JPH01128122A - Control system for volume dynamic copying - Google Patents

Abstract

PURPOSE:To carry out a copying process without discontinuing the processes to the input/output requests except for the copy input/output under processing by controlling those processes to said input/output requests after dividing these processes into a copy end area, an under-copy area, and an unfinished copy area respectively. CONSTITUTION:A volume copy process is started to a separated volume 13 from a normal volume 12 so that the volume 13 is incorporated for duplication of a volume. In such a case, a copy start means 1 initializes a copy control table 6 and starts a copy process means 3. The means 3 controls the processes to the input/output requests except the copy input/output under processing against the volume 13 after dividing those processes into a copy end area, an under-copy area, and an unfinished copy area. Thus it is possible to carry out the efficient volume copying process without discontinuing the processes to the input/output requests except the copy input/output under processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a volume dynamic copy control system, and particularly to a volume dynamic copy control system in volume duplication control.

[Conventional technology]

Conventionally, in volume duplication control, two magnetic disk drives are divided into a primary volume and a secondary volume, read operations are distributed to one of the volumes and input is executed, and write operations are output to both volumes. As a result, input/output is performed while always matching the primary volume and secondary volume, and if a failure occurs in one of the volumes, the failed volume or the failed part is disconnected and input/output is performed. Output processing continues.

If you incorporate a detached volume that was detached due to a failure when such volume duplexing control is being performed and operate the volume again by duplicating the volume, detach the data of the normal volume in which no failure has occurred. Volume copy processing is required to copy to the volume.

Conventionally, this type of volume copy processing has been performed in a situation where no input/output other than copy input/output is being executed.

[Problem that the invention seeks to solve]

The conventional volume copying process described above had to be performed in a situation where no input/output other than copying input/output was being executed, so in 24-hour operation systems, etc., it is currently necessary to perform the detached volume in order to reincorporate it. The disadvantage is that operations must be reduced or stopped.

In view of the above-mentioned points, an object of the present invention is to provide a volume operation system that can perform volume copy processing without stopping execution of input/output other than copy input/output when a detached volume is incorporated and the volume is redundantly operated again. The purpose of this invention is to provide a comprehensive copy control system.

[Means for solving problems]

The volume dynamic copying control method of the present invention divides two magnetic disk devices into a primary volume and a secondary volume, reads data from one volume, executes input data, and writes data from both volumes. Execute output to the primary volume and always perform input/output while matching the secondary volume. If a failure occurs in either volume, the volume that caused the failure or the volume that caused the failure In volume duplexing control, which continues input/output processing by separating the faulty part of a volume, if a fault occurs and the volume itself or the detached volume from which the faulty part was removed is installed and the volume is redundant and operated again, the fault may occur. Copy start means for declaring the start of copying by setting a copy status display indicating that copying is in progress and a copy address at which copying is to be started in a copy control table in order to perform a volume copying process of a non-occurring normal volume to the detached volume; The copy start means is activated to read a certain amount of data from the address of the normal volume indicated by the copy address, and write a certain amount of data from the address of the detached volume indicated by the copy address. a copy processing means that performs the volume copying process by repeating a process of updating the address of the detached volume and, if copy waiting is set in the copy control table at that time, notifying the copying input/output means to that effect; When the copy status display indicating that copying is in progress is set in the copy control table, a check is made for input/output requests other than copy input/output, and if the input/output requests other than copying input/output are input requests, the copying input/output is performed. If the input/output request other than the copy input/output request is an output request, read the data requested by the input/output request other than the copy input/output from the normal volume. When the write address is smaller than the copy address by comparing with the copy address, writing of data requested to be output by an input/output request other than the copying input/output is executed to the normal volume and the detached volume, and the writing is performed. When the address and the copy address are the same address, the copy wait state is set in the copy control table, and after receiving a notification from the copy processing means that the copy wait state is set, the copy wait state is set. When an I/O request other than output writes the data requested for output to the normal volume and the detached volume, and the write address is larger than the copy address, the I/O request other than the copy I/O request is an output request. and the copying input/output means for writing data to the normal volume.

[Effect]

In the volume dynamic copy control method of the present invention, when a failure occurs in the copy start means and the volume itself or a detached volume from which the failure part has been separated is installed and the volume is redundant and operated again, no failure occurs. In order to detach a normal volume and copy the volume to the volume, set the copy status display indicating that copying is in progress and the copy address to start copying in the copy control table.
2 to declare the start of copying, the copy processing means is activated by the copy start means, reads a certain amount of data from the address of the normal volume indicated by the copy address, and writes the copy address from the address of the detached volume indicated by the copy address. The volume copying process is performed by updating the address of the next detached volume to which data has been written, and repeating the process of notifying the input/output unit during copying if copy waiting is set in the copy control table at that time. The copying input/output means checks for input/output requests other than copying input/output when the copy status display indicating that copying is in progress is set in the copy control table, and if the input/output request other than copying input/output is an input request. If an input/output request other than copy input/output manually requests reading of data from a normal volume, and if the input/output request other than copy input/output is an output request, the write address and copy that the input/output request other than copy input/output has If the write address is smaller than the copy address, the data requested by the I/O request other than copy I/O is written to the normal volume and the detached volume, and the write address and copy address are the same. In the case of an address, after setting copy waiting in the copy control table and receiving notification from the copy processing means that copy waiting is set, write data that is requested for output by an input/output request other than copy input/output that is waiting for copy. is executed on the normal volume and the detached volume, and when the write address is larger than the copy address, writing of data requested for output by an input/output request other than copy input/output is executed on the normal volume.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a volume dynamic copy control system according to an embodiment of the present invention. The volume dynamic copy control method of this embodiment includes a copy start means 1, an input/output means 2 during copying, a copy processing means 3, a copy control table 6, an input/output request 10 other than copy input/output, and a normal It consists of a volume 12 and a detached volume 13.

The copy processing means 3 includes a copy manual means 4 and a copy output means 5.

The copy control table 6 includes a copy status display area 7, a copy address area 8, and a copy waiting queue area 9.
It is composed of.

An input/output request 10 other than a copyer output includes a read address (not shown) in the case of an input request, and a write address 11 in the case of an output request.

Next, the operation of the volume dynamic copy control system of this embodiment configured as described above will be explained.

In volume duplication control, if a failure occurs in one of the volumes, the failed volume is separated,
It is assumed that input/output is performed only to the normal volume 12 in which no failure has occurred.

Detached volume 1, which is a volume from which a failure has been recovered or a volume to replace the volume in which a failure has occurred.
When starting the volume copying process from the normal volume 12 to the detached volume 13 in order to incorporate Volume 3 and operate the volume again with duplication, the copy starting means 1 displays the copying status display area 7 of the copy control table 6. A copy status display indicating the copy of the copy source normal volume 12 is displayed in the copy address area 8.
Start address (copy destination detached volume 13)
By setting the copy addresses indicating the same values), the copy control table 6 is initialized and the copy start is declared, and the copy processing means 3 is activated.

When the copy start means 1 sets a copy status display indicating that copying is in progress in the copy status display area 7 of the copy control table 6 and declares the start of copying, from then on, the copy input/output means 2 outputs data other than output from the copying person. All input/output requests 10 are checked, and if the input/output requests 10 other than the copy person output are output requests, and the write address 11 and the copy processing status set in the copy address area 8 of the copy control table 6 are the same address. If so, the input/output requests 10 other than the copy person's output are held in the copy waiting I10 queue area 9 of the copy control table 6.

On the other hand, the copy processing means 3 activated by the copy start means 1 instructs the manual copy means 4 to start manual copying.

The manual copying means 4, which has been instructed by the copying processing means 3 to manually start copying, refers to the copy address area 8 of the copy control table 6 and starts from the address of the normal volume 12 indicated by the copy address set in the copy address area 8. Read a certain amount of data.

When the copy manual means 4 finishes reading a certain amount of data from the normal volume 12, the copy processing means 3 instructs the copy output means 5 to start copy output.

The copy output means 5 is instructed to start copy output by the copy processing means 3, and the copy output means 4 outputs the normal volume 1.
A certain amount of data read from volume 2 is transferred to normal volume 12.
The data is written to the detached volume 13 from the same address as the one at which the copy process was started.

When the copy output means 5 finishes writing a certain amount of data to the detached volume 13, the copy processing means 3 causes the copy output means 5 to transfer the copy address set in the copy address area 8 of the copy control table 6 to the data. The address of the detached volume 13 for which writing has been completed is updated to the next address.

Next, the copy processing means 3 refers to the copy waiting I10 queue area 9 of the copy control table 6 to check whether or not an input/output request 10 other than the copy person output is pending. If there is an input/output request 10 other than output, it notifies the input/output means 2 during copying to that effect, and then instructs the copying person output means 4 to start copying manually, and if there is no pending input/output request 10 other than copying person output. Then, the manual copying means 4 is instructed to start manual copying.

Next, other than the copy input/output of the copy input/output means 2 while the copy processing means 3 is performing copy processing (when the copy status display indicating that copying is in progress is set in the copy status display area 7 of the copy control table 6). The control for the input/output request 10 will be explained.

When the copy status display indicating that copying is in progress is set in the copy status display area 7 of the copy control table 6,
The copying input/output means 2 checks all input/output requests IO other than copy input/output.

If the input/output request 10 other than copy input/output is an input request, the copying input/output means 2 will respond to the input/output request 1 other than copy input/output regardless of the copy processing by the copy processing means 3.
Data is read from the address of the normal volume 12 indicated by the read read address of 0.

If the input/output request 10 other than copy input/output is an output request, the copying input/output means 2 refers to the copy address area 8 of the copy control table 6 and writes the input/output request 10 other than copy input/output. The address 11 is compared with the copy address set in the copy address area 8.

If the write address 11 is smaller than the copy address, this is an output request to write data to an address within the copy completion area where the data copy process from the normal volume 12 to the detached volume 13 has already been completed. As shown in FIG. 2, the copying input/output means 2 writes data to the addresses of the normal volume 12 and detached volume 13 indicated by the write address 11 of the input/output request 10 other than copy input/output.

If the write address 11 is the same address as the copy address, this is an output request requesting to write data to the address where the copy process is currently being executed. As shown, input/output requests 10 other than copy input/output are held in the copy waiting I10 queue area 9 of the copy control table 6.

Processing for the input/output request 10 other than the copy input/output held in the copy waiting I10 queue area 9 is performed by switching the currently executing copy process to the next address as described above, and transferring the processing to the copy waiting I10 queue by the copy processing means 3. This is executed by the copying input/output means 2 when the area 9 is notified that the input/output request 10 outside the copy person output board is pending. Waiting for copy I10 from copy processing means 3
When it is notified that an input/output request other than copy input/output is pending in the queue area 9, the copy waiting I10
Since the write address 11 of the input/output request 10 other than the copy input/output pending in the queue area 9 is an address within the copy completion area, the copying input/output means 2 can perform the copy operation described in FIG. An input/output request other than copy input/output]O is executed in the same way as when writing data to an address in the completion area.

If the write address 11 is larger than the copy address, it is an input/output request 10 other than copy input/output that requests writing of data to an address in the uncompleted copy area where the copy process has not been completed, so the copying is in progress. As shown in FIG. 4, the input/output means 2 writes data to the address of the normal volume 12 indicated by the write address 11 of the input/output request 10 other than copy input/output.

If there are multiple write addresses 11, one smaller than the copy address and the other larger than the copy address, the input/output means 2 during copying is configured so that the write address 11 is smaller than the copy address, as shown in FIG. Data is written to the normal volume 12 and detached volume 13 in the same way as explained in FIG. Data is written only to volume 12.

The copy processing by the copy processing means 3 is repeated, and the copy processing is performed on the normal volume 12 and the detached volume 1.
When the volume copy processing has been executed up to the last address of No. 3, the copy processing means 3 declares a copy state display indicating the completion of copying in the copy state display area 7 of the copy control table 6, and completes the volume copy processing.

〔Effect of the invention〕

As explained above, the present invention provides processing for input/output requests other than copy input/output during copy processing from a normal volume to a detached volume in order to duplicate a volume again. By controlling the areas separately, there is an effect that the volume copying process can be executed efficiently without stopping processing for input/output requests other than the copying person's output during the copying process.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a volume dynamic copy control system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the address of the copy completion area in the copying input/output means shown in FIG. FIG. 3 is a diagram for explaining the processing for output requests other than the copying person output, which shows the address of the area being copied in the copying input/output means in FIG. 1. , FIG. 4 is a diagram for explaining the processing for an output request other than the copy person output indicating the address of the uncompleted area of the copying input/output means in the copying input/output means in FIG. 1, and FIG. FIG. 6 is a diagram for explaining processing for an output request other than a copy person output indicating addresses of a copy completed area and a copy unfinished area in an intermediate input/output unit. In the figure, 1... Copy start means, 2... Copy input/output means, 3... Copy processing means, 4... Manual copy means, 5... Copy output means, 6... Copy Control table, 7... Copy status display area, 8... Copy address area, 9... Copy waiting I10 queue area, 10... Input/output requests other than copy person output, 11... Write address, 12... Normal volume, 13... Detached volume.

Claims (1)

[Claims] Two magnetic disk devices are divided into a primary volume and a secondary volume, read operations are distributed to either volume and input is executed, and write operations are output to both volumes. Always perform input/output while matching the primary volume and secondary volume, and if a failure occurs in one of the volumes, disconnect the failed volume or the failed part of the failed volume. In volume duplexing control that continues input/output processing after a failure occurs, the volume itself or the failed part is detached and the detached volume is incorporated and the volume is duplexed again for operation. a copy start means for declaring the start of copying by setting a copy status display indicating that copying is in progress and a copy address at which copying is to be started in a copy control table in order to copy the volume to the detached volume; When activated, a certain amount of data is read from the address of the normal volume indicated by the copy address, and written from the address of the detached volume indicated by the copy address, and the copy address is set to the next address of the detached volume to which data is written. a copy processing unit that performs the volume copying process by repeating a process of updating and notifying a copying input/output unit of this if copy waiting is set in the copy control table at that time; When the copy status display indicating that copying is in progress is set, check is made for input/output requests other than copy input/output, and if the input/output request other than copying input/output is an input request, the input/output request other than the copying input/output is processed. reads the data requested for input from the normal volume, and if the input/output request other than the copy input/output is an output request, compare the write address possessed by the input/output request other than the copying input/output with the copy address. When the write address is smaller than the copy address, writing of data requested for output by an input/output request other than the copy input/output is executed to the normal volume and the detached volume, and the write address and the copy address are written. and are the same address, set the copy wait in the copy control table, and after receiving a notification from the copy processing means that the copy wait is set, input/output other than the copy input/output waiting for copy. Execute writing of the data requested for output by the request to the normal volume and the detached volume, and when the write address is larger than the copy address, write the data requested to be output by an input/output request other than the copy input/output. A volume dynamic copying control method, comprising: the copying input/output means executed on the normal volume.