 1
-04. G5. G6 is in a prohibited state and the Japanese system is not valid, but if the device selection signal output from the input/output control unit +3a stops J1 in the A system, the gate circuit 32
becomes the permissible state, and the human output control unit +3b checks the valid state of the B system and the invalid state of the A system via the device selection valid line (■) and the device-in-use notification line (rono).

Here, the human output control unit 13b outputs an instruction valid value (hereinafter referred to as 1, this instruction valid signal is output every time the instruction information is output via the instruction path IJ+)) and the flag register 36 and the trunk. The address register coder 33 outputs Flagley-1 command and I-Rack address read command for each "/Jimeta3[
The contents of 1 and 37 are taken into the input/output control unit 13b via the data bus Q, and according to a command from the CPU, the track number on the disk 22 in which the data to be read is recorded is read as described above. Track address data match confirmation and emulation buffer 24
The input/output control F+fl13b issues a command to read data in the emulation buffer 24 (7). Then, the data read command output from the decoder 33 based on the command causes the read/write circuit 3 to
4 is lead-like fm and nari, emulation/hetsufu 7
The data in 24 is input to the input control unit +3 via the data bus @.
(CKD format).

As described above, according to this embodiment, the data written in the emulation buffer 24 in the A system can be used as is in the B system, and especially in the input/output control unit +3a, 13b phase, the emulation buffer 24 is Even with a configuration in which the usage note 8 is not checked, the so-called cache function of the emulation buffer 24 can be maintained.

Note that the emulation buffer 24. Flag register 3
6. A plurality of track address registers 37 may be provided corresponding to a plurality of tracks. And if you increase that number,
The cache function can be used more effectively.

Further, in this embodiment, a magnetic disk device has been described as an input/output device, but the present invention is not limited to this; System configuration is possible.

(g) Effects of the Invention As explained above, according to the present invention, an input/output device having a distribution medium for recording data in a predetermined array format can be recorded using an emulation buffer. Recording IL (Data Arrangement and Data Processing in 4) If the device cross-call method is adopted for a system controlled by Forman 1, check the usage status of emulation buff 7a in the mutual system that cross-calls. The contents of the emulation buffer can be used effectively even if the emulation buffer is not configured accordingly.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the CIO format data arrangement on the disk, Fig. 2 is an explanatory diagram showing the sector arrangement on the disc, and Fig. 3 is an explanatory diagram showing the data processing format according to the CKD format. FIG. 4 is an explanatory diagram showing the state of reading and writing data via an emulation buffer, and FIG. 5 shows an embodiment of the present invention. The program diagram shown in FIG. 6 is a block diagram showing a specific example of the disk control section 23 shown in FIG. 10... Computers 13a, 13b... Input/output control section 20... Magnetic disk device 22... Disk 23... Disk control section 24... Emulation pants 7 31, 32... Gate circuit 33 ... Decoder 34 ... Read/write circuit 35 ... Load/store circuit 36 ... Flag register 37 ... Track address register 38 ... Seek circuit

Claims (1)

[Claims] An input/output device having a recording medium for recording data in accordance with a predetermined array format, and a processing device that connects the input/output device to write data to the recording medium in the input/output device and record the data. In a system having a plurality of input/output control means for controlling the reading of data from a medium according to the data processing format in the three-stage processing device, each input/output control means controls the writing of data from the control means to the recording medium. and an emulation pamphlet that stores -114j read data from the recording medium to the individual output control means and allows the stored data to be transferred to the recording medium or the individual output control means in respective formats,
A human output control system characterized by being provided on the input/output device side.