Snapshot by deferred propagation

Details Snapshot by deferred propagation Snapshot by deferred propagation

2007-07-03

2007-07-03

Elmore, Stephen C. (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S154000, C711S161000, C711S162000, C711S165000, C707S793000, C707S793000, C707S793000, C707S793000, C707S793000, C707S793000

Reexamination Certificate

active

10360297

ABSTRACT:
An embodiment of the invention provides a method for creating a snapshot of a data store. A command to create a snapshot of an original data store, stored to a parent virtual logical unit (VLU), is received. A deferred propagation data structure (DPDS) is associated with the parent VLU. The DPDS is capable of containing data propagation records and separators, each data propagation record contains a previous version of one or more data blocks of the parent VLU, each separator contains a pointer to a particular child VLU storing a snapshot of the original data store and separating the data propagation records pertaining to the particular child VLU. A child VLU to store the copy of the original data store is created. A new separator containing a pointer to the child VLU is created in the DPDS. A search pointer pointing to the DPDS is implemented in the child VLU.

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