JPS63223822A - Control system for disk device - Google Patents

Abstract

PURPOSE:To shorten the waiting time for transfer of data by setting an adaptor containing a data buffer between a single controller and plural disk devices and performing the transfer of data in parallel with each other between an adaptor and said disk devices. CONSTITUTION:A disk control adaptor containing a data buffer part 55 including the data memory areas corresponding to disk devices 6(1)-6(n) is set between a disk controller 4(1) and these devices 6(1)-6(n) which are controlled by the device 4(1). In a reading mode the disk device 6(2) transfers data to a data buffer 55b when an interruption is given from the device 6(2) while the devices 6(1) is transferring data to the device 4(1). The transfer of data is interrupted to the device 4(1) while data are transferred to the buffer 55b. Then the data are transferred to the device 4(1) from the buffer 55b.

Description

[Detailed Description of the Invention] [Summary] This is a control method for disk-type storage devices, in which when multiple disk devices are controlled by one control device, data transfer is delayed due to contention, and when these devices are configured In order to solve the problem of performance degradation of the data processing subsystem, an adapter having a data buffer with a data storage area corresponding to the plurality of disk devices is provided between the control device and the plurality of disk devices. By configuring data transfer between two disk devices to be processed in parallel, it is possible to prevent performance degradation of the data processing subsystem.

[Industrial application field]

The present invention relates to a data processing subsystem that performs read/write processing of data to a plurality of disk devices under its control in accordance with a command from a host device, and particularly relates to a control method for a plurality of disk devices.

For example, in a data processing subsystem using a magnetic disk device as a storage device, a plurality of magnetic disk devices are usually connected to one magnetic disk control device via disk control adapters.

In this case, although it is possible to control a plurality of magnetic disk devices by one disk control device, contention between the plurality of magnetic disk devices may occur, resulting in data transfer delays.

It is desired to put into practical use a method by which data transfer in such cases can be efficiently processed in a shorter time with a simple configuration.

[Conventional technology]

FIG. 5 is a diagram for explaining a conventional example, FIG. 6 is a diagram for explaining a disk control adapter in the conventional example, and FIG. 7 is a diagram for explaining a data transfer time chart in the conventional example.

FIG. 5 shows an overview of the data processing subsystem, and its configuration includes a central processing unit (hereinafter referred to as CPU) 1 that controls the data processing subsystem, and a main storage device 2 that serves as the main memory of the CPU10 in the data processing subsystem. , a channel device 3 forming a channel for a plurality of disk devices 6(1) to 6(8) connected to the data processing subsystem, and disk devices 6(1) to 6(1) to 6(8) under the control of the plurality of disk devices 6(1) to 6(8) connected to the data processing subsystem. disk control devices 4(1) and 4(2) that perform read/write processing control for 6(8);
It is located between the disk control devices 4 (1), 4 (2) and the disk devices 6 (1) to 6 (8), and performs direct/parallel conversion of data transferred during read/write processing and addition of error check bits. and disk control adapters 5(1) and 5(2) that perform error checking, and a disk device 6 that executes data read/write processing under the control of disk control devices 4(1) and 4(2). (1)-6(8
).

Note that the disk control adapter 5 (IL 5(2) is an MPII 5 that controls its internal processing operations, as shown in FIG.
1, an interface section 52.54 that interfaces with the disk control devices 4 (1), 4 (2) and disk devices 6 (1) to 6 (8), and disk devices 6 (1) to 6 (8). The data to be transferred to the disk controllers 4 (1) and 4 (2) is converted to serial data and an ECC bit is added to it, and the data to be transferred to the disk controllers 4 (1) and 4 (2) is converted to parallel data, and bit errors caused by the added ECC bits are eliminated. The processing unit 53 is provided with a processing unit 53 that performs detection.

Further, the disk devices 6(1) to 6(4) are under the control of the disk controller 4(1), and the disk devices 6(5) to 6 are under the control of the disk controller 4(1).
It is assumed that (8) is under the control of the disk controller 4(2).

Next, the operation of this example will be explained using read/write processing for the disk device 6(1) as an example. Note that ■~@ are symbols indicating points in the time chart shown in FIG.

(11, The disk controller 4(1) receives the input/output command (Sin) issued by the CPUI via the channel device 3.

(At the time of ■) (2), At the same time, the disk controller 4 (1)
The receiver receives information regarding the write block position and number of blocks, and performs a seek + set sector (Set 5ect) on the specified disk device 6 (1).
or) issue an order.

(3) In the above state, the disk controller 4(1) temporarily disconnects the connection with the disk device 6(1).
connect). (At the time of ■) (4) 6-disk device 6 (1) to disk controller 4
In response to (1), an interrupt is raised via the disk control adapter 5(1). (Time point ■) (5) The 0 interrupt reconnects the disk control device 4(1) and the disk device 6(1), and data transfer is started between them. (At the time of ■) (6) When the data transfer is completed, the disk controller 4
(1) sends a completion report to the CPUI via the channel device 3. (At the time of ■) During the period from ■ to ■ described above, the disk control device 4 (1) is connected to another disk device (disk device 6 in FIG. 5).
(2) Perform the processing in ').

Incidentally, the top stage shown in FIG. 7 is the disk control device 4 (1).
Busy (in use) timing.

[Problem that the invention seeks to solve]

As described above, when a plurality of disk devices 6(1) to 6(4) are controlled by one disk control bag ff4(1), the plurality of disk devices 6(1) to 6(4) are controlled by one disk control bag ff4(1). Contention may occur between the disk controllers 4(1).

That is, as shown in the bottom row of FIG.
2) tries to interrupt the disk controller 4(1) at the time of ■, ■, but the disk controller 4(1)
is being connected to disk device 6(1), so the interrupt from disk device 6(2) is rejected.

Therefore, the disk device 6(2) waits for one revolution,
The interrupt is successful at point [phase], and data transfer starts from point 3, resulting in a corresponding delay in data transfer.

In the example shown in FIG. 7, the interrupt is successful after waiting for one rotation, but in the worst case, the waiting continues for many rotations, which is a factor that degrades the performance of the data processing subsystem.

[Means for solving problems]

FIG. 1 shows a detailed illustration of the invention.

The principle diagram of the present invention shown in FIG. 1 consists of functional blocks 1, 4(1), 6(1) to 6(n) explained in FIG.
The MPU 51 explained in the figure. Interface parts 52, 54
, a processing section 53, and a data storage means (data buffer section) 5 having a storage area corresponding to the plurality of disk devices 6(1) to 6(n).
5, and a disk control adapter 50(1) comprising a buffer switching circuit 56 for switching inside the data storage means (data buffer unit) 55.

[Effect]

A data storage area corresponding to the plurality of disk devices 6(1) to 6(n) is provided between the disk control device 4(1) and the plurality of disk devices 6(1) to 6(n) under its control. A disk control adapter 50(1) having a data storage means (data buffer section) 55 is provided, and the disk control adapter 50(1) and a plurality of disk devices 6(1) are provided.
By configuring data transfer from 6(n) to 6(n) to be processed in parallel, the waiting time during data transfer is significantly reduced, making it possible to prevent performance degradation of the data processing subsystem.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 to 4.

FIG. 2 is a block diagram explaining the present invention in detail, FIG. 3 is a diagram explaining a time chart at the time of reading in the embodiment of the present invention, and FIG. 4 is a time chart at the time of writing in the embodiment of the present invention. Diagrams for explanation are shown respectively. It should be noted that all the figures are ilM, and the same reference numerals indicate the same objects.

In this embodiment, it is assumed that four disk devices 6(1) to 6(4) are connected under the control of the disk controller 4(1).

Therefore, the data buffer unit 55 in the disk control adapter 50(1) has four data buffers 55a to 55d.
A buffer switching circuit 56 performs switching when activating these four data buffers 55a to 55d.

Next, the processing operations of this embodiment will be explained separately for read processing (time chart shown in FIG. 3) and write processing (time chart shown in FIG. 4). Incidentally, the processing for the disk device 6(1) among the four disk devices 6(1) to 6(4) will be explained as an example.

(In the case of read processing); (11, A startup command (Sin) command for the disk device 6 (1) is issued from the CPUI to the disk control device 4 (1). (At the time of ■ in Fig. 3) (2 ), the disk control device 4(1) is the disk device 6(
1) is selected, and at the same time the command is received, a read command is issued to the disk device 6(1).

(3) When the above process is completed, the disk controller 4
(1) disconnects from the disk device 6(1).

After that, the disk device 6(1) performs a seek operation.

A set sector (Set 5ector) operation is performed. (
(4) During the above processing, the start command (Sin) command for the disk device 6 (2) is sent to the disk control device 4 (1).
Published in (At the time of ■ in Fig. 3) (5), the disk control device 4 (1) is connected to the disk device 6 (
2) is selected, and at the same time the command is received, a read command is issued to the disk device 6(2).

(6), the disk controller 4(1) is connected to the disk device 6(
2) Disconnect from the connection state. After that, the disk device 6
(2) is a seek operation, a set sector (Se
t 5ector) operation. (At the time of ■ in Figure 3)
(7), disk controller 4 from disk device 6 (1)
An interrupt occurs for (1). (At the time of ■ in Figure 3) (8), disk device 6 (1) and disk control device 4 (
1) is reconnected (at the point of ■ in Figure 3), the disk control adapter 50 (1) is
) through the data buffer 55a to the disk controller 4.
The data is transferred to (1), and the process ends at point (■) in FIG.

(9), the disk device 6(1) is connected to the disk controller 4(
While data is being transferred to 1), an interrupt is generated from the disk device 6(2). (At the time of ■ in Figure 3) a
ω, the disk device 6 (2) is the disk control adapter 50
(1) Data is transferred to and stored in the internal data buffer 55b. However, the transfer to the disk control device 4(1) is not performed (at the time of ■ in Figure 3).
When the data transfer from the disk controller 4 (1) is completed, data transfer from the data buffer 55b to the CPUI via the disk controller 4 (1) is immediately started (FIG. 3, 00'). ), @' in Figure 3
Data transfer ends at point .

(In the case of write processing); The details are as shown in FIG. In other words, the direction of data transfer is opposite to that for read processing, and the direction of data transfer is
Regardless of the rotational position of (1) to 6 (4), is the disk control bag better than CPt1l? ! 14(1), the data is transferred to the data buffer unit 55 in the disk control adapter 50(1).

Thereafter, when the disk drives 6(1) to 6(4) reach a predetermined rotational position, the data from the disk buffer section 55 in the disk control adapter 50(1) is sent to the disk drives 6(1) to 6(4). Transfer and write data.

〔Effect of the invention〕

According to the present invention as described above, even if the disk control device that controls each device is in use, the processing time for input/output commands is shortened without waiting for rotation, and the performance of the data processing subsystem is improved. It is possible to aim for

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the present invention in detail, FIG. 2 is a block diagram explaining the present invention in detail, FIG. 3 is a diagram explaining a time chart at the time of reading in an embodiment of the present invention, FIG. 4 is a diagram for explaining a time chart during writing in the embodiment of the present invention, FIG. 5 is a diagram for explaining a conventional example, FIG. 6 is a diagram for explaining a disk control adapter in a conventional example, and FIG. 7 is a diagram for explaining a conventional example. Figures illustrating a data transfer time chart are shown, respectively. In the figure, 1 is the CPU, 2 is the main storage device, 3 is the channel device, 4(1) to 4(2) are the disk controllers, 5(1),
5(2), 50(1) are disk control adapters, 6(1)
) to 6(n) are disk devices, 51 is an MPU, 52.54 is an interface section, 53 is a processing section, 55 is a data buffer section, 5
5a to 55d are data buffers, and 56 is a buffer switching circuit. J Shibaru 9 Ten Keisuke Ha; A 1 Riulino (Ri Buddha Sea Island Akira ID Moon fri group different drawings fl[') Husband 11" 15 On fishing 4'J%-nm
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Claims (1)

[Scope of Claims] A disk control device (4(1)) that controls a plurality of disk devices (6(1) to 6(n)) under its control by instructions from a host device, and the disk control device (4(1
)) in a data processing subsystem comprising a plurality of disk devices (6(1) to 6(n)) that perform data read/write processing under the control of the plurality of disk devices (6(1) to 6(n)). A disk control adapter (50(1)) equipped with a data storage means (55) having an area corresponding to the disk controller (4(1)) and the plurality of disk devices (6(1)
) to 6(n)), and based on the control of the disk control device (4(1)), the disk control adapter (50(1)) and the plurality of disk devices (6(1) to 6(n)) Data is exchanged during data read/write processing executed between the plurality of disk devices (6(1)) via the data storage means (55) in the disk control adapter (50(1)). 1
) to 6(n)) in parallel.