SYSTEMS AND METHODS FOR VIRTUALIZING STORAGE SYSTEMS AND MANAGING DATA INDEPENDENTLY

• US 20110153965A1
• Filed: 10/21/2010
• Published: 06/23/2011
• Est. Priority Date: 12/17/2009
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: HAUSTEIN, Nils, KRAUSE, Thorsten
• Granted Patent: US 8,423,737 B2
• Time in Patent Office: Days
• US Class Current: 711/162
• CPC Class Codes: G06F 11/2056 by mirroring
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 3/0614 Improving the reliability of storage systems
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0629 Configuration or reconfiguration of storage systems
• CPC Class Codes: G06F 3/0638 Organizing or formatting or addressing of data
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/0683 Plurality of storage devices
• CPC Class Codes: G06F 3/0685 Hybrid storage combining heterogeneous device types, e.g. hierarchical storage, hybrid arrays

Abstract

Method, data processing systems, and computer program products are provided for virtualizing and managing a storage virtualization system (SVS) in a storage management architecture. Source data is copied from the source storage media to target data in a target storage media based on a predefined copy policy in a copy mapping table. A relation between the source data and the target data is tracked in a copy mapping table. It is determined if a copy of the requested data exists using the copy mapping table. A least utilized storage system having a copy of the requested storage media is determined. Access to the requested storage media in the least utilized storage system is tested. If access is not possible, access to a copy of the requested storage media in another storage system is provided by updating a frontend-backend mapping table and forwarding all data access commands to the other system.

Claims

1. A method for virtualizing and managing a storage virtualization system (SVS) in a storage management architecture, the SVS being connected to one or more storage systems, the one or more storage system comprising a plurality of storage media, the method comprising:

upon completion of write operations to a source storage media, copying source data from the source storage media to target data in a target storage media based on a predefined copy policy in a copy mapping table;

upon completion of the copying of the source data, tracking a relation between the source data and the target data in a copy mapping table;

upon reception of a read command for requested data to a requested storage media, determining if a copy of the requested data exists using the copy mapping table;

determining a least utilized storage system which holds a copy of the requested storage media;

responsive to the determination of the least utilized storage system, testing access to the requested storage media in the least utilized storage system; and

if access to the requested storage media in the least utilized storage system is not possible, providing access to a copy of the requested storage media in another storage system by updating a frontend-backend mapping table and forwarding all data access commands to the other storage system.

2. The method of claim 1, further comprising:

configuring tiered storage policies in a migration mapping table pertaining to the SVS;

mapping a source storage media to a target storage media and a migration policy; and

determining if a migration policy condition is true.

3. The method of claim 2, further comprising:

responsive to the migration policy condition, determining the source storage media and a migration storage media; and

determining if a copy relation between source storage media and migration storage media exists using the copy mapping table.

4. The method of claim 3, further comprising:

if the copy relation exists, removing the source storage media from the copy mapping table; and

if the copy relation does not exist, copying the source data of the source storage media to the migration storage media and removing the source data on the source storage media and updating the migration mapping table.

5. A data processing system for virtualizing and managing a storage virtualization system (SVS) in a storage management architecture, the SVS being connected to one or more storage systems, the one or more storage system comprising a plurality of storage media, the data processing system comprising:

at least one processor device, operable in the storage management architecture, wherein the at least one processor device is adapted for;

upon completion of write operations to a source storage media, copying source data from the source storage media to target data in a target storage media based on a predefined copy policy in a copy mapping table;

upon completion of the copying of the source data, tracking a relation between the source data and the target data in a copy mapping table;

upon reception of a read command for requested data to a requested storage media, determining if a copy of the requested data exists using the copy mapping table;

determining a least utilized storage system which holds a copy of the requested storage media;

responsive to the determination of the least utilized storage system, testing access to the requested storage media in the least utilized storage system; and

if access to the requested storage media in the least utilized storage system is not possible, providing access to a copy of the requested storage media in another storage system by updating a frontend-backend mapping table and forwarding all data access commands to the other storage system.

6. The data processing system of claim 5, wherein the at least one processor is further adapted for:

configuring tiered storage policies in a migration mapping table pertaining to the SVS;

mapping a source storage media to a target storage media and a migration policy; and

determining if a migration policy condition is true.

7. The data processing system of claim 6, wherein the at least one processor is further adapted for:

responsive to the migration policy condition, determining the source storage media and a migration storage media; and

determining if a copy relation between source storage media and migration storage media exists using the copy mapping table.

8. The data processing system of claim 7, wherein the at least one processor is further adapted for:

if the copy relation exists, removing the source storage media from the copy mapping table; and

if the copy relation does not exist, copying the source data of the source storage media to the migration storage media and removing the source data on the source storage media and updating the migration mapping table.

9. A computer program product virtualizing and managing a storage virtualization system (SVS) in a storage management architecture, the SVS being connected to one or more storage systems, the one or more storage system comprising a plurality of storage media, the computer program product comprising a computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

a first executable portion for, upon completion of write operations to a source storage media, copying source data from the source storage media to target data in a target storage media based on a predefined copy policy in a copy mapping table;

a second executable portion for, upon completion of the copying of the source data, tracking a relation between the source data and the target data in a copy mapping table;

a third executable portion for, upon reception of a read command for requested data to a requested storage media, determining if a copy of the requested data exists using the copy mapping table;

a fourth executable portion for determining a least utilized storage system which holds a copy of the requested storage media;

a fifth executable portion for, responsive to the determination of the least utilized storage system, testing access to the requested storage media in the least utilized storage system; and

a sixth executable portion for, if access to the requested storage media in the least utilized storage system is not possible, providing access to a copy of the requested storage media in another storage system by updating a frontend-backend mapping table and forwarding all data access commands to the other storage system.

10. The computer program product of claim 9, further comprising:

a seventh executable portion for configuring tiered storage policies in a migration mapping table pertaining to the SVS;

an eighth executable portion for mapping a source storage media to a target storage media and a migration policy; and

a ninth executable portion for determining if a migration policy condition is true.

11. The computer program product of claim 10, further comprising:

a tenth executable portion for, responsive to the migration policy condition, determining the source storage media and a migration storage media; and

an eleventh executable portion for determining if a copy relation between source storage media and migration storage media exists using the copy mapping table.

12. The computer program product of claim 11, further comprising:

a twelfth executable portion for, if the copy relation exists, removing the source storage media from the copy mapping table; and

a thirteenth executable portion for, if the copy relation does not exist, copying the source data of the source storage media to the migration storage media and removing the source data on the source storage media and updating the migration mapping table.

13. A data processing system for virtualizing and managing a storage virtualization system (SVS) in a storage management architecture comprising one or more host systems connected to the SVS, the SVS being connected to one or more storage systems, the one or more storage system comprising a plurality of storage media, the data processing system comprising:

a SVS located in the data path between the one or more host systems and the one or more storage systems;

means for managing a frontend-to-backend mapping table, the frontend-to-backend mapping table mapping backend resources to frontend resources;

means for managing a copy mapping table, the copy mapping table mapping a primary storage media to one or more secondary storage media and a copy policy where a storage media is identifiable by a serial number, a logical disk is identifiable by a logical unit number physically represented by one or more hard disks or solid state disks, or an optical disk is identifiable by a unique volume identifier; and

means for managing a migration mapping table, the migration mapping table mapping a source storage media to a migration storage media and a migration policy.