Rapid regeneration of failed disk sector in a distributed database system
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United States of America Patent
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Nov 23, 2010
Grant Date -
Dec 27, 2007
app pub date -
Aug 30, 2007
filing date -
Feb 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique for read error failover processing in a mirrored disk system such as a Redundant Array of Inexpensive Disks (RAID) system, where individual disk units perform Logical Block Address (LBA) remapping. A read error causes a disk controller to report an “unrecoverable” read error to a RAID controller. After receiving this report of an unrecoverable read error, rather than simply switching over to a mirror, the RAID controller first checks to see whether the disk that caused the error can successfully reassign an LBA. In particular, the RAID controller can retrieve the data that was associated with the failed LBA from the mirror, and then write that data to the offending disk. Only if this process does not succeed is the offending disk then treated by the RAID controller as having failed sufficiently to require failover to the mirror.
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