Implementing dynamic copy-on-write (COW) storage compression...

Details Implementing dynamic copy-on-write (COW) storage compression... Implementing dynamic copy-on-write (COW) storage compression...

2007-01-03

2010-06-15

Kim, Hong (Department: 2185)

Data processing: database and file management or data structures

File or database maintenance

Database backup

C707S821000, C711S154000, C711S159000, C711S161000, C711S162000, C711S170000

Reexamination Certificate

active

07739241

ABSTRACT:
Methods, apparatus and computer program product implement enhanced dynamic copy-on-write storage compression. For a write operation, a purge function for a block being written is detected by the COW storage for compressing freed blocks from the COW storage. Responsive to the detected purge function and the block being a previously written block in the COW storage, the previously written block in the COW storage is deleted from the COW storage. Responsive to the detected purge function and the block not being a previously written block in the COW storage, the block is marked as zero in the COW storage.

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Ron Yorston, “Keeping filesystem images sparse”, http://intgat.tigress.co.uk/rmy/uml/sparsify.html, printed Dec. 8, 2006.
Sivathanu, et al., “Life or Death at Block-Level”, USENIX Association, OSDI '04: 6th Symposium on Operating Systems Design the Implementation, pp. 379-394.
http://lists.xensource.com/archives/html/xen-users/2006-01/msg00980.html, “Re: [Xen-users] Re: cow implementation—Xen Source”, printed Jul. 6, 2006.

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