Mountable container for incremental file backups

• US 9,946,603 B1
• Filed: 04/14/2015
• Issued: 04/17/2018
• Est. Priority Date: 04/14/2015
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Kumar, Kiran MV, Mandic, Vladimir, Jagannatha, Manjunath, Panem, Ravi Shankar
• Primary Examiner(s): Cao, Phuong Thao
• Application Number:
  US14/686,668
• Time in Patent Office: 1,099 Days
• Field of Search: 707646
• CPC Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 11/3034 where the computing system component is a storage system, e.g. DASD based or network based digital input from or digital output to record carriers G06F3/06; digital recording or reproducing G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/3079 the data filtering being achieved by reporting only the changes of the monitored data
• CPC Class Codes: G06F 16/148 File search processing
• CPC Class Codes: G06F 16/162 Delete operations erasing in storage systems G06F3/0652

Abstract

Information identifying a set of changed blocks on a volume of a client are received. The changed blocks are blocks of the volume that have changed since a previous backup of the client. The set of changed blocks are filtered to identify a subset of changed blocks that are associated with a particular file. The subset of changed blocks is streamed to a backup storage server for storage as an incremental virtual hard disk file. The incremental virtual hard disk file is associated to a full backup virtual hard disk file, where the full backup virtual hard disk file is a full backup of a previous version of the particular file.

Claims

1. A method for making an incremental backup of changes to a particular file comprising:

receiving from a change block tracking (CBT) module information identifying a plurality of changed blocks on a volume of a client, the changed blocks being blocks of the volume that have changed since a previous backup of the client;

filtering the plurality of changed blocks to identify a subset of changed blocks that are associated with the particular file;

streaming the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file;

associating the incremental virtual hard disk file to a full backup virtual hard disk file, the full backup virtual hard disk file being a full backup of a previous version of the particular file;

before the receiving from a change block tracking module information identifying a plurality of changed blocks, creating a container having a size that accommodates a size of the previous version of the particular file;

creating a temporary file having a size that corresponds to the size of the previous version of the particular file, the size of the temporary file being less than the size of the container;

backing up, using the container and the temporary file, the previous version of the particular file to create the full backup virtual hard disk file; and

after the backing up, deleting the container and the temporary file, wherein the streaming the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file comprises not creating another container.

2. The method of claim 1 comprising not streaming blocks of the plurality of changed blocks that are outside the subset of changed blocks.

3. The method of claim 1 wherein the filtering the plurality of changed blocks comprises:

identifying a set of extents on the client occupied by the particular file;

comparing the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block maps to an extent of the set of extents, determining that the changed block is associated with the particular file.

4. The method of claim 1 wherein the filtering the plurality of changed blocks comprises:

identifying a set of extents on the client occupied by the particular file;

comparing the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block does not map to any extent of the set of extents, determining that the changed block is not associated with the particular file.

5. The method of claim 1 wherein the file comprises a database file.

6. The method of claim 1 wherein the incremental virtual hard disk file comprises a block from the particular file that has changed with respect to the previous version of the particular file, a newly occupied block from the particular file, the newly occupied block not being in the previous version of the particular file, or both.

7. The method of claim 1 wherein the volume comprises a first directory structure within which the previous version of the particular file resides, and the method comprises:

creating, within the container, a second directory structure, wherein the second directory structure matches the first directory structure.

8. The method of claim 7 wherein the temporary file is created in the second directory structure.

9. The method of claim 1 wherein the temporary file is empty during the backing up.

10. The method of claim 1 wherein the backing up, using the container and the temporary file, comprises:

reading the volume to backup content of the previous version of the particular file; and

reading the container to backup metadata associated with the content, wherein the metadata in the container specifies a directory path that matches a directory path of the volume within which the previous version of the particular file resides.

11. A system for incrementally backing up a particular file, the system comprising:

a processor-based system executed on a computer system and comprising a processor, wherein the processor is configured to;

receive from a change block tracking (CBT) module information identifying a plurality of changed blocks on a volume of a client, the changed blocks being blocks of the volume that have changed since a previous backup of the client;

filter the plurality of changed blocks to identify a subset of changed blocks that are associated with the particular file;

stream the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file;

associate the incremental virtual hard disk file to a full backup virtual hard disk file, the full backup virtual hard disk file being a full backup of a previous version of the particular file;

before the receipt from a change block tracking module information identifying a plurality of changed blocks, create a container having a size that accommodates a size of the previous version of the particular file;

create a temporary file having a size that corresponds to the size of the previous version of the particular file, the size of the temporary file being less than the size of the container;

backup, using the container and the temporary file, the previous version of the particular file to create the full backup virtual hard disk file; and

after the backup, delete the container and the temporary file, wherein the stream of the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file does not comprise creation of another container.

12. The system of claim 11 wherein the processor-based system is configured to:

not stream blocks of the plurality of changed blocks that are outside the subset of changed blocks.

13. The system of claim 11 wherein the processor-based system is configured to:

identify a set of extents on the client occupied by the particular file;

compare the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block maps to an extent of the set of extents, determine that the changed block is associated with the particular file.

14. The system of claim 11 wherein the processor-based system is configured to:

identify a set of extents on the client occupied by the particular file;

compare the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block does not map to any extent of the set of extents, determine that the changed block is not associated with the particular file.

15. A computer program product, comprising a non-transitory computer-readable medium having a computer-readable program code embodied therein, the computer-readable program code adapted to be executed by one or more processors to implement a method comprising:

receiving from a change block tracking (CBT) module information identifying a plurality of changed blocks on a volume of a client, the changed blocks being blocks of the volume that have changed since a previous backup of the client;

filtering the plurality of changed blocks to identify a subset of changed blocks that are associated with a particular file;

streaming the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file;

associating the incremental virtual hard disk file to a full backup virtual hard disk file, the full backup virtual hard disk file being a full backup of a previous version of the particular file;

before the receiving from a change block tracking module information identifying a plurality of changed blocks, creating a container having a size that accommodates a size of the previous version of the particular file;

creating a temporary file having a size that corresponds to the size of the previous version of the particular file, the size of the temporary file being less than the size of the container;

backing up, using the container and the temporary file, the previous version of the particular file to create the full backup virtual hard disk file; and

after the backing up, deleting the container and the temporary file, wherein the streaming the subset of changed blocks to a backup storage server for storage as an incremental virtual hard disk file comprises not creating another container.

16. The computer program product of claim 15 wherein the method comprises not streaming blocks of the plurality of changed blocks that are outside the subset of changed blocks.

17. The computer program product of claim 15 wherein the filtering the plurality of changed blocks comprises:

identifying a set of extents on the client occupied by the particular file;

comparing the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block maps to an extent of the set of extents, determining that the changed block is associated with the particular file.

18. The computer program product of claim 15 wherein the filtering the plurality of changed blocks comprises:

identifying a set of extents on the client occupied by the particular file;

comparing the identified set of extents to the information identifying the plurality of changed blocks; and

based on the comparison, if a changed block does not map to any extent of the set of extents, determining that the changed block is not associated with the particular file.