DATA MIGRATION MANAGEMENT APPARATUS AND INFORMATION PROCESSING SYSTEM

• US 20100293412A1
• Filed: 06/29/2009
• Published: 11/18/2010
• Est. Priority Date: 05/13/2009
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: YAMAKAWA, Hiroshi, SAKAGUCHI, Akihiko
• Granted Patent: US 8,205,112 B2
• Time in Patent Office: Days
• US Class Current: 714/17
• CPC Class Codes: G06F 11/0715 in a system implementing multitasking multitasking per se G06F9/46
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/0775 Content or structure details of the error report, e.g. specific table structure, specific error fields
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 11/1497 Details of time redundant execution on a single processing unit
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

The present invention provides a data migration management apparatus that can easily create a re-execution task for re-executing an error-terminated data migration task, and also can increase the possibility of the re-execution task being successful. In a case where a data migration from a migration-source volume to a migration-destination volume fails, the management apparatus uses the information of the failed task to create a re-execution task. The management apparatus changes the configuration of a volume pair as necessary. The management apparatus manages the failed task in association with the re-execution task.

Claims

1. A data migration management apparatus for managing a data migration inside a data processing system that comprises a plurality of storage areas, comprising:

a memory storing an execution plan for migrating data from a migration-source storage area, which is included in the storage areas, to a migration-destination storage area, which is included in the storage areas;

a microprocessor creating, managing and executing the execution plan stored in the memory; and

a communication interface for the microprocessor to communicate via a communication network with a storage controller for controlling the storage areas,

wherein the microprocessor migrates the data from the migration-source storage area to the migration-destination storage area by;

(1) creating the execution plan and storing the plan in the memory;

(2) migrating the data from the migration-source storage area to the migration-destination storage area by issuing an instruction based on the execution plan to the storage controller via the communication network;

(3) determining whether the execution plan was completed as planned or failed;

(4) using the information included in the execution plan to create a re-execution plan in a case where the execution plan is determined to have failed;

(5) storing the re-execution plan in the memory in association with the execution plan; and

(6) issuing a separate instruction based on the re-execution plan to the storage controller via the communication network.

2. The data migration management apparatus according to claim 1,

wherein history information related to a data migration executed inside the information processing system is also stored in the memory, and

wherein the microprocessor estimates a migration completion time required to complete either the execution plan or the re-execution plan based on the history information stored in the memory, and outputs the estimated migration completion time in association with either the execution plan or the re-execution plan.

3. The data migration management apparatus according to claim 2,

wherein an execution result of the execution plan is reflected in the history information, and

wherein the microprocessor estimates the migration completion time of the re-execution plan based on the history information in which the execution result of the execution plan has been reflected.

4. The data migration management apparatus according to claim 1, wherein in a case where the execution plan failed, the microprocessor creates the re-execution plan by changing either the migration-source storage area or the migration-destination storage area, or both, to a different storage area in accordance with the reason for the failure.

5. The data migration management apparatus according to claim 4,

wherein a failure reason table, which stipulates beforehand whether or not a retry is possible for the each failure reason, is stored in the memory, and

wherein the microprocessor determines whether or not the failure reason for the execution plan is a retryable failure reason by referencing the failure reason table, and in a case where the failure reason for the execution plan is set as being non-retryable, creates the re-execution plan by changing either the migration-source storage area or the migration-destination storage area, or both, to the different storage area.

6. The data migration management apparatus according to claim 4, wherein the microprocessor selects the different storage area from among the storage areas based on an attribute of the storage area to be a change target, of the migration-source storage area and the migration-destination storage area.

7. The data migration management apparatus according to claim 1,

wherein history information related to a data migration executed inside the information processing system is also stored in the memory, and

wherein, in a case where the execution plan failed, the microprocessor determines whether or not it is possible to re-select the migration-source storage area and the migration-destination storage area included in the execution plan to create a re-execution plan,

wherein, when the migration-source storage area and the migration-destination storage area are determined to be re-selectable, the microprocessor estimates, on the basis of the history information, a migration completion time required to complete the data migration from the migration-source storage area to the migration-destination storage area, and

wherein, when the estimated migration completion time corresponds to a preset prescribed change condition, the microprocessor changes the migration-destination storage area to a different storage area included in the storage areas.

8. The data migration management apparatus according to claim 7, wherein the microprocessor selects, as the different storage area, a storage area having either the same or similar attributes as the migration-destination storage area which is a change target.

9. The data migration management apparatus according to claim 7,

wherein the prescribed change condition is either one or a plurality of:

a case where the migration completion time estimated this time is a first prescribed value or longer than a previously estimated migration completion time for the execution plan that failed;

a case where the time required from the start to failure of the execution plan is a second prescribed value or longer than the previously estimated migration completion time for the execution plan; and

a case where, when a plurality of data migration pairs configured from the migration-source storage area and the migration-destination storage area are included in the execution plan, the migration completion time estimated for either one of the data migration pairs is a third prescribed value or longer than the migration completion time estimated for the other data migration pairs.

10. The data migration management apparatus according to claim 1,

wherein a plurality of data migration pairs configured from the migration-source storage area and the migration-destination storage area are included in the execution plan, and

wherein the microprocessor determines that the execution plan failed in a case where a data migration has failed for either one of the data migration pairs included in the execution plan, and

wherein the microprocessor uses information that is used in setting the data migration pair for which the data migration failed of the respective data migration pairs included in the execution plan that failed, to create a re-execution plan for completing the data migration of the data migration pair for which the data migration failed.

11. The data migration management apparatus according to claim 1,

wherein an execution plan management table for storing the execution plan and the re-execution plan created by the microprocessor is also stored in the memory, and

wherein an identifier for identifying the execution plan and an identifier for identifying the re-execution plan are set in the execution plan management table so as to differ from one another.

12. The data migration management apparatus according to claim 1, wherein in a case where the re-execution plan has been associated with the execution plan that failed, the microprocessor prohibits the creation of another execution plan related to the execution plan.

13. An information processing system, comprising:

a data migration management apparatus for managing a data migration; and

a plurality of storage controllers, which are connected to the data migration management apparatus via a communication network, and which each has a plurality of storage areas,

wherein the data migration management apparatus has;

a memory storing an execution plan for migrating data from a migration-source storage area, which is included in the respective storage areas, to a migration-destination storage area, which is included in the respective storage areas;

a microprocessor creating, managing and executing the execution plan stored in the memory; and

a communication interface for the microprocessor to communicate via the communication network with the storage controllers, and

wherein the microprocessor migrates the data from the migration-source storage area to the migration-destination storage area by;

(1) creating the execution plan and storing the plan in the memory;

(2) migrating the data from the migration-source storage area to the migration-destination storage area by issuing an instruction based on the execution plan to the storage controllers via the communication network;

(3) determining whether the execution plan was completed as planned or failed;

(4) using the information included in the execution plan to create a re-execution plan in a case where the execution plan is determined to have failed;

(5) storing the re-execution plan in the memory in association with the execution plan; and

(6) issuing a separate instruction based on the re-execution plan to the storage controllers via the communication network.

14. The information processing system according to claim 13,

wherein history information related to a data migration executed in the past is also stored in the memory, and

wherein the microprocessor estimates a migration completion time required to complete either the execution plan or the re-execution plan based on the history information stored in the memory, and outputs the estimated migration completion time in association with either the execution plan or the re-execution plan.

15. The information processing system according to claim 13, wherein in a case where the execution plan failed, the microprocessor creates the re-execution plan by changing either the migration-source storage area or the migration-destination storage area, or both, to a different storage area in accordance with the reason for the failure.