Proxy Backup of Virtual Disk Image Files on NAS Devices

• US 20110047340A1
• Filed: 08/21/2009
• Published: 02/24/2011
• Est. Priority Date: 08/21/2009
• Status: Active Grant

• Current Assignee: Veritas Technologies, LLC (Whitehouse Group Ltd.)
• Original Assignee: Symantec Corporation (NortonLifeLock Inc.)
• Inventors: Naftel, Timothy M., Olson, James Robert, Nguyen, Sinh D., Ohr, James P., Teater, David
• Granted Patent: US 8,438,349 B2
• Time in Patent Office: Days
• US Class Current: 711/162
• CPC Class Codes: G06F 11/1456 Hardware arrangements for backup
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 11/1466 to make the backup process non-disruptive
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 2201/815 Virtual
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data

Abstract

A system and method for backing up a virtual machine executing on a virtualization server computer are described. A snapshot of a virtual disk image file of the virtual machine may be created on a network-attached storage (NAS) device coupled to the virtualization server computer. The snapshot may be used to backup the virtual disk image file from the NAS device to a backup storage device without transferring the virtual disk image file through the virtualization server computer. Mapping information useable to access the plurality of files stored in the virtual disk image file on an individual basis may be created and stored together with the backup copy of the virtual disk image file on the backup storage device.

Claims

1. A computer-accessible storage medium storing program instructions executable to:

perform a backup of a virtual machine executing on a virtualization server computer by;

requesting a snapshot of a virtual disk image file of the virtual machine to be created on a network-attached storage (NAS) device coupled to the virtualization server computer, wherein the virtual disk image file stores a plurality of files used by the virtual machine;

receiving access information useable to access the snapshot on the NAS device; and

using the snapshot to backup the virtual disk image file from the NAS device to a backup storage device without transferring the virtual disk image file through the virtualization server computer.

2. The computer-accessible storage medium of claim 1, wherein the program instructions are further executable to:

create mapping information useable to access the plurality of files stored in the virtual disk image file on an individual basis, wherein for each respective file of the plurality of files, the mapping information specifies a location of the respective file within the virtual disk image file; and

store the mapping information on the backup storage device.

3. The computer-accessible storage medium of claim 2, wherein the program instructions are further executable to:

receive a request to restore a particular file of the plurality of files from the virtual disk image file on the backup storage device to a particular computer system;

in response to the request to restore the particular file, access the mapping information to determine location information specifying the location of the particular file within the virtual disk image file on the backup storage device;

extract the particular file from the virtual disk image file on the backup storage device using the location information; and

transfer the particular file to the particular computer system.

4. The computer-accessible storage medium of claim 1,

wherein the virtual disk image file is one of:

a Virtual Machine Disk Format (VMDK) file;

a Virtual Hard Disk (VHD) file.

5. The computer-accessible storage medium of claim 1,

wherein the program instructions are executable by a particular computer;

wherein the program instructions are executable to;

communicate with the NAS device to transfer data of the snapshot to the particular computer; and

communicate with the backup storage device to transfer the data of the snapshot to the backup storage device.

6. The computer-accessible storage medium of claim 1,

wherein the program instructions are executable by a particular computer;

wherein the program instructions are executable to;

communicate with the NAS device to cause the NAS device to transfer data of the snapshot to the backup storage device without transferring the data through the particular computer.

7. A system comprising:

one or more processors; and

memory storing program instructions;

wherein the program instructions are executable by the one or more processors to perform a backup of a virtual machine executing on a virtualization server computer by;

requesting a snapshot of a virtual disk image file of the virtual machine to be created on a network-attached storage (NAS) device coupled to the virtualization server computer, wherein the virtual disk image file stores a plurality of files used by the virtual machine;

receiving access information useable to access the snapshot on the NAS device; and

using the snapshot to backup the virtual disk image file from the NAS device to a backup storage device without transferring the virtual disk image file through the virtualization server computer.

8. The system of claim 7, wherein the program instructions are further executable by the one or more processors to:

create mapping information useable to access the plurality of files stored in the virtual disk image file on an individual basis, wherein for each respective file of the plurality of files, the mapping information specifies a location of the respective file within the virtual disk image file; and

store the mapping information on the backup storage device.

9. The system of claim 8, wherein the program instructions are further executable by the one or more processors to:

receive a request to restore a particular file of the plurality of files from the virtual disk image file on the backup storage device to a particular computer system;

in response to the request to restore the particular file, access the mapping information to determine location information specifying the location of the particular file within the virtual disk image file on the backup storage device;

extract the particular file from the virtual disk image file on the backup storage device using the location information; and

transfer the particular file to the particular computer system.

10. The system of claim 7,

wherein the virtual disk image file is one of:

a Virtual Machine Disk Format (VMDK) file;

a Virtual Hard Disk (VHD) file.

11. The system of claim 7,

wherein the one or more processors are included in a particular computer;

wherein the program instructions are executable by the one or more processors to;

communicate with the NAS device to transfer data of the snapshot to the particular computer; and

communicate with the backup storage device to transfer the data of the snapshot to the backup storage device.

12. The system of claim 7,

wherein the one or more processors are included in a particular computer;

wherein the program instructions are executable by the one or more processors to;

communicate with the NAS device to cause the NAS device to transfer data of the snapshot to the backup storage device without transferring the data through the particular computer.

13. A computer-accessible storage medium storing program instructions executable to:

perform a backup of a virtual machine executing on a virtualization server computer by;

requesting a first snapshot of a virtual disk image file of the virtual machine to be created within a file system volume stored on a network-attached storage (NAS) device coupled to the virtualization server computer;

requesting a second snapshot of the file system volume to be created on the NAS device;

receiving access information useable to access the second snapshot on the NAS device in response to requesting the second snapshot to be created; and

using the second snapshot to backup the virtual disk image file from the NAS device to a backup storage device without transferring the data through the virtualization server computer.

14. The computer-accessible storage medium of claim 13, wherein the program instructions are further executable to:

create mapping information useable to access the plurality of files stored in the virtual disk image file on an individual basis, wherein for each respective file of the plurality of files, the mapping information specifies a location of the respective file within the virtual disk image file; and

store the mapping information on the backup storage device.

15. The computer-accessible storage medium of claim 14, wherein the program instructions are further executable to:

receive a request to restore a particular file of the plurality of files from the virtual disk image file on the backup storage device to a particular computer system;

in response to the request to restore the particular file, access the mapping information to determine location information specifying the location of the particular file within the virtual disk image file on the backup storage device;

extract the particular file from the virtual disk image file on the backup storage device using the location information; and

transfer the particular file to the particular computer system.

16. The computer-accessible storage medium of claim 13,

wherein the virtual disk image file is one of:

a Virtual Machine Disk Format (VMDK) file;

a Virtual Hard Disk (VHD) file.