System and method for reducing unrecoverable media errors in a disk subsystem
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United States of America Patent
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Sep 25, 2007
Grant Date -
N/A
app pub date -
Apr 24, 2003
filing date -
Apr 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for reducing unrecoverable errors in a disk drive by under-taking an aggressive reassignment of slow-reading or currently recoverable-but-erroneous sectors to the spares pool is provided. A recovered error is treated by the system operating system as a fatal error and thereby the sectors involved are reassigned to the spares pool immediately. Reassignment is recommended by a reassignment utility at the disk interface level, which passes a status up to the RAID subsystem by which reassignment is performed. In order to prevent a double-disk panic, the RAID subsystem is instructed to ignore reassignment recommendations of this type (e.g. reassignment of recoverable errors) if the RAID group is currently operating in a degraded state. However, if the RAID group is undegraded, then immediate assignment of the sectors encountering the recoverable error is undertaken.
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