JPH03129515A - Duplication control system for disk device - Google Patents

Abstract

PURPOSE:To reduce labor for changing software by inspecting writing operation in a duplicated disk device by deciding whether written control information is left without being deleted or not. CONSTITUTION:When a write request is inputted, a control information writing means 127 stores control information relating to writing operation in a control information storing means 123 and commands a writing means 125 to write data. The writing means 125 writes data stored in a data storing means 131 in two duplicated disk devices 111, 113 in accordance with the command. When the writing operation is completed, the control information stored in the means 123 prior to the writing operation is deleted by a control information deleting means 129. Thus the writing operation in the duplicated disk devices 111, 113 is inspected by deciding whether the control information written in the means 123 is left without being deleted or not. Thus labor for changing the software can be reduced.

Description

[Detailed Description of the Invention] [Summary] Regarding a redundant control method for disk devices in which disk devices are duplicated to improve reliability, the present invention relates to a redundant control method for disk devices in which disk devices are duplicated in order to improve reliability. The storage device has a disk device that has been installed, a disk control device that writes data to these disk devices, and a data storage means that stores the data, and the disk control device writes data stored in the data storage device to both the two disk devices. In the redundant control system for disk devices, the disk control device has a nonvolatile storage medium, and has a management information storage means for storing management information related to data writing operations, and writes data stored in the data storage means to both the disk device. a writing means for performing the operation;
When a write request instructing data writing is input, an operation instruction is given to the writing means, and
management information writing means for storing management information in the management information storage means; and management information deletion means for deleting the management information stored in the management information storage means prior to the writing operation when the writing operation by the writing means is completed. The system is configured to have the following.

[Industrial application field]

The present invention relates to a duplex control method for disk devices in which disk devices are duplicated to improve reliability.

In recent years, information processing devices have significantly improved performance and reduced manufacturing costs, and are used in a wide range of fields. Particularly in the field of financial institutions, reliability is improved by duplicating the entire device or each component. For example, by duplicating disk devices, it is possible to improve the reliability of stored data.

[Conventional technology]

FIG. 5 shows the configuration of a conventional computer system with dual disk devices. In the figure, 511 is the CPU
(central processing unit), 521 is memory, 523 is O
3 (operating system), 525 a user program, 531 a disk control adapter, 541
．． Reference numeral 543 indicates a disk device.

The computer system described above is equipped with duplicated disk devices 541 and 543, and for example, the CPU 511
When a request to write data to a disk device occurs when the user program 525 in the memory 521 is executed, the same data is written to the two disk devices 541 and 543 duplicated by the disk control adapter 531. be exposed. Therefore, these disk devices 541. By confirming that the data stored in -543 is the same, that is, the data is equivalent, the reliability of the data can be increased.

FIG. 6 shows the operating procedure regarding this equipartiality confirmation. In the above, "#0" corresponds to the disk device 541, and "#I" corresponds to the disk device f543.

(2) For example, a disk write request occurs while the user program 525 is being executed.

■03523 responds to this disk write request by
First, isotropic management information (for example, consisting of a data writing position and a flag indicating that data is being written) is written to the disk device 541 (#O). 035
23 sends the homogeneous management information regarding the disk device 541 to the disk control adapter 531, and the disk control adapter 531 further sends this homogeneous management information to the disk device 5.
41 at a predetermined location.

Similarly, homobiased management information is written to the disk device 543 (#1).

■Next, ○5523 writes the data requested to be written by the user program 525.

Data is written to the disk device 541 and the same data is written to the disk device 543.

(2) When data writing is completed, the homogeneous management information written in each of the disk devices 541 and 543 in (2) above is deleted.

In this way, the isotropic management information is written and deleted before and after data is written to the disk devices 541 and 543. Therefore, for example, if the power is momentarily cut off while data is being written, it will be possible to recognize that equivalence is not guaranteed because the homogeneity management information has not been deleted the next time the power is turned on, and copy the disk. Alternatively, equality can be guaranteed by reoperation.

Further, in the conventional example described above, 03523 accesses the disk devices 541 and 543 with duplication in mind, but another conventional example is also conceivable in which the disk control adapter 531 is aware of duplication. In this case, 03523 writes data to one disk device without being aware of duplication. The disk control adapter 531 transfers this data to two disk devices 54.
1.543, and to each predetermined area of the disk devices 541 and 543 before and after that. Write and delete the individuality management information as described above.

[Problem to be solved by the invention]

By the way, in the conventional method described above, since the storage area of the disk devices 541 and 543 is used as the storage area of individuality management information such as writing before data,
5523 etc., it was necessary to be aware of the storage area, and it was necessary to change the software.

In addition, it is necessary to access the disk devices 541 and 543 each time the individuality management information is written or deleted, and since this disk access involves mechanical operation, there is a problem that processing time is required.

The present invention was created in view of the above points, and an object of the present invention is to provide a redundant control system for disk devices that can reduce the effort of changing software and shorten processing time.

[Means to solve the problem]

FIG. 1 is a principle block diagram of a duplex control system for a disk device according to the present invention.

In the figure, the disk drive duplex control method of the present invention includes duplex disk drives 111 and 113, a disk control device 121 that writes data to these disk drives 111 and 113, and a data storage means 131 that stores data. The data stored in the data storage means 131 is transferred to two disk drives by the disk control device 121! 111° and 113.

Further, the disk control device 121 has a non-volatile storage medium, and has a management information storage means 123 that stores management information related to data writing operations, and an operation that writes data stored in the data storage means 131 to both the disk devices 111 and 113. and management information writing means 127 that gives an operation instruction to the writing means 125 and stores management information in the management information storage means 123 when a write request instructing data writing is input. , and management information deletion means 129 for deleting the management information stored in the management information storage means 123 prior to the writing operation when the writing operation by the writing means 125 is completed.

[Operation] When a write request is input, the management information writing means 1
27 stores management information regarding the write operation in the management information storage means 123 and instructs the writing means 125 to write data.

The writing means 125 converts the data stored in the data storage means 131 into two duplicates according to this instruction.
A writing operation is performed on both disk devices 111 and 113. When the write operation is completed, the management information stored in the management information storage means 123 prior to the write operation is deleted by the management information deletion means 129.

In the present invention, the writing operation to the duplicated disk devices 111 and 113 is verified depending on whether the management information written to the management information storage means 123 in the disk control device 121 remains without being deleted. be able to. Therefore, for this verification, the disk device 111.1
There is no need to access 13.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the same aspects.

FIG. 2 shows the configuration of a computer system in an embodiment to which the disk device duplication control method of the present invention is applied.

Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

Disk device 111□ 113 is disk device 211
．． Corresponds to 213.

The disk control device 121 corresponds to the disk III control adapter 221.

The management information storage means 123 corresponds to the nonvolatile memory 255.

The writing means 125 includes an MPU (microprocessor) 251. Memory 253. Disk controller 257
．． ) Corresponds to the transceiver 259.

The management information writing means 127 corresponds to the MPU 251° memory 253.

The management information deletion means 129 includes the MPU 251. memory 25
Corresponds to 3.

Data storage means 131 corresponds to memory 231.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

In FIG. 2, 210 is a CPU, 211, 213 is a disk device, 221 is a disk control adapter, 2
31 each indicate a memory. CPU210. A disk control adapter 221 and a memory 231 are connected via a system bus ξ7, and two disk devices 211 and 213 are further connected to the disk control adapter 221.

The CPU 210 is for controlling the entire computer system and performing calculation processing.

In addition, the disk control adapter 221 has two
Input/output control is performed for two disk devices 211 and 213. Inside the disk control adapter 221, 251 is an MPU, 253 is a memory, 255 is a non-volatile memory, 257 is a disk controller, 2
Reference numeral 59 indicates a transceiver. Each of these components is connected via an internal bus.

The MPU 251 controls the entire disk control adapter 221, and the memory 253 stores its operating program. The nonvolatile memory 255 is for storing redundant write raw information for confirming that the data stored in the disk devices 211 and 213 by the write operation by the disk control adapter 221 is the same, that is, that the data is homogeneous. It is. Further, the disk controller 257 is for accommodating cables to which the disk devices 211 and 213 are connected, and for controlling the transmission and reception of signals. The transceiver 259 is separated from the bus driver and bus receiver, and controls the transmission and reception of signals between the system bus of the computer system and the internal bus within the disk control adapter 221.

Furthermore, the memory 231 stores operating programs for the CPU 210 and the like. Specifically, the user program 233. Dedicated program 235°O3 (operating system) 23'7. Channel command word (CC
W) 239. Write data 241 and the like are stored.

Next, the operation of the first embodiment of the present invention will be explained.

FIG. 3 shows the operating procedure of the disk control adapter 221 of the embodiment. In the figure, "#0" is the disk device 21
1 and “#1” correspond to the disk device 213, respectively. Further, each symbol such as ■, ■, etc. shown on the leap line corresponds to each symbol used in the following explanation.

■First, a write request to the duplicated disk devices 211 and 213 occurs, and the disk control adapter 22
1 is input.

For example, if a disk startup command is executed while the CPU 210 is executing the user program 233, the 0
3237 sends a startup instruction to the disk control adapter 221 in accordance with this startup command. When a startup instruction is given manually, the disk $1 control adapter 221 reads and analyzes the second CCW 239 in the memory 231. As a result of the analysis, if it is determined that it is a write request to the disk devices 211, 213, subsequent control operations are started.

Note that the above-mentioned startup command and startup instruction do not need to be aware of duplication, and the disk control adapter 221 that has analyzed the CCW 239 autonomously starts input/output control compatible with duplication.

(2) Next, the MPU 251 writes information for managing duplex equivalence into the nonvolatile memory 255. This information is duplex write raw information indicating that writing to the disk device 211, 213 is in progress, and includes a flag indicating that writing is in progress, write address information, etc. (first sector number and number of sectors).

(2) Duplicated writing When writing of the raw information is completed, the MPU 251 then writes the data requested to be written to the disk devices 211 and 213.

The data to be written is stored in a predetermined area in the memory 231 as write data 241, and the MPU 2
51 reads this write data 241 and sends it to the disk devices 211 and 2 via the disk controller 257.
Write on both sides of 13.

■When the writing of data to the two disk devices 211 and 213 is completed normally, the MPU 251 deletes the redundant write raw information stored in the nonvolatile memory 255 prior to the data writing operation, and performs control operations related to data writing. finish.

Next, a description will be given of the operation when data equivalence is verified based on the presence or absence of duplex write raw information in the nonvolatile memory 255. FIG. 4 shows the operational procedure for equivalence verification.

For example, when the computer system shown in FIG. 2 is powered on, the CPU 210 executes the dedicated equivalence verification program 235 before executing the 03237° user program 233 and the like.

First, the CPU 210 that has executed the dedicated program 235 reads out the duplex write raw information in the nonvolatile memory 255 (step 411).

Next, the CPU 210 determines whether the duplicated data stored in the disk devices 211 and 213 are equivalent (step 412). If there is no duplex write raw information to be read (if the duplex write raw information has been deleted), it is determined that the duplex write operation has ended normally and the data are equivalent. In this case, an affirmative determination is made in step 412, and system startup such as starting 03237 is executed (step 413).

Furthermore, if the duplexed write raw information exists in the nonvolatile memory 255, this means that the operation is interrupted while writing the duplexed data, and the CPU 210 makes a negative determination in step 412 (whether or not they are equivalent). In this case, for example, the data in the disk device 211 whose storage location is specified by the duplex write raw information is copied to the corresponding area of the disk device 213 (step 414), data equivalence is ensured, and then step 413 Start the system.

In this way, the duplex write raw information is written into the nonvolatile memory 255 prior to the data write operation to the disk units 2211 and 213, and the duplex write raw information is deleted after the write operation is completed. Therefore, if the power is momentarily cut off during a data write operation, the redundant write raw information remains in the non-volatile memory 255, and by checking the presence or absence of this redundant write raw information, data equivalence can be determined. Verification of gender becomes possible.

Furthermore, since this redundant written raw information is written to the nonvolatile memory 255 in the disk control adapter 221, the storage area of the disk devices 211 and 213 can be freely used by the user program 233, etc. Therefore, when creating software, there is no need to provide a write area for duplicated write raw information, and conventional software can be used.

Furthermore, for this redundant written raw information, on day 7, the redundant 2211. Since there is no need to access 213, processing time can also be shortened.

In the embodiment of the present invention, writing of data to the disk devices 211 and 213 is controlled by the disk control adapter 221, but this disk control adapter 221 is also called a disk control device, a channel device, etc. In a small-scale system, it may be realized by direct control of the CPU 210.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to verify a write operation to a duplicated disk device based on whether or not the management information written to the management information storage means in the disk control device remains without being deleted. This eliminates the need to access the disk device for this verification. Therefore, the storage area of the disk device used for this access is no longer required, so you don't need to be aware of it, which reduces the effort required to change software and reduces processing time, which is extremely useful in practice. .

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the duplex control system for a disk device of the present invention, Fig. 2 is a configuration diagram of an embodiment of the invention, Fig. 3 is an explanatory diagram of the operation of the embodiment, and Fig. 4 is a diagram of the embodiment. FIG. 5 is a configuration diagram of the conventional example, and FIG. 6 is an explanatory diagram of the operation of the conventional example. In the figure, 111 and 113 are disk devices, 121 is a disk control device, 123 is a management information storage means, 125 is a writing means, 127 is a management information writing means, 129 is a management information deletion means, 131 is a data storage means, and 210 is a data storage means. CPU. 211.213 is a disk device, 221 is a disk control adapter, 231.253 is a memory, 233 is a user program, 235 is a dedicated program, 237 is O3 (operating system), 239 is C
CW (channel command word) 241 is write data, 251 is an MPU (microprocessor), 255 is a nonvolatile memory, 257 is a disk controller, and 259 is a transceiver. Figure 4

Claims (1)

[Claims] (1) It has dual disk devices (111, 113), a disk control device (121) that writes data to these disk devices (111, 113), and a data storage means (131) that stores data. , the data storage means (1) is controlled by the disk controller (121).
31) is stored on two disk devices (111, 1).
13) In a dual control system for a disk device, the disk control device (121) includes: a management information storage means (123) having a non-volatile storage medium and storing management information related to data writing operations; , a writing means (125) that performs an operation of writing data stored in the data storage means (131) to both of the disk devices (111, 113); management information writing means (127) for giving operation instructions to the means (125) and storing the management information in the management information storage means (123); and when the writing operation by the writing means (125) is completed; and a management information deletion means (129) for deleting the management information stored in the management information storage means (123) prior to the write operation. .