Electrical computers and digital processing systems: memory – Address formation – Hashing
Reexamination Certificate
2011-01-18
2011-01-18
Gu, Shawn X (Department: 2189)
Electrical computers and digital processing systems: memory
Address formation
Hashing
C711S114000, C711S162000, C711S165000, C711S170000, C711SE12002
Reexamination Certificate
active
07873809
ABSTRACT:
An amount of storage capacity used during mirroring operations is reduced by applying de-duplication operations to the mirror volumes. Data stored to a first volume is mirrored to a second volume. The second volume is a virtual volume having a plurality of logical addresses, such that segments of physical storage capacity are allocated for a specified logical address as needed when data is stored to the specified logical address. A de-duplication operation is carried out on the second volume following a split from the first volume. A particular segment of the second volume is identified as having data that is the same as another segment in the second volume or in the same consistency group. A link is created from the particular segment to the other segment and the particular segment is released from the second volume so that physical storage capacity required for the second volume is reduced.
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Gu Shawn X
Hitachi , Ltd.
Mattingly & Malur, P.C.
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