Storage system with disk drive power-on-reset detection

Details Storage system with disk drive power-on-reset detection Storage system with disk drive power-on-reset detection

2007-03-06

2007-03-06

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S152000, C711S163000, C711S112000, C711S113000, C711S114000

Reexamination Certificate

active

10900998

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.

REFERENCES:
patent: 5375243 (1994-12-01), Parzych et al.
patent: 6775794 (2004-08-01), Horst et al.
Intel Technical Advisory TA-617-1, dated Jan. 1, 2003, titled “Intel RAID Controllers: RAID Levels 1, 4, 5 or 10 Dirve Removal and Immediate Re-insertion May Cause An Array Failure.”
8-page document titled “AMIBIOS8 Hard Disk Security,” version 1.1, dated Nov. 26, 2002, downloaded from www.ami.com.

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