System and method for sparing in RAID-1 system
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United States of America Patent
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Jun 13, 2006
Grant Date -
Nov 25, 2004
app pub date -
May 19, 2003
filing date -
May 19, 2003
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Abstract
A RAID-1 system achieves sparing by allocating 1/(2N-1) of each storage device as a spare region, in a mirrored RAID-1 system having N pair of mated devices. The remaining portion of each device is partitioned into (2N-2) data partitions. If a device fails, the contents of its mate are copied into the spare regions of the other devices. This preserves fault tolerance even if a second device subsequently fails.
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