Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2008-07-01
2008-07-01
Thai, Tuan V. (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S100000, C711S154000
Reexamination Certificate
active
07395378
ABSTRACT:
Various methods and systems for updating a copy-on-write snapshot based on a dirty region log are disclosed. For example, a method involves maintaining a dirty region log and updating a copy-on-write snapshot change tracking map, based on information in the dirty region log. In some embodiments, the copy-on-write snapshot change tracking map is updated in response to an indication of a dirty region log cleaning cycle. The dirty region log cleaning cycle is inhibited until after the copy-on-write snapshot change tracking map has been updated. The method can be used to update multiple copy-on-write snapshot change tracking maps, each of which is associated with a respective one of several copy-on-write snapshots, based on information in the dirty region log. Such a method can be performed by a virtualizing network device.
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Pendharkar Niranjan S.
Roy Subhojit
Campbell Stephenson LLP
Symantec Operating Corporation
Thai Tuan V.
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