JP2000194508A - Computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an availability-improved computer system in which data migration in a storage device of an external storage device system can be executed to a storage device in a host computer while accepting read/write requests from the host computer for migration object data which are stored in the storage device system. SOLUTION: A system processor 13 administers the internal storage device 17 and a data migration processing 133 refers to and updates data migration management information 1121 to move data from the storage device system 2 to the internal storage device 17. A read process 131 and a write process 132 refer to the data migration management information 1121, and reads and writes object data which are to be moved but have not been moved with the storage device system 2 and other data with the internal storage device 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a computer system for migrating data from a storage device in a storage device system to a storage device in a host computer system.

[0002]

2. Description of the Related Art In general, a storage system employing a RAID system has redundancy in components such as a processor, a cache memory, and an internal bus. Has become. And, for example, "Mainframe '98, Nikkei BP,
Published March 2, 1998, pp. 46-47 ", competition for high availability is intensifying, for example, there is a movement to level the availability of storage systems employing the RAID system.

One of the functions of a storage system that has realized high availability is a data transfer function between storage systems. For example, as described in US Pat. No. 5,680,640, data of an old storage system connected to a host computer is transferred to a storage system newly connected to the same host computer. This is a function to perform migration while receiving a read / write request for data of the old storage system from the server.

On the other hand, recently, for example, “Mainframe '98, Nikkei BP, issued on March 2, 1998, p.
p. 43-54 ", a system in which a storage device is built in a host computer has been developed.

[0005]

Here, in the conventional data transfer method between storage systems, a source storage system and a destination storage system are connected by a variable-length interface to issue a read / write request. Data transfer was being performed.

However, in data migration between the external storage system and the storage device built in the host computer, the system processor corresponding to the storage control device of the built-in storage device does not have a variable length interface.
There is a problem that the storage system cannot be connected to a storage system having a variable-length interface, data cannot be migrated from an external storage device to a storage device built in the host computer, and availability is low.

An object of the present invention is to transfer data from a storage device of an external storage system to a storage device incorporated in a host computer by transferring data from the host computer to data to be transferred stored in the storage device system. It is an object of the present invention to provide a computer system with improved availability that can execute while receiving a read / write request.

[0008]

In order to achieve the above object, the present invention comprises a storage system having a variable-length interface and a fixed-length format internal storage to which data of the storage system is migrated. A main storage for storing data migration management information for managing data migration from the storage system to the internal storage, and executing a read request to the internal storage. A system processor having a read processing unit and a write processing unit for executing a write request to the internal storage device, wherein the read processing unit or the write processing unit refers to the data migration management information, and If not, execute a read request or a write request to the storage system, and perform data migration. If the body is obtained so as to perform a read request or write request to the built-in storage device. With this configuration, data transfer from the storage device of the external storage device system to the storage device built in the host computer is performed, and a read / write request from the host computer to data to be transferred stored in the storage device system is issued. It can be executed while receiving it.

In order to achieve the above object, the present invention relates to a storage system having a variable-length interface and a host computer having a fixed-length format internal storage device to which data of the storage system is migrated. The host computer comprises a main memory for storing data migration management information for managing data migration from the storage system to the internal storage, and a read processing unit for executing a read request to the internal storage. A write processor for executing a write request to the internal storage device, the storage device system including a copy processing unit for copying data from the storage device system to the internal storage device, The copy processing unit copies data from the storage device system to the internal storage device. Both the read processing unit or the write processing unit refers to the data migration management information, if not already data migration executes a read request or write request to the storage system,
When data transfer has been completed, a read request or a write request is executed to the internal storage device. With this configuration, data transfer from the storage device of the external storage device system to the storage device built in the host computer is performed, and a read / write request from the host computer to data to be transferred stored in the storage device system is issued. It is possible to execute the program while receiving it, and to transfer the data without passing through the internal storage device cache memory area, thereby reducing the load on the system processor and the adapter connected to the internal storage device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A computer system according to a first embodiment of the present invention will be described below with reference to FIGS. First, the overall configuration of the computer system according to the present embodiment will be described with reference to FIG.

The host computer 1 comprises a main memory 11, an instruction processor 12 for executing an application, a system processor 13 for controlling the system, and a maintenance terminal 14.
And an input / output subsystem 15, which are connected to the system controller 16.

The input / output subsystem 15 has an input / output processor 151 for processing a read / write request and an adapter 152 serving as an interface with a lower order. The plurality of internal storage devices 17 and the plurality of storage device systems 2 are connected to the adapter 152. The adapter 152 is connected to the built-in storage device 17 through a fixed-length interface, and is connected to the storage device system 2 through a variable-length interface. The storage device system 2 includes a storage control device 21 and a storage device 22. Here, the storage system 2 is the data migration source, and the built-in storage device 17 is the data migration destination.

The system processor 13 includes: a read processing unit 131 that processes a read request to the internal storage device 17;
A write processing unit 132 that processes a write request to the internal storage device 17, a data migration processing unit 133 that executes data migration from the storage device system 2 that is a data migration source to the internal storage device 17 that is a data migration destination, A read / write request issuance processing unit 134 for issuing a read / write request of a variable length interface to the storage system 2, and a format conversion process for converting variable length data to fixed length data or converting fixed length data to variable length data And a unit 135. Read / write request issuance processing unit 134
Through the input / output processor 151 and directly activates the adapter 152 to which the internal storage device 17 is connected. The maintenance terminal 14 executes the data migration start processing unit 141 for instructing data migration, and receives a data migration completion report from the data migration processing unit 133.

The main memory 11 includes a host management information 111 which is management information of the host computer 1 and a built-in storage device 17 for managing a built-in storage device 17 including data migration management information 1121 which is information for executing data migration. Storage device management information 112 and built-in storage device cache memory area 113
Is provided. The details of the host management information 111 will be described later with reference to FIG. Details of the internal storage device management information 112 will be described later with reference to FIG.

The internal storage device management information 112 for managing the internal storage device 17 and the internal storage device cache memory area 113 are provided for each system processor 13. Further, the system processor 13 in charge of each built-in storage device 17 is uniquely determined.

Next, details of the host management information 111 in the main memory 11 of the computer system according to the present embodiment will be described with reference to FIG.

The host management information 111 has host logical device management information 1111 and read / write request management information 1112. The host logical device management information 1111 is provided for each of N host logical devices (# 0 to # (N-1)) defined inside the host computer. Each of the host logical device management information 1111 indicates O when the host logical device is expanded in the internal storage device 17.
It has a built-in storage device bit 11111 set to N, and storage destination storage device information 11112 for storing information on the entity of the storage device storing the host logical device. The host logical device defined in the internal storage device 17 as the data migration destination and having the substance of the data in the storage system 2 as the data migration source is the same as the host logical device developed in the internal storage device 17. The internal storage device bit 11111 is set to ON, and the storage destination storage device information 1 is set.
In 1112, the number of the built-in storage device 17 and the built-in storage device logical device number in the built-in storage device 17 are set. For the host logical device defined in the storage system 2 as the data migration source, the built-in storage device bit 11111 is set to ON, the storage destination storage device information 11112 is set to an initial value, and the When there is a read / write request from the processor 12, the system processor 13 responds with an error.

The read / write request management information 1112 includes:
It is composed of request management information 11121 for the storage system and request management information 11122 for the internal storage. The instruction processor 12 sends a read / write request
Referring to the internal storage device bit 11111 of the read / write request destination host logical device, if the request is for the internal storage device 17, the request management information 1112 for the internal storage device
If the request is for the storage system 2, it is registered in the request management information 11121 for the storage system. Further, the system processor 13 registers a read / write request to the storage system 2 in the request management information 11121 to the storage system.

Request management information 11122 to the internal storage device
Is referred to by the system processor 13 and the internal storage device 1
7 is read / written. The request management information 11121 for the storage system is referenced by the input / output processor 151 to execute read / write with the storage system 2.

Next, referring to FIG. 3, the internal storage device management information 11 of the main storage 11 of the computer system according to the present embodiment will be described.
2 will be described in detail. Internal storage device management information 11
2 includes data migration management information 1121, format conversion information 1122, built-in storage device read / write request management information 1123, and built-in storage device cache memory area management information 1124. The data migration management information 1121 includes data migration processing management information 11211 and data migration target internal storage logical device management information 11211.
12 and an internal storage device migration target bit 11213.

The data migration processing management information 11211 includes a data migration target presence / absence flag 112111, a data migration internal storage device number 112112, a data migration internal storage device logical device number 112113, a data migration logical track number 112114, It includes a data migration track number counter 112115 and a data migration track number threshold 112116. The data migration target presence / absence flag 112111 is turned ON when a data migration target internal storage logical device exists. The internal storage device number during data migration 112112 indicates the internal storage device number during data migration. The internal storage device logical device number during data migration 112113 indicates the internal storage device logical device number during data migration. Logical track number during data migration 112114 Indicates the logical track number during data migration. The data migration track number counter 112115 sets the data migration processing unit 133 to the read processing unit 131 and the write processing unit 1.
This is information for enabling temporary suspension so as not to have a significant influence on the number of tracks 32, and stores the total number of tracks transferred after the (re) start of the data transfer processing unit 133. The data migration track number threshold value 112116 is compared with the data migration track number counter 112115, and the data migration processing unit 1
This is for determining the temporary suspension of 33.

The data migration target internal storage device logical device management information 11212 includes the maximum number (L) of internal storage devices 17 assigned to the system processor 13 × the maximum number of logical devices (M devices) that can be defined in the internal storage device 17. ) Only prepared. The data migration target internal storage logical device management information 11212 includes the internal storage logical device migration target bit 112121 that is turned ON when the data is a data migration target, and the source storage that stores information of the storage system 2 that is the data migration source. The device information 112122 and the last track number 1 for the data migration processing unit 133 to determine the end of data migration of the internal storage logical device
12123.

Internal storage device migration target bit 11213
Is the internal storage device 1 in charge of the system processor 13.
The maximum number (L) of 7 is prepared, and is set to ON when the internal storage logical device for data migration is included.

The format conversion information 1122 stores information necessary for calculating the correspondence between the variable length format and the fixed length format. For example, if the cylinder number and head number of the variable-length format are converted into block numbers of the fixed-length format and are stored in continuous blocks of the fixed-length format for each track of the variable-length format, The block number of the fixed-length format corresponding to the head of the track specified by the track number and the number of blocks per track are as follows: number of blocks per track = <track size / block size> block number at the head of the track = (cylinder number × head) Number + head number) × the number of blocks per track. Here, <x> is a minimum integer greater than or equal to x. Number of heads, track size, built-in storage device 17
The block size and the like of the format conversion information 1122
See Furthermore, in order to determine the actual record position in the track from the record number in the variable length format,
Browse the contents of the track.

The internal storage device read / write request management information 1123 manages a read / write request from the system processor 13 to the internal storage device 17. The built-in storage device cache memory area management information 1124 manages the used / empty state of the built-in storage device cache memory area 113 and refers / updates the allocated / released state. The internal storage cache memory area management information 1124 is stored in the internal storage cache memory area 1 between the data migration processing unit 133, the read processing unit 131, and the write processing unit 132.
13 has information for exclusion of the data stored in it.

Next, referring to FIG. 4, the system processor 1 of the host computer 1 of the computer system according to the present embodiment will be described.
3 will be described. In step 500, the application executing instruction processor 12 generates a read / write request.

Next, in step 501, the instruction processor 12 refers to the internal storage device bit 11111 of the host logical device management information 1111 and determines whether the actual logical device to which the read / write request is issued is the internal storage device 17. Judge whether. In the case of the built-in device 17,
Proceed to step 502; otherwise, proceed to step 511. If it is the internal storage device 17, in step 502, the instruction processor 12 registers a read / write request in the request management information 11122 for the internal storage device.

Next, in step 503, the system processor 12 sends the request management information 11 to the internal storage device.
122, the storage destination of the internal storage device 17 (the system processor 13
If there are a plurality of built-in storage devices 17 in charge of the device, the number of built-in storage device 17 and the built-in storage device logical device number
To identify.

Then, in step 504, the system processor 13 determines whether or not the request is for the data transfer source storage system. Here, if the initial value is set in the storage destination storage device information 11112 and it is determined that the storage destination is the data migration source storage system 2, in step 509, the system processor 13
Makes the request an error and moves to step 510. On the other hand, if it is determined that the request is not a request to the storage system of the data migration source, in step 505, the system processor 13 determines whether the read / write request is read or write in command units. If it is a read, in step 506 the read processing unit 131
Executes a read process. The details of the read process will be described later with reference to FIG. If it is a write, in step 507, the write processing unit 1
32 executes a write process. The details of the write process will be described later with reference to FIG.

Next, in step 508, it is determined whether or not the next command exists.
Returning to step 505, the process is continued until all commands have been executed. When the execution of all commands is completed, in step 510, the system processor 13
Reports the end of the request to the read / write requesting application.

On the other hand, if it is determined in step 501 that the storage device is not the internal storage device 17, in step 511, the instruction processor 12 registers a read / write request in the request management information 11121 for the storage device system.
Next, in step 512, the input / output processor 15
1 issues a read / write request to the storage system 2 indicated by the storage destination storage device information 11112 by referring to the request management information 11121 for the storage system.

Next, in step 513, the storage system 2 executes a read / write request and reports the end of the request to the input / output processor 151. Finally, in step 514, the input / output processor 151 reports the end of the request to the application that issued the read / write request.

Next, data migration processing by the host computer 1 of the computer system according to the present embodiment will be described with reference to FIGS. The data migration process is executed by a data migration activation processing unit 141 that sets a data migration target and activates the data migration processing unit 133, and a data migration processing unit 133 that actually migrates data.

First, the processing of the data transfer start processing unit 141 executed by the maintenance terminal 14 will be described with reference to FIG. In step 520, the data migration activation processing unit 141 turns on the bit of the data migration destination for the internal storage device migration target bit 11213 and turns off the bit that is not the data migration destination.

Next, in step 521, the data migration start-up processing section 141 turns on the migration target bit 112121 of the data migration destination internal storage logical device management information 11212 and changes the migration source storage device information 112122. It is set and the migration target bit 112121 that is not the data migration destination is turned off. Next, in step 522, the data migration start-up processing unit 141 initializes the internal storage device number 112112 during data migration, the internal storage device logical device number 112113 during data migration, and the logical track number 112114 during data migration to 0. Become

Next, in step 523, the data transfer start processing unit 141 sets the data transfer
2111 is set to ON. Finally, step 524
, The data migration start processing unit 141 starts the data migration migration processing unit 133 of the system processor 13.

Next, the contents of processing executed by the data transfer processing unit 133 of the system processor 13 will be described with reference to FIG. In step 530, the data migration processing unit 133 sets the internal storage device number 1121 during data migration.
It is determined whether or not 12 exceeds the maximum value of the internal storage device number assigned to the system processor 13. If it has exceeded, the process proceeds to step 534; otherwise, the process proceeds to step 531.

If not, in step 531, the data migration processing unit 133 determines whether the internal storage device migration target bit 11213 is ON. If it is ON, the process proceeds to step 533, where
If not, the process proceeds to step 532. If it is not ON, in step 531 the data migration processing unit 133
Adds the internal storage device number 112112 during data migration, and proceeds to step 530. If it is ON, in step 533, the data migration processing unit 133 executes a data migration main process.

Here, the contents of the data migration main process executed by the data migration processor 133 of the system processor 13 will be described with reference to FIG. Step 54
At 0, the data migration processing unit 133 initializes the data migration track number counter 112115 with 0.

Next, in step 541, the data migration processing unit 133 determines whether the internal storage device logical device number 112113 during data migration exceeds the maximum value of the internal storage device logical device number. If it exceeds, the internal storage device number 112112 during data migration
Since the data transfer of the internal storage device 17 indicated by
The data migration main process ends.

If not, in step 542, the data migration processing unit 133 executes the data migration target internal storage device logical device management information 1 indicated by the current data migration internal storage device logical device number 112113.
121 internal storage logical device migration target bit 1
It is determined whether or not 12121 is ON. If it is not ON, in step 543, the data migration processing unit 133 adds the internal storage device logical device number 112113 during data migration because this internal storage device logical device is not a data migration target, and proceeds to step 541. If it is ON, in step 544, the data migration processing unit 133 sets the data migration track number counter 1
12115 is the data migration track number threshold value 112116
Is determined to be over.

If it exceeds, in step 545, the data migration processing unit 133 determines that the data migration main processing occupies the system processor 13 and the performance of the read processing unit 131 and the write processing unit 132 is reduced. To prevent this, the processing is temporarily suspended. Then, when the load on the system processor 13 is reduced, the processing is restarted, and the processing is executed again from step 540.

If not exceeded, in step 546, the data migration processing unit 133 issues a read request to the track indicated by the data-migrated logical track number 112114 to the data migration source storage device information 112122. Is issued by the read / write request issuance processing unit 134 to the storage system 2.

Next, in step 547, the data transfer source storage system 2 transfers the read request data to the internal storage cache memory area 113. At that time, the format conversion processing unit 135 converts the data from the variable length format to the fixed length format.
Next, in step 548, the data migration processing unit 13
3 is a transferred internal storage device cache memory area 1
13 is transferred to the internal storage device 17.

Next, in step 549, the data migration processing section 133 sets the data migration track number counter 11
2115, and in step 550,
The logical track number 112114 during data migration is added. Next, in step 551, the data migration processing unit 133 executes the data migration logical track number 112114.
Determines whether the last track number of the device has been exceeded. If not, the process proceeds to step 544. If it has exceeded, in step 552, the data transfer processing unit 133 initializes the logical track number 112114 during data transfer to 0. After the initialization, the process proceeds to step 543. Here, the data migration main process ends, and the process returns to step 532 in FIG.

Next, the processing after step 534 in FIG. 6 will be described. In step 534, the data migration processing unit 133 sets the data migration target presence / absence flag 11211
1 is turned OFF. Next, in step 535, the data migration processing unit 133
Issue a request to invalidate the data in the migration target range. Here, the read / write request issuance processing unit 134 may initialize the migration target range.

Next, in step 536, the migration source storage system 2 invalidates the data in the migration target range, and the data migration processing unit 133 receives a data invalidation end report. Finally, in step 537, the end of the data transfer processing unit 133 is reported to the maintenance terminal 14.

Next, the contents of processing of the read processing unit 131 executed by the system processor 13 of the computer system according to the present embodiment will be described with reference to FIG. In step 560, the read processing unit 131 determines whether the data migration target presence / absence flag 112111 is ON. If the data transfer object presence / absence flag 112111 is not ON, the process proceeds to step 566 because data transfer has not been executed.

When the data migration target presence / absence flag 112111 is ON, in step 561 the read processing unit 1
31 is a read request destination internal storage device migration target bit 1
It is determined whether 1213 is ON and the internal storage logical device migration target bit 112121 is ON. 2
If the two transfer target bits are not ON, the process proceeds to step 566 because the read request destination is not the data transfer target.

If the two migration target bits are ON, in step 562, the read processing unit 131 determines whether the data has been migrated. If the data has not been migrated, the process proceeds to step 563. Goes to step 566. Here, it is determined that the data has not been migrated in the read request data because 1) the internal storage device number is larger than the internal storage device number 112112 during data migration, or 2) the internal storage device number is internal during the data transfer. The same as the storage device number 112112, and the internal storage device logical device number is larger than the internal storage device logical device number 112113 during data migration, or 3) the internal storage device number is the same as the internal storage device number 112112 during data migration. And the logical device number of the internal storage device is the same as the logical device number 112113 during data migration, and the track number of the read request data is the logical track number 112 during data migration.
This is the case where it satisfies 114 or more.

If the data has not been migrated, in step 563, the read processing unit 131 refers to the internal storage cache memory area management information 1124 and stores the read request data in the internal storage cache memory area 11.
3 is determined. If stored, the process proceeds to step 568; otherwise, the process proceeds to step 564. If not,
In step 564, the read processing unit 131 specifies the source storage system 2 based on the source storage device information 112122. Next, in step 565,
The read / write request issuance processing unit 134 issues a read request to the source storage system 2, and the read processing unit 131 sends the read request data from the source storage system 2 to the internal storage cache memory area 113. Transfer the entire track, including. The storage location of the read request data in the internal storage device cache memory area 113 is
It is assumed that it is determined in advance by the format conversion processing unit 135.

If the data has been migrated, step 56
In 6, the read processing unit 131 refers to the internal storage cache memory area management information 1124 and determines whether or not the read request data is stored in the internal storage cache memory area 113. If it is not stored, the process proceeds to step 567, and if it is stored,
Proceed to step 568. If it is not stored, in step 567, the read processing unit 131 sends the data from the internal storage device 17 to the internal storage device cache memory area 113.
The entire track including the read request data is transferred. Finally, in step 568, the read processing unit 131
Copies the read request data from the internal storage device cache memory area 113 to the main storage area of the read request source. The determination of the data to be transferred is performed by the format conversion processing unit 135 with reference to the contents of the track.

Next, the contents of processing of the write processing unit 132 executed by the system processor 13 of the computer system according to the present embodiment will be described with reference to FIG. In step 570, the write processing unit 132 determines whether the data migration target presence / absence flag 112111 is ON. If the data transfer target presence / absence flag 112111 is not ON, the process proceeds to step 578 because data transfer has not been executed.

When the data migration target presence / absence flag 112111 is ON, in step 571, the write processing unit 1
32 is a write request destination internal storage device migration target bit 1
It is determined whether 1213 is ON and the internal storage logical device migration target bit 112121 is ON. 2
If one of the transfer target bits is not ON, the process proceeds to step 578 because the write request destination is not the data transfer target.

If the two migration target bits are ON, in step 572, the write processing unit 132 determines whether or not the data has been migrated. If the data has not been migrated, the process proceeds to step 573. If the data has been migrated, the process proceeds to step 573. Goes to step 578.

If the data has not been migrated, in step 573, the write processing unit 132 uses the source storage device information 112122 to store the source storage system 2
To identify. Then, in step 574, the write processing unit 132 determines whether or not the read for specifying the write position is necessary. This is because the record position in the track may not be able to be calculated in advance because the write request data has a variable length format. Then, if necessary, proceed to step 575,
Otherwise, go to step 576.

If a write position specific read is required, in step 575, the write processing unit 132
The entire track including the write request data is transferred from the source storage system 2 to the internal storage cache memory area 113. At this time, the read / write request issuance processing unit 134 issues a read request to the migration source storage system 2, and the storage destination of the read request data in the internal storage device cache memory area 113 is the format conversion processing unit. It is determined in advance by 135.

Next, in step 576, the write processing unit 132 copies the write request data from the write request source main storage area to the internal storage cache memory area 113. Internal storage device cache memory area 113
The storage destination of the read request data is determined in advance by the format conversion processing unit 135. Finally, in step 577, the write processing unit 1
Reference numeral 32 transfers the write request data from the internal storage cache memory area 113 to the storage system 2 of the migration source. Issuance of a write request to the migration source storage system 2 is executed by the read / write request issuance processing unit 134,
The data to be transferred is determined by the format conversion processing unit 13.
5 executes with reference to the contents of the track.

On the other hand, if it is determined in step 572 that the data has been migrated, in step 578, the write processing unit 132 determines whether or not a read for specifying the write position is necessary. When the read for specifying the write position is not required, the process proceeds to step 580. When the read for specifying the write position is required, the process proceeds to step 579. If it is necessary to read the write position, in step 579, the write processing unit 132 transfers the entire track including the write request data from the internal storage device 17 to the internal storage device cache memory area 113.

Next, in step 580, the write processing unit 132 copies the write request data from the write request source main storage area to the internal storage cache memory area 113. Next, in step 581, the write processing unit 132 sets the internal storage device cache memory area 11
3 transfers the write request data to the internal storage device 17.

Next, in step 582, the write processing unit 132 determines that the write request destination internal storage device migration target bit 11213 is ON, the internal storage device logical device migration target bit 112121 is ON, and the data migration is performed. It is determined whether or not it has been completed. If the condition is not satisfied, the write processing unit is terminated. If the condition is satisfied, the process proceeds to step 583. If the condition is satisfied, in step 583, the write processing unit 132 sets the source storage device information 1 in order to maintain the consistency of the data migration range between the data storage source storage system 2 and the internal storage device 17.
In step 12122, the migration source storage system 2 is specified. Finally, in step 584, the write processing unit 132 sets the internal storage device cache memory area 1
13 transfers the write request data to the transfer source storage system 2.

As described above, in this embodiment, the data read / write processing is performed by the read processing unit or the write processing unit by referring to the data migration management information as shown in FIG. If not,
A read request or a write request is executed to the storage system, and when data has been migrated, a read request or a write request is executed to the built-in storage device. The data migration to the storage device built in the host computer can be executed while receiving a read / write request from the host computer to the migration target data stored in the storage device system.

More specifically, the data migration process
As described in FIGS. 6 and 7, the internal storage device 1
Asynchronously with the read / write request to the H.7, the data migration management information 1121 is referenced to determine a data migration target area that has not been migrated, and issue a read request to the storage system 2 by a read / write request issuance process. Then, the read request data is stored in the internal storage cache memory area 113 in a format determined by the format conversion process, the data is transferred from the internal storage cache memory area to the internal storage, and the data of the data transfer management information 1121 is transferred. The area is changed when the data has been migrated. In the read process, as described with reference to FIG. 8, when a read request to the internal storage device 17 occurs, the data transfer management information 1121 is referenced to determine whether the read request data is a data transfer target and data transfer has not been completed. If the condition is satisfied, a read request is issued to the storage device system 2 by a read / write request issuance process, and the read request data is stored in the internal storage device cache memory area 1 in a format determined by the format conversion process.
13 and transferred to the read request source in a format determined by the format conversion process. If the condition is not satisfied,
The read request data is transferred from the internal storage device 17 to the internal storage device cache memory area 113, and is transferred to the read request source in a format determined by the format conversion process. Further, as described with reference to FIG. 9, when a write request to the internal storage device 17 occurs, the write process refers to the data migration management information 1121 to determine whether the write request data is a data migration target and has not been migrated. When the condition is satisfied, the write request data is stored in the internal storage device cache memory area 113 in a format determined by the format conversion process after the write request data is prepared to be stored in the internal storage device cache memory. Issue a write request to the storage system 2 by a read / write request issuance process, transfer write request data from the internal storage cache memory area to the storage system in a format determined by the format conversion process, and the condition is not satisfied. Format the write request data from the write request source Built-in storage device in a format conversion process to determine a cache memory area 1
13 and transferred to the internal storage device 17. Since the data migration process and the data read / write process are performed as described above, the data migration from the storage device of the external storage system to the storage device built in the host computer is performed. It can be executed while receiving a read / write request for data to be migrated stored in the storage device system.

In the write processing shown in FIG.
When a write request to the built-in storage device occurs, if the write request data is a data transfer target and data transfer has been completed, the write request data is stored in the storage system of the data transfer source in step 584. ,
Data consistency between data migration source and migration destination can be obtained.

Further, in the data transfer processing shown in FIG.
Since data in the migration range of the storage system of the data migration source is invalidated, data security can be improved.

Further, in the data migration start processing shown in FIG. 5 and the data migration processing shown in FIG.
Since the determination of the data migration range and the execution instruction of the data migration process in 0 to 524 and the reception of the execution result of the data migration process in step 536 are performed by the maintenance terminal connected to the host computer, the normal read operation is performed. The data migration process can be executed independently of the / write process.

Next, a computer system according to the second embodiment of the present invention will be described with reference to FIGS. Note that the overall configuration of the computer system according to the present embodiment is the same as that shown in FIG. Further, the host management information 1 in the main memory 11 of the computer system according to the present embodiment.
The details of 11 are the same as those shown in FIG. Further, details of the internal storage device management information 112 of the main storage 11 of the computer system according to the present embodiment are the same as those shown in FIG. 3, but are included in the data migration management information 1121 of the internal storage device management information 112. The data migration target internal storage logical device management information 11212 is partially different from that shown in FIG. 3, and this point will be described with reference to FIG. The read / write processing by the system processor 13 of the host computer 1 of the computer system according to the present embodiment is the same as that shown in FIG.
Further, the details of the data migration processing by the maintenance terminal of the computer system according to the present embodiment are the same as those shown in FIGS. 5 and 6, but a part of the processing in FIG. 5 is different.
This will be described with reference to FIG. The data migration main processing by the system processor of the computer system according to the present embodiment is the same as that shown in FIG. 7, but is partially different, and this point will be described with reference to FIG. . Further, the read processing executed by the system processor of the computer system according to the present embodiment is the same as that shown in FIG. 8, but is partially different, and this point will be described with reference to FIG. . The write processing executed by the system processor of the computer system according to the present embodiment is the same as that shown in FIG. 9, but is partially different, and this point will be described with reference to FIG. .

First, referring to FIG. 10, the data migration target internal storage logical device management information 11212 in the data migration management information 1121 of the internal storage management information 112 of the main storage 11 of the computer system according to the present embodiment will be described. Details will be described. The same reference numerals as those in FIG. 3 indicate the same parts.

The data migration target internal storage device logical device management information 11212 is defined as the maximum number (L) of internal storage devices 17 assigned to the system processor 13 × the maximum number of logical devices (M devices) that can be defined in the internal storage device 17. ) Only prepared.

As shown in FIG. 10, the data migration target internal storage logical device management information 11212 is
The internal storage device logical device migration target bit 112121 which is turned ON when the data is the data migration target shown in FIG.
And the source storage device information 112122 for storing information of the storage system 2 of the data source, and the last track number 112123 for the data migration processing unit 133 to determine the end of data migration of the internal storage logical device. In addition, for all tracks (# 0 to # (final track number)), track-transferred bits 11212
4 are provided.

Next, the processing of the data migration start-up processing unit 141 executed by the maintenance terminal 14 will be described with reference to FIG. The same reference numerals as those in FIG. 5 indicate the same processes. In the present embodiment, the processing of step 600 is executed instead of step 521 of FIG.

Next, in step 600, the data migration start processing section 141 turns on the migration target bit 112121 of the data migration destination internal storage logical device management information 11212 and changes the migration source storage device information 112122. This is set, the transfer target bit 112121 that is not the data transfer destination is turned off, and the track transfer completed bit 11214 of the data transfer destination is all turned off.

Next, the contents of the data migration main processing executed by the data migration processing unit 133 of the system processor 13 will be described with reference to FIG. The same reference numerals as those in FIG. 7 indicate the same processes. In the present embodiment, the processing of step 610 is added after the processing of step 544 shown in FIG. 7, and the processing of step 611 is added after the processing of step 549 shown in FIG.

If the data migration track counter 112115 does not exceed the data migration track number threshold value 112116 in the determination at step 544, the data migration processing unit 133 proceeds to step 610 with the data migration logical track number 112114. It is determined whether the track transfer completed bit 112124 of the indicated track is ON. If it is ON, the process proceeds to step 550, and if it is OFF, the process proceeds to step 546. OFF
In the case of, the data migration processing unit 133 executes data migration in steps 546 to 549. Then, in step 611, the data transfer processing unit 133 sets the track transfer completed bit 112124 to ON.
Thereafter, steps 550 and 551 are executed.

Next, the contents of processing of the read processing unit 131 executed by the system processor 13 of the computer system according to the present embodiment will be described with reference to FIG. In addition,
The same reference numerals as those in FIG. 8 indicate the same processes. In the present embodiment, the processing of step 620 is executed instead of the processing of step 562 shown in FIG.
63 as well as step 565 shown in FIG.
Steps 621, 568, 622, 6
23 is executed.

In step 561, if the internal storage device migration target bit 11213 and the internal storage device logical device migration target bit 112121 of the read request destination are ON, in step 620, the read processing unit 131
Determines whether the data has been migrated. If the data has not been migrated, the process proceeds to step 564. If the data has been migrated, the process proceeds to step 566. Here, it is determined that the data has not been migrated based on whether or not the track migrated bit 112124 corresponding to the track of the read request data is OFF.

If data has not been migrated, step 56
In 4, the read processing unit 131 specifies the source storage system 2 based on the source storage device information 112122. Next, in step 621, the read processing unit 131 always transfers the entire track including the read request data from the source storage system 2 to the internal storage cache memory area 113.

Next, in step 622, the read processing unit 131 sets the internal storage device cache memory area 11
3 transfers the entire track including the read request data to the internal storage device 17. Further, in step 623, the read processing unit 131 sets the track transfer completed bit 112124 of the track including the read request data to ON.

Next, the contents of processing of the write processing unit 132 executed by the system processor 13 of the computer system according to the present embodiment will be described with reference to FIG. In addition,
The same reference numerals as those in FIG. 9 indicate the same processes. In the present embodiment, the processing of step 630 is executed instead of the processing of step 572 shown in FIG.
Instead of the processing of steps 74 and 575, the processing of step 631 is executed. After the processing of step 576 in FIG. 9, step 632 is executed. After the processing of step 577 in FIG.
Step 633 is executed, and the process of step 634 is executed instead of the process of step 582 in FIG.

If the write request destination internal storage device migration target bit 11213 and internal storage device logical device migration target bit 112121 at the write request destination are ON in step 571, the write processing unit 132
Determines whether the data has been migrated. If the data has not been migrated, the process proceeds to step 573. If the data has been migrated, the process proceeds to step 578. Here, it is determined that the data has not been migrated based on whether or not the track migrated bit 112124 corresponding to the track of the read request data is OFF.

If the data has not been migrated, in step 573, the write processing unit 132 uses the source storage device information 112122 to store the source storage system 2
To identify. Next, in step 631, the write processing unit 132 omits the determination of the necessity of read for specifying the write position, and transfers the entire track including the write request data from the source storage system 2 to the internal storage cache memory area 113. Forward.

Next, in step 576, the write processing unit 132 copies the write request data from the write request source main storage area to the internal storage cache memory area 113. Internal storage device cache memory area 113
The storage destination of the read request data is determined in advance by the format conversion processing unit 135. Next, in step 632, the write processing unit 13
2 transfers the entire track including the write request data from the internal storage cache memory area 113 to the internal storage 17.

Next, in step 577, the write processing unit 132 sets the internal storage device cache memory area 11
3 to the transfer source storage system 2. The read / write request issuance processing unit 134 issues a write request to the migration source storage system 2, and the format conversion processing unit 135 determines the data to be transferred with reference to the contents of the track. . Finally, in step 633, the write processing unit 132
The track transfer completed bit 112124 of the track including the write request data is set to ON.

On the other hand, after step 581, step 63
In 4, the write processing unit 132 determines that the write request destination internal storage device migration target bit 11213 is ON, and
Internal storage logical device migration target bit 112121
Is ON and data migration has been completed. If the condition is not satisfied, the write processing unit is terminated. If the condition is satisfied, the process proceeds to step 583.

As described above, according to the present embodiment, similarly to the first embodiment, the data migration from the storage device of the external storage system to the storage device built in the host computer is performed by the host computer. This can be executed while receiving a read / write request for data to be migrated stored in the storage device system from.

When the data transfer management information has a track number during data transfer and the track number of the read / write request data is equal to or larger than the track number during data transfer, a read / write request is sent to the storage system. In this case, data transfer can be performed for each track. .

Further, as the data transfer management information, a track transferred bit for each track is provided, and for a read / write request to a track whose track transferred bit is OFF, data of the entire track is transferred from the storage system to the internal storage device. Since the data is stored in the cache memory area, the read / write request is processed, and the entire track is transferred to the built-in storage device, there is a read / write request for data within the data transfer range and for which data has not been transferred. In this case, the data migration time can be reduced by executing the data migration in the read process or the write process and omitting the data migration in the data migration main process.

Next, a computer system according to the third embodiment of the present invention will be described with reference to FIGS. Note that the overall configuration of the computer system according to the present embodiment is the same as that shown in FIG. 1, but is partially different, so that the point will be described with reference to FIG.
The details of the host management information 111 in the main memory 11 of the computer system according to the present embodiment are the same as those shown in FIG. Further, details of the internal storage device management information 112 of the main storage 11 of the computer system according to the present embodiment are the same as those shown in FIG. 3, but are included in the data migration management information 1121 of the internal storage device management information 112. The data migration processing management information 11211 is partially different from that shown in FIG. 3, and this will be described with reference to FIG. The read / write processing by the system processor 13 of the host computer 1 of the computer system according to the present embodiment is the same as that shown in FIG. Further, the details of the data transfer processing by the maintenance terminal of the computer system according to the present embodiment are the same as those shown in FIGS. The data migration main processing by the system processor of the computer system according to the present embodiment is the same as that shown in FIG. 7, but is partially different. . Further, the read processing executed by the system processor of the computer system according to the present embodiment is the same as that shown in FIG. 8, but a part thereof is different.
8 will be described. Further, the write processing executed by the system processor of the computer system according to the present embodiment includes:
It is the same as that shown in FIG. 9, but a part is different, and the point is the same as FIG.

First, the overall configuration of the computer system according to the present embodiment will be described with reference to FIG. In addition,
The same reference numerals as those in FIG. 1 indicate the same parts. The host computer 1 includes a main memory 11, an instruction processor 12 for executing an application, a system processor 13 for controlling a system, a maintenance terminal 14, and an input / output subsystem 1.
5 and these are the system controller 16
It is connected to the.

Adapter 152 of input / output subsystem 15
Are connected to a plurality of built-in storage devices 17 and a plurality of storage device systems 2. The adapter 152 is connected to the built-in storage device 17 through a fixed-length interface, and is connected to the storage device system 2 through a variable-length interface.
The storage device system 2 includes a storage control device 21 and a storage device 22. Here, the storage system 2 is the data migration source, and the built-in storage device 17 is the data migration destination.

Further, the source storage system 2 having a fixed-length interface, a copy processing unit 211 in the storage controller 21 and a fixed-length format storage device 22 is the same as the destination internal storage device 17. Connect to the bus.

The system processor 13 is provided with a copy request issuance processing section 136. FIG.
The read / write request issuance processing unit 134 shown in (1) becomes unnecessary because the source storage system 2 has a fixed length interface.

In the data migration start processing section 141, the migration source storage system information 112112, which is connected to the same bus as the migration destination internal storage device 17,
The information on the fixed-length interface is set, and the request issuance to the source storage system 2 is executed via the internal storage device read / write request management information 1123.

As shown in FIG. 1, when data is transferred via the internal storage device cache memory area 113, the data transfer processing unit 133 and the read processing unit 13
Exclusivity of data operation between the write processing unit 1 and the write processing unit 132 is provided in the internal storage cache memory area management information 1124. However, as in the present embodiment, when the function of migrating data is transferred to the source storage system 2 and the data is transferred without passing through the internal storage cache memory area 113, the internal storage cache memory area management information 1124 is used. Cannot be mutually exclusive.

Next, referring to FIG. 16, the internal storage device management information 11 of the main storage 11 of the computer system according to the present embodiment will be described.
The details of the data migration processing management information 11211 of the second data migration management information 1121 will be described. The data migration processing management information 11211 includes a data migration target presence / absence flag 112111, a data migration internal storage device number 112112, a data migration internal storage device logical device number 112113, and a data migration logical track number 112114 shown in FIG. And data migration track number counter 1
12115 and data migration track number threshold value 112116
In addition to the above, a copy process execution flag 112117 is provided.

Next, the contents of the data migration main processing executed by the data migration processing unit 133 of the system processor 13 will be described with reference to FIG. The same reference numerals as those in FIG. 7 indicate the same processes. In the present embodiment, the processing of steps 650 to 655 is executed instead of the processing of steps 546, 547, and 548 shown in FIG.

In step 544, the data migration processing section 133 sets the data migration track number counter 11211
If the data migration processing unit 133 determines that the copy request does not exceed the data migration track number threshold value 112116, the data migration processing unit 133 proceeds to step 650, immediately before issuing the copy request to the migration source storage system 2, Turn ON 112117. Next, in step 651, the data transfer processing unit 133 determines that the data of the track for which data transfer is to be executed
It is checked by referring to the internal storage cache memory area management information 1124 whether it is used by the write processing unit 132. If used, wait until released.

Next, in step 652, when migrating data from the source storage system 2 to the internal storage device 17, the data migration processing unit 133 executes the copy request issuance processing unit 136, 2 is issued a copy request. Next, in step 653, the data migration processing unit 133 continues to execute the data migration processing unit 1 until the migration source storage system 2 reports a copy end.
33 is interrupted and the system processor 13 is released.

Next, in step 654, the data migration processing unit 133 receives a copy completion report from the migration source storage system 2 after the copy is completed. Then, in step 655, after receiving the copy completion report, the data migration processing unit 133 sets the copy process execution flag 112
117 is turned off. After that, the processing after step 549 is executed.

Next, the contents of the read processing executed by the read processing unit 131 of the system processor 13 will be described with reference to FIG. The same reference numerals as those in FIG. 8 indicate the same processes. In the present embodiment, the processing of step 660 is added between step 562 and step 563 shown in FIG.

In step 562, the read processing unit 1
If it is determined that the data has not been migrated, the read processing unit 131 proceeds to step 660, where the internal storage device number 112112 during data migration, the logical storage device number 112113 during data migration, and the logical track number 112114 during data migration are read. Matches the requested data,
In addition, it is determined whether or not the track including the read request is in the process of executing the copy process, based on whether or not the copy in progress flag 112117 is ON. If the copy process is being executed, the process waits until the copy process of the track including the requested data ends. Then, when the copy processing is completed, the process proceeds to step 563.

Although the above is a description of the read processing, the write processing is similarly performed by adding the processing of step 660 in FIG. 18 between steps 572 and 573 in FIG. Wait for the copy processing of the track containing the data to end.

As described above, according to the present embodiment, similarly to the first embodiment, the data migration from the storage device of the external storage system to the storage device built in the host computer is performed by the host computer. This can be executed while receiving a read / write request for data to be migrated stored in the storage device system from.

Further, the storage device system includes a copy processing unit for copying data from the storage device system to the internal storage device. By executing data migration by the copy processing unit, the data is transferred without passing through the internal storage device cache memory area. By migrating the data, it is possible to reduce the load on the adapter connected to the system processor and the internal storage device, and to save the used area of the internal storage device cache memory area.

[0105]

According to the present invention, data migration from a storage device of an external storage system to a storage device incorporated in a host computer is performed by using data to be migrated stored in the storage system from the host computer. It can be executed while receiving a read / write request to the.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a computer system according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing details of host management information in a main memory of the computer system according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing details of internal storage device management information of a main storage of the computer system according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a flow of read / write processing by a system processor of the computer system according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a flow of data migration processing by a maintenance terminal of the computer system according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing a flow of data migration processing by a system processor of the computer system according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing a flow of data migration main processing by a system processor of the computer system according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing a flow of a read processing unit executed by a system processor of the computer system according to the first embodiment of the present invention.

FIG. 9 is a flowchart showing a flow of a write processing unit executed by a system processor of the computer system according to the first embodiment of the present invention.

FIG. 10 is an explanatory diagram showing details of the data migration target internal storage logical device management information in the data migration management information of the internal storage management information of the main storage of the computer system according to the second embodiment of the present invention. .

FIG. 11 is a flowchart illustrating a flow of a data migration process by a maintenance terminal of the computer system according to the second embodiment of the present invention.

FIG. 12 is a flowchart illustrating a flow of a data migration main process performed by a system processor of a computer system according to the second embodiment of the present invention.

FIG. 13 is a flowchart illustrating a flow of a read processing unit executed by a system processor of a computer system according to the second embodiment of the present invention.

FIG. 14 is a flowchart illustrating a flow of a write processing unit executed by a system processor of a computer system according to the second embodiment of the present invention.

FIG. 15 is a block diagram showing an overall configuration of a computer system according to a third embodiment of the present invention.

FIG. 16 is an explanatory diagram showing details of the data migration processing management information of the data migration management information of the internal storage device management information of the main storage of the computer system according to the first embodiment of the present invention.

FIG. 17 is a flowchart illustrating a flow of a data migration main process performed by the system processor of the computer system according to the third embodiment of the present invention.

FIG. 18 is a flowchart illustrating a flow of a read process performed by a system processor of a computer system according to the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Host computer 11 ... Main memory 112 ... Data migration management information 113 ... Internal storage device cache memory area 13 ... System processor 131 ... Read processing unit 132 ... Write processing unit 133 ... Data migration processing unit 134 ... Read / write request issue processing Unit 135 Format conversion processing unit 136 Copy request issue processing unit 14 Maintenance terminal 141 Data migration start-up processing unit 17 Internal storage device 2 Storage device system 211 Copy processing unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasutomo Yamamoto 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Inside System Development Laboratory, Hitachi, Ltd. 5B005 JJ01 KK12 MM11 NN01 NN11 NN71 NN71 5B065 CA12 CC08 CH01

Claims (5)

[Claims] 1. A storage system having a variable-length interface, and a host computer having a fixed-length format internal storage device to which data of the storage system is migrated, wherein the host computer comprises the storage device system Main storage for storing data migration management information for managing data migration from the internal storage device to the internal storage device, a read processing unit for executing a read request to the internal storage device, and executing a write request to the internal storage device And a read processor or a write processor, wherein the read processor or the write processor refers to the data migration management information and, if the data has not been migrated, performs a read request or a write to the storage device system. Execute the request, and if the data has been migrated, read request It is properly computer system and executes a write request. 2. The computer system according to claim 1, further comprising a maintenance terminal for determining a data migration range, instructing execution of said data migration process, and receiving a result of execution of said data migration process. Computer system. 3. The computer system according to claim 1, wherein the read processing unit or the write processing unit is configured such that the data migration target presence / absence flag in the data migration management information is ON, and the read / write request data is The internal storage device data migration target bit of the internal storage device number is ON, and the device data migration target bit of the device number of the read / write request data is ON.
If 1) the internal storage device number of the read / write request data is larger than the internal storage device number during the data migration, or 2) the internal storage device number of the read / write request data is the internal storage device during the data migration The device number is the same as the device number, and the device number of the read / write request data is larger than the device number during the data transfer, or 3) the internal storage device number of the read / write request data is the internal storage device number during the data transfer And the device number of the read / write request data is the same as the device number under data transfer, and the track number of the read / write request data is equal to or greater than the track number under data transfer. A computer system for executing a read / write request with the storage system. . 4. The computer system according to claim 1, wherein
The read processing unit or the write processing unit has a track-transferred bit for each track, and the read processing unit or the write processing unit transmits data of the entire track from the storage device system to the internal storage in response to a request for a track whose track-transferred bit is OFF. Stored in the device cache memory area,
A computer system for processing a read / write request and transferring an entire track to the internal storage device. 5. A storage system having a variable-length interface, and a host computer having a fixed-length format internal storage device to which data of the storage system is migrated, wherein the host computer comprises the storage device system Main storage for storing data transfer management information for managing data transfer from the internal storage device to the internal storage device, a read processing unit for executing a read request to the internal storage device, and executing a write request to the internal storage device A system processor having a write processing unit; and the storage device system includes a copy processing unit that copies data from the storage device system to the built-in storage device. Copy data to the device and read or write the data The processing unit refers to the data migration management information, executes a read request or a write request to the storage device system if the data migration has not been completed, and if the data migration has been completed, executes the internal storage device A read request or a write request to the computer system.