Data processing: database and file management or data structures – Data integrity – Checking consistency
Reexamination Certificate
2009-06-29
2011-10-04
Ortiz, Belix M (Department: 2164)
Data processing: database and file management or data structures
Data integrity
Checking consistency
C707S695000, C707S697000, C707S758000, C707S703000
Reexamination Certificate
active
08032498
ABSTRACT:
A snapshot copy facility maintains information indicating block ownership and sharing between successive versions by delegating block reference counts to parent-child relationships between the file system blocks, as indicated by block pointers in inodes and indirect blocks. When a child block becomes shared between a parent block of the production file and a parent block of a snapshot copy, the delegated reference count is split among the parent blocks. This method is compatible with a conventional data de-duplication facility, and avoids a need to update block reference counts in block metadata of child blocks of a shared indirect block upon splitting the shared indirect block when writing to a production file.
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Armangau Philippe
Bono Jean-Pierre
Davenport William
Pawar Sitaram
Veeraswamy Sairam
Auchterlonie Richard
EMC Corporation
Novak Druce & Quigg LLP
Ortiz Belix M
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