Virtual storage systems and virtual storage system operational methods

• US 6,996,582 B2
• Filed: 10/03/2002
• Issued: 02/07/2006
• Est. Priority Date: 10/03/2002
• Status: Active Grant

• Current Assignee: Valtrus Innovations Limited (f/k/a Dolya Holdco 9 Limited) (Key Patent Innovations Limited)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Daniels, Rodger, Nelson, Lee L.
• Primary Examiner(s): Coby, Frantz
• Assistant Examiner(s): FILIPCZYK, MARCIN R
• Application Number:
  US10/264,525
• Publication Number:
  US 20040068522A1
• Time in Patent Office: 1,223 Days
• Field of Search: 707/1, 707/10, 707200-206, 711/203, 711/206, 711/6
• US Class Current: 711/203
• CPC Class Codes: G06F 12/10 Address translation
• CPC Class Codes: G06F 16/9024 Graphs; Linked lists G06F16/9027 takes precedence
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

Virtual storage systems and virtual storage system operational methods are described. According to one aspect, a virtual storage system includes a physical storage space configured to store data, a virtual storage space adapted to provide a representation of data stored within the physical storage space to a host, a memory configured to store a plurality of pointers utilized to implement addressing intermediate the physical storage space and the virtual storage space, and a controller configured to extract selected ones of the pointers from the memory and to provide the selected pointers in another storage location different than the memory at a first moment in time and to extract the selected pointers from the another storage location and to provide the selected pointers in the memory at a second moment in time subsequent to the first moment in time.

Claims

1. A virtual storage system comprising:

a physical storage space configured to store data;

a virtual storage space adapted to provide a representation of the data stored within the physical storage space to a host;

a memory configured to store a plurality of pointers utilized to implement addressing intermediate the physical storage space and the virtual storage space; and

a controller configured to extract selected ones of the pointers from the memory and to provide the selected pointers in a storage location different than the memory at a first moment in time and to extract the selected pointers from the storage location and to provide the selected pointers in the memory at a second moment in time subsequent to the first moment in time.

2. The system of claim 1 wherein the physical storage space comprises a plurality of physical storage volumes, and the controller is configured to provide the selected ones of the pointers in the storage location of at least one of the physical storage volumes.

3. The system of claim 1 wherein the controller is configured to write new pointers into the memory at locations of the extracted pointers after the extracting.

4. The system of claim 1 wherein the physical storage space comprises a plurality of hard disks, and the virtual storage space comprises a plurality of virtual storage volumes.

5. The system of claim 1 wherein the memory comprises random access memory.

6. The system of claim 1 wherein the controller is configured to identify the selected ones of the pointers before the extracting and using a criteria.

7. The system of claim 6 wherein the controller is configured to identify responsive to the criteria comprising not receiving an input/output request with respect to the selected ones of the pointers for a predetermined period of time.

8. The system of claim 6 wherein the controller is configured to identify responsive to the criteria comprising the selected ones of the pointers being associated with a snapshot volume of the virtual storage space.

9. The system of claim 6 wherein the controller is configured to identify responsive to the criteria comprising the selected ones of the pointers not being associated with a regular volume of the virtual storage space.

10. A virtual storage system comprising:

physical storage means configured to store data at a plurality of physical storage locations;

virtual storage means adapted to provide a representation of the physical storage means to a host using a plurality of virtual storage locations;

mapping means configured to associate a plurality of the virtual storage locations with a plurality of the physical storage locations; and

controller means configured to utilize the mapping means to access the physical storage locations, to deactivate a portion of the mapping means at an initial moment in time wherein the deactivated portion of the mapping means is not utilized to access the physical storage locations, and to activate the portion of the mapping means at a subsequent moment in time wherein the activated portion of mapping means is utilized to access the physical storage locations.

11. The system of claim 10 further comprising a memory means, and the mapping means is stored within the memory means comprising random access memory.

12. The system of claim 11 wherein the mapping means comprises pointer means, and the controller means is configured to extract the pointer means corresponding to the portion of the mapping means at the initial moment in time and to provide the extracted pointer means in other storage means to deactivate the portion of the mapping means.

13. The system of claim 12 wherein the physical storage means comprises a plurality of disk means, and the controller means is configured to provide the pointer means in the other storage means comprising the disk means.

14. The system of claim 12 wherein the controller means is configured to write new pointer means over the extracted pointer means after the initial moment in time.

15. The system of claim 10 wherein the controller means is configured to identify the portion of the mapping means before the deactivating using a criteria.

16. The system of claim 15 wherein the controller means is configured to identify responsive to the criteria comprising not receiving an input/output request with respect to the portion of the mapping means for a predetermined period of time.

17. The system of claim 15 wherein the controller means is configured to identify responsive to the criteria comprising the portion of the mapping means being associated with a snapshot volume of the virtual storage means.

18. The system of claim 15 wherein the controller means is configured to identify responsive to the criteria comprising the portion of the mapping means not being associated with a regular volume of the virtual storage means.

19. A virtual storage system operational method comprising:

providing a virtual storage space including a plurality of virtual storage locations;

providing a physical storage space including a plurality of physical storage locations configured to store data; and

providing a memory comprising a mapping system for associating respective ones of the virtual storage locations with respective ones of the physical storage locations;

extracting at least a portion of the mapping system from the memory at a first moment in time; and

providing the extracted portion of the mapping system into the memory at a second moment in time subsequent to the first moment in time.

20. The method of claim 19 wherein the providing the physical storage space comprises providing a plurality of physical storage volumes, and the providing the extracted portion comprises providing the extracted portion of the mapping system in at least one of the physical storage volumes.

21. The method of claim 19 wherein the providing the memory comprises providing the memory comprising the mapping system including a plurality of pointers, and the extracting comprises extracting some of the pointers.

22. The method of claim 21 further comprising writing new pointers into the memory at locations of the extracted pointers after the extracting.

23. The method of claim 19 wherein the providing the virtual storage space comprises providing a plurality of virtual storage volumes, and the providing the physical storage space comprises providing a plurality of hard disks.

24. The method of claim 23 wherein the virtual storage volumes comprise LUNs.

25. The method of claim 19 wherein the providing the memory comprises providing random access memory.

26. The method of claim 19 wherein the providing the virtual storage space comprises providing a plurality of virtual storage volumes, and further comprising identifying one of the virtual storage volumes, and wherein the extracting comprises extracting at least the portion of the mapping system corresponding to the identified one of the virtual storage volumes.

27. The method of claim 26 wherein the identifying comprises identifying responsive to a criteria.

28. The method of claim 27 wherein the identifying comprises identifying responsive to the criteria comprising the identified virtual storage volume not receiving an input/output request for a predetermined period of time.

29. The method of claim 27 wherein the identifying comprises identifying responsive to the criteria that the identified virtual storage volume comprises a snapshot volume.

30. The method of claim 27 wherein the identifying comprises identifying responsive to the criteria that the identified virtual storage volume not comprise a regular volume.