Storage system with disk drive power-on-reset detection
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United States of America Patent
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Sep 15, 2009
Grant Date -
May 24, 2007
app pub date -
Jan 22, 2007
filing date -
Dec 5, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A disk array controller reliably detects disk drive power-on-reset events that may cause a disk drive that has uncommitted write data stored in its cache to lose such data. The methods for detecting the power-on-reset events include operating the disk drives in an ATA security mode in which a power-on-reset of a disk drive will cause the drive to enter a locked state in which data transfer commands are aborted; and tracking power cycle count attributes of the disk drives over time. When a disk drive power-on-reset event is detected, the disk array may be efficiently restored to an operational state by re-executing or “replaying” a set of write commands that are cached within the disk array controller. The invention is also applicable to single-disk-drive storage systems.
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