Method and system for online data migration on storage systems with performance guarantees

• US 20020174419A1
• Filed: 04/30/2001
• Published: 11/21/2002
• Est. Priority Date: 04/30/2001
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Wilkes, John, Lu, Chenyang, Alvarez, Guillermo A.
• Granted Patent: US 7,167,965 B2
• Time in Patent Office: Days
• US Class Current: 717/168
• CPC Class Codes: G06F 11/3433 for load management allocation of a server based on load conditions G06F9/505; load rebalancing G06F9/5083; redistributing the load in a network by a load balancer H04L67/1029
• CPC Class Codes: G06F 11/3466 Performance evaluation by tracing or monitoring
• CPC Class Codes: G06F 11/3485 for I/O devices
• CPC Class Codes: G06F 16/214 Database migration support

Abstract

A method and system for a migration executor of an on-line data migration engine is utilized to provide data migration of a user'"'"'s data in a data storage system while maintaining application performance guarantees. In particular, the migration executor includes a monitor module configured to monitor performance metrics of a computer system executing foreground applications and the on-line data migration, where quality-of-service parameters computed from the performance metrics are forwarded to a controller module. The controller module of the migration executor is configured to compare the quality-of-service parameters of the computer system with performance goals for the foreground applications. The controller module may be further configured to issue commands to an actuator module that is configured to increase or decrease the rate of the data migration, where the actuator module is further configured to perform the data migration by executing a migration plan. The migration executor further includes a logical-volume (“LV”) mover, which is configured to move blocks of data within the data storage system of the computer system in response to a command from the actuator.

Claims

1. A method for migrating data, said method comprising:

moving a set of data in a data storage system of a computer system;

monitoring a performance of at least one executing application, while said moving is in progress; and

modifying a rate of said moving in response to said monitoring.

2. The method for migrating data according to claim 1, further comprising:

setting a performance goal for said at least one executing application, wherein said rate of said moving is increased in response to said monitoring of said performance exceeding said performance goal.

3. The method for migrating data according to claim 1, further comprising:

setting a performance goal for said at least one application, wherein said rate of said moving is decreased in response to said monitoring of said performance not achieving said performance goal.

4. The method for migrating data according to claim 1, further comprising:

inputting an initial placement of said set of data;

inputting a target placement of said set of data;

developing a migration plan, said migration plan configured to plan said moving of said set of data from said initial placement to said target placement; and

executing said migration plan to implement said moving of said set of data.

5. The method for migrating data according to claim 4, further comprising:

setting a performance goal for said at least one executing application; and

wherein said monitoring of said performance is conducted at a periodic sampling interval.

6. The method for migrating data according to claim 5, further comprising:

modifying said rate after said periodic sampling interval in response to said performance of said at least one executing application.

7. The method for migrating data according to claim 6, further comprising:

increasing said rate in response to said performance of said at least one executing application exceeding said performance goal.

8. The method for migrating data according to claim 6, further comprising:

decreasing said rate in response to said performance of said at least one executing application not achieving said performance goal.

9. The method for migrating data according to claim 5, further comprising:

setting a violation goal, wherein said violation goal is a maximum percentage of performance violations of all accesses; and

restricting, based on the results of said monitoring, said performance violations not to exceed said violation goal.

10. The method for migrating data according to claim 1, wherein:

said set of data is moved in increments of portions contained within a logical volume.

11. A system for migrating data on a computer system, said system comprising:

a monitor configured to monitor a performance of at least one application executing on said computer system;

a controller configured to compare said performance with a performance goal of said at least one application; and

an actuator configured to adjust a rate of movement of a set of data from one location in said computer system to another location in said computer system, wherein said controller is further configured to adjust said rate of movement in response to said comparison of said performance and said performance goal.

12. The system for migrating data on a computer system according to claim 11, further comprising:

a logical volume mover configured to move data in increments of portions contained within a logical volume, wherein said actuator is further configured to issue commands to a manager of said logical volume to adjust said rate of movement of said set of data.

13. The system for migrating data on a computer system according to claim 12, further comprising:

a planner configured to generate a migration plan in response to an input of an initial placement map of said set of data and a target placement map of said set of data, wherein said migration plan is configured to provide a partially ordered set of moves for said set of data and to be executed by said actuator.

14. The system for migrating data on a computer system according to claim 12, wherein:

said actuator is further configured to issue a command to increase said rate of movement of said set of data in response to said controller determining said performance exceeds said performance goal.

15. The system for migrating data on a computer system according to claim 12, wherein:

said actuator is further configured to issue a command to reduce said rate of movement of said set of data in response to said controller determining performance does not achieve said performance goal.

17. The computer readable storage medium in according to claim 16, said one or more computer programs further comprising a set of instructions for:

inputting an initial placement of said set of data;

inputting a target placement of said set of data;

developing a migration plan, said migration plan configured to plan said moving of said set of data from said initial placement to said target placement; and

executing said migration plan to implement said moving of said set of data.

18. The computer readable storage medium in according to claim 17, said one or more computer programs further comprising a set of instructions for:

setting a performance goal for said at least one executing application, wherein said monitoring of said performance is conducted at a periodic sampling interval.

19. The computer readable storage medium in according to claim 18, said one or more computer programs further comprising a set of instructions for:

setting a violation goal, wherein said violation goal is a maximum percentage of performance violations of all accesses; and

restricting, based on the results of said monitoring, said performance violations not to exceed said violation goal.

20. The computer readable storage medium in according to claim 18, said one or more computer programs further comprising a set of instructions for:

modifying said rate after said periodic sampling interval in response to said performance of said at least one application.

16. A computer readable storage medium on which is embedded one or more computer programs, said one or more computer programs implementing a method for migrating data on a computer system, said one or more computer programs comprising a set of instructions for:

moving a set of data in a data storage system of a computer system;

monitoring a performance of at least one application executing on a computer system; and

modifying a rate of said moving in response to said monitoring.