Method and apparatus for de-duplication after mirror operation

Electrical computers and digital processing systems: memory – Address formation – Hashing

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 6836819 (2004-12-01), Kano et al.
patent: 7065619 (2006-06-01), Zhu et al.
patent: 2002/0143903 (2002-10-01), Uratani et al.
patent: 2002/0169934 (2002-11-01), Krapp et al.
patent: 2005/0182888 (2005-08-01), Murotani et al.
“Single Instance Storage in Microsoft Windows Storage Server 2003 R2—A Solution for Managing Duplicate Files”, Technical White Paper, Microsoft Corp., May 2006, pp. 1-17.

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