Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2008-01-29
2008-01-29
Lane, Jack (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S111000, C711S112000, C711S114000, C707S793000
Reexamination Certificate
active
11264837
ABSTRACT:
A mirroring application running on a primary server in a multiple destination mirroring environment is provided. The mirroring application configures a scanner with snapshots that are registered. The scanner calculates a logical age for each snapshot. The scanner scans a flexible volume once for data blocks that are newer than a predetermined snapshot. The scanner tags each such block with a logical age that is equivalent to the oldest snapshot that refers to that block. The scanner loads the tagged blocks in a queue. A sender module associated with each destination in the mirroring environment inspects blocks in the queue and retrieves only those blocks younger than a destination reference snapshot. The sender sends those blocks to the destination and filters out older blocks, thus bringing the destination mirror up to date with the current active file system.
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Cesari and McKenna LLP
Lane Jack
Network Appliance Inc.
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