JPS6356720A - Disk controller - Google Patents

Abstract

PURPOSE:To attain an optimum disk control irrelevantly to the load of a computer system constitution by providing a means which switches a monitor program according to the computer system constitution. CONSTITUTION:Interfaces 11 and 12 are connected to CPUs A and B through ports PA and PB. When one CPU is connected, the interface 12 is disconnected. A programmable control means 13 consisting of a microprocessor, a unit, and a memory controls the whole disk controller by having monitors m1-m3 which select an interface driver and respective modules for contention cross call control and cross call I/F control, etc. The program switching means 14 selects only one of the monitors m1-m3 according to the system constitution. Consequently, the disk control suitable to the system constitution is attained and the optimum disk control is performed.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disk control device having a cross-call function that can be accessed from a plurality of central processing units, and in particular to a disk control device that is capable of performing optimal control according to the computer system configuration. This invention relates to a disk control device that has been improved.

<Prior art> An example of the configuration of a computer system consisting of a disk Bffi having a cross-call function and a central processing unit is shown in FIG. 4(a).
, (b) and (c).

The example in FIG. 4(a) shows two central processing units l! ! Device CPtJ
A1. CPUB2 is the boat PA, PB of disk device 3
It is connected to the. The disk device 3 has ports PA, P
3. A disk control device having B and controlling the disk 32.
Equipped with:

An example of this computer system is two CPUs 1.

The CPU B2 processes the shared data in the disk 3□, and there is a possibility that two CPUs access the disk 32 at the same time.

In the example of FIG. 4(b), CPU1. This is an example in which the monitoring device 4 is installed between the CPUB2 and the CPUs are duplicated, and two control units are required for the interface of the disk device 3 for each CPU, but basically one CPU is required.
U accesses the disk device 3.

The example in FIG. 4(C) is an example in which the cross-call disk device 3 is used as one central processing unit cpu△1, and the cross-call interface part in the disk control ill device 31 in the disk device 3 is used. This is an example with the control circuit removed.

In the above three flywheel systems, the disk controller 3. Although the disk access portions within each have the same configuration, the functions required of the boat sections P△, PB, interface section, and cross-call control section that connect the CPUs are different because they perform different operations.

That is, in the example shown in FIG. 4, the required function is (a
), (b), and (c) become smaller in this order. Therefore, the load required for the disk control I device is (a).

(b) and (c) become smaller in this order.

However, since normal cross-call disks use the same control method regardless of the system configuration used, if the load on the cross-call disk is small, access time is wasted. Occur.

1'Problems to be Solved by the Invention> The problems to be solved by the present invention are to perform optimal disk access control regardless of the load on the system configuration. The purpose is to improve time.

Means for Solving the Problems> The present invention solves the above problems by providing a monitor for shared data access in a disk control device having a cross-call function accessible from a plurality of central processing units.
Program, central processing unit redundant system monitor/
The disk control device is characterized in that it has a program, a single system monitor program, and program switching means for switching between the three monitor programs in accordance with a computer system configuration.

Functions> The disk access control device of the present invention has a load on the cross-call control function that varies depending on the configuration of the computation system, and performs disk access control operations using the minimum functions that meet the system requirements.

Embodiments> FIG. 1 is a conceptual diagram of a configuration of a disk control device of the present invention.

In this figure, CPUs 11.12 and 11.12 are connected to CPUs Δ1, . C
Interface [/FA, B connected to PU[32]
When connecting to one CPU, disconnect the I/FB. 13 is a programmable control means that manages the entire disk control device and is composed of a microprocessor unit and memory; 14 is a programmable control means that functions for the memory within the programmable control means 13; 15 is a normal disk υ1 switching means, and 3 is a disk.

Next, the concept of the firmware configuration in this configuration is shown in FIG.

(7) The monitors m1, m2. m3 (O8
: operating system) is selected by the program switching means 14 depending on the computer system configuration.
Only those items are selected. These monitors m1. m2. m
3 calls the driver and control section (module).

Here, the monitor m1 is for shared data access from two CPUs, the monitor m2 is for a CPU duplex system, and the monitor m3 is for a single system, as shown in FIG. 4(a).

It is selected corresponding to the systems (b) and (c).

monitor m1. m2. m3 is an interface r/FA of port P△, PB, and B driver 11'.

12', disk driver 3', cross call I/F
Control 16, competitive cross call control 1
7. Select and operate each module of the cross-call disk control 18.

Additionally, the modules called by each monitor are as follows.

Monitor m1 (for shared data access); All module monitor m2 (for CPU duplex system) 1/FA,
B driver 11', +2' disk driver 3' Cross call I/F control 16 Monitor m3 (for single system); 1/FA, B
Drivers 11', 12'Disk Driver 3' Here, the fewer modules are called, the more the throughput of the firmware is improved.

FIG. 3 shows how the program switching means 14 monitors
1 is selected, a CPU interrupt is made from the boat PA, and the cross call I/F control 16,
The contention cross call control 17 is activated and the I/
Command processing is performed by the FA driver 11'. Further, the cross-call disk control 18 and the disk driver 3 are driven to perform seek processing.
Data processing is executed in the disk driver 3 and I/FA driver 11', and the processing of -j1 is completed.

If monitor m2 is selected at the monitor switching stage, the module indicated by "△" will not be selected and the command,
Seek and data processing operations are performed.

If monitor m3 is selected at the monitor switching stage, the module indicated by "○" is not selected and the command,
Seek and data processing operations are performed.

In this way, depending on the configuration of the computer system, the monitor
1, monitor m2, and monitor m3 are selected. Each monitor is driven by a different module, and each monitor can perform disk access control operations with only the minimum functions.

<Effects of the Invention> The disk control device of the present invention has a load on the cross-call control function that differs depending on the configuration of a total of 611 systemdems, and performs disk access control operations using the minimum functions that meet the system requirements. Optimal disk control can be performed regardless of the load on the configuration, and disk access time can be improved.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the configuration of a disk-based OII device embodying the present invention, FIG. 2 is a firmware configuration diagram of the disk control 2a device of the present invention, and FIG. 3 is a flowchart showing modules driven according to the monitor. Figure 4(a),
<b) and (c) are configuration diagrams showing a computer system. 1...center! 28 embedded device CPUA, 2... central processing unit CPUB, 3... disk device, 3I... disk control device, 3゜... disk, 3'... disk driver, 11... interface I/FA. 11'...Interface f/FA driver, 12...Interface l/FB, 12'・
...Interface I/FB driver, 13...Programmable interrogation means, 14...Program switching means, 15...Disk control means, 16...Cross call I/F control,
17... Competitive cross-call control, 18...
・Cross call disk control. Figure 1 Figure 2 Figure 3 Figure 4 (α) (b)

Claims (1)

[Claims] In a disk control unit with a cross-call function that can be accessed from multiple central processing units, it is equipped with a monitor program for shared data access, a monitor program for a dual central processing unit system, and a monitor program for a single system. A disk control device comprising program switching means for switching between the three monitor programs according to the configuration.