Log-structured temporal shadow store

Details Log-structured temporal shadow store Log-structured temporal shadow store

2007-08-14

2007-08-14

Lane, Jack A. (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C707S793000

Reexamination Certificate

active

10966968

ABSTRACT:
A log-structured temporal shadow store may comprise a logical storage aggregation including a plurality of blocks, a log-structured storage device, and shadow management software. The log-structured storage device may include a plurality of log entries, where each log entry includes one or more modified blocks of the logical storage aggregation and an index to the modified blocks. In response to a new batch of changes to the logical storage aggregation, the shadow management software may be configured to append a new log entry to the log-structured storage device, including newly modified blocks and an index to the newly modified blocks. The index may be organized as a modified B+ tree, and the log-structured storage device may be a logical volume, such as a mirrored logical volume.

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