Managing a snapshot stored within a file system space for...

Details Managing a snapshot stored within a file system space for... Managing a snapshot stored within a file system space for...

2011-04-05

2011-04-05

Robinson, Greta L (Department: 2169)

Data processing: database and file management or data structures

File or database maintenance

Database backup

C707S696000, C707S823000, C711S162000

Reexamination Certificate

active

07921081

ABSTRACT:
In one embodiment, at least one snapshot thread manages a point in time snapshot of a file system stored within the space allocated to the file system. The snapshot thread tracks, for at least one block of the plurality of blocks of the file system, a separate entry in a snapshot map specifying if each at least one block is newly allocated following the creation of the point in time snapshot and specifying an addressed location of a snapshot copy of the at least one block if copied. Separately, a file system handling thread tracks a mapping of an allocation state of each of said plurality of blocks of the file system. Responsive to detecting the file system triggered to write or delete a particular block from among the at least one block of the file system, the snapshot thread allows the file system to write to or delete the particular block without making a snapshot copy of the particular block if a particular entry for the particular block in the snapshot map specifies the particular block is newly allocated, wherein a block marked newly allocated was not in-use at the point in time of the file system snapshot.

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“Overview of ZFS Snapshots”, Sun Microsystems4 pages, [online], [print accessed on Apr. 25, 2007]. Retrieved from <http://docs.sun.com/app/docs/doc/817-2271/6mhupg6ga?a=view#gbcxc>.
“Fast Initialization of File System Snapshot”, International Business Machines Corporation, Nov. 20, 2003, 3 pages, [online], ip.com prior art database, IPCOM000020430D.

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