METHOD, COMPUTER PROGRAM PRODUCT, AND SYSTEM FOR PROVIDING A MULTI-TIERED SNAPSHOT OF VIRTUAL DISKS

• US 20080162843A1
• Filed: 01/03/2007
• Published: 07/03/2008
• Est. Priority Date: 01/03/2007
• Status: Active Grant

• Current Assignee: X Corp. (f/k/a Twitter, Inc.) (X Holdings Corp.)
• Original Assignee: International Business Machines Corporation
• Inventors: Davis, Kristan D., Lucke, Kyle A., Haze, Thomas L., Koch, Andrew T., Thompson, Martin J.
• Granted Patent: US 7,734,954 B2
• Time in Patent Office: Days
• US Class Current: 711/162
• CPC Class Codes: G06F 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/0662 Virtualisation aspects
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

An object in a tier of a multi-tier virtual storage system is saved while the storage system is active. The object to be saved in an upper-level tier in the multi-tier storage system is identified. Servers associated with lower-level tiers below the tier containing the object to be saved to obtain the latest data stored in the respective associatd tiers, use temporary storage to store the obtained data and handle any modifications to the obtained data, and cause applications running in the respective tiers to quiesee. Once a copy of the identified object is made, the servers associated with the lower-level tiers are instructed to obtain the data from the temporary storage and resume quiesced applications running in the respective tiers.

Claims

1. A method for saving an object in a tier of a multi-tier virtual storage system while the storage is active, comprising:

identifying an object to be saved in an upper-level tier in the multi-tier storage system;

instructing servers associated with lower-level tiers below the tier containing the object to be saved to obtain the latest data stored in the respective associated tiers, use temporary storage to store the obtained data and handle any modifications to the obtained data, and cause applications running in the respective tiers to quiesce;

making a copy of the identified object; and

instructing the servers associated with the lower-level tiers to obtain the data from the temporary storage and resume quiesced applications running in the respective tiers.

2. The method of claim 1, wherein the step of instructing servers associated with the lower-level tiers to cause the applications in the respective tiers to quiesce includes temporarily halting operation of the applications.

3. The method of claim 1, wherein the step of instructing the servers associated with the lower-level tiers to obtain data from the temporary storage includes instructing the servers associated with the lower-level tiers to synchronize write requests that were stored into temporary storage on the virtual disk being saved.

4. The method of claim 1, wherein tiers above the tier containing the object to be saved continue to read and write data to storage without interruption.

5. The method of claim 1, wherein the multi-tier virtual storage system is shared by multiple operating systems.

6. The method of claim 5, wherein the multiple operating systems include a hosting operating system and one or more hosted operation systems.

7. The method of claim 6, wherein the operating system communicate via an Ethernet layer.

8. A computer program produce for saving an object in a tier of a multi-tier virtual storage system while the storage systems is active, the computer program product comprising a computer usable medium having a computer readable program, wherein the computer readable program, when executed on a computer, causes the computer to:

identify an object to be saved in an upper-level tier in the multi-tier storage system;

instruct servers associated with lower-level tiers below the tier containing the object to be saved to obtain the latest data stored in the respective associated tiers, use temporary storage to store the obtained data and handle any modifications to the obtained data, and cause applications running in the respective tiers to quiesce;

make a copy of the identified object; and

instruct the servers associated with the lower-level tiers to obtain the data from the temporary storage and resume quiesced applications running in the respective tiers.

9. The computer program product of claim 8, wherein causing the applications in respective lower-level tiers to quiesce includes temporarily halting operation of the applications.

10. The computer program product of claim 8, wherein as part of causing the computer to instruct the servers associated with the lower-level tiers to obtain data from the temporary storage, the computer readable program causes the computer to instruct the servers associated with the lower-level tiers to synchronize their write requests that were stored into temporary storage on the virtual disk being saved.

11. The computer program product of claim 8, wherein tiers above the tier containing the object to be saved continue to read and write data to storage without interruption.

12. The computer program product of claim 8, wherein the multi-tier virtual storage system is shared by multiple operating systems.

13. The computer program product of claim 12, wherein the multiple operating systems include a hosting operating system and one or more hosted operating systems.

14. The computer program product of claim 13, wherein the operating systems communicate via an Ethernet.

15. A multi-tier virtual storage system, comprising:

multiple tiers containing data associated with multiple respective servers; and

a virtual storage space and Ethernet layer enabling communication between the tiers, wherein an object to be saved in an upper-level tier in the multi-tier storage system is identified, servers associated with lower-level tiers below the tier containing the object to be saved obtain the latest data stored in the respective associated tiers, use temporary storage to store the obtained data and handle any modifications to the obtained data, and cause applications running in the respective tiers to quiesce; and

a file for making a copy of the identified object, wherein once the identified object is copies, the servers associated with the lower-level tiers obtain the data from the temporary storage and resume quiesced applications running in the respective tiers.

16. The system of claim 15, wherein the application in the lower-level tiers quiesce by temporarily halting operating.

17. The system of claim 15, wherein the servers associated with the lower-level tiers synchronize their write request that were stored into temporary storage on the virtual disk being saved when obtaining data from the temporary storage.

18. The system of claim 15, wherein tiers above the tier containing the object to be saved continue to read and write data to storage without interruption.

19. The system of claim 15, wherein the multi-tier virtual storage system is shared by multiple operating systems.

20. The system of claim 19, wherein the multiple operating systems include a hosting operating system and one or more hosted operating systems.