Rapid regeneration of failed disk sector in a distributed...

Details Rapid regeneration of failed disk sector in a distributed... Rapid regeneration of failed disk sector in a distributed...

2007-10-09

2007-10-09

Le, Dieu-Minh (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S006130

Reexamination Certificate

active

10776031

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. The disk controller for that disk will then perform its standard LBA remapping, and write the data to a new, good sector. 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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Kari, H., et al., “Analysis of Repair Algorithms for Mirrored-Disk Systems,”IEEE Transactions of Reliability, 46(2) pp. 193-200, Jun. 1997.

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