Method for operating disk drives in a data storage system

Details Method for operating disk drives in a data storage system Method for operating disk drives in a data storage system

2005-06-16

2008-11-18

Elmore, Reba I (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S163000, C711S166000

Reexamination Certificate

active

07454561

ABSTRACT:
A system sets a disk access inhibitor flag whenever a disk drive is placed by the system in an inaccessible condition. The drive operates to set a bit therein when the drive has placed itself in a by-pass condition. During each polling event, the system determines: (1) whether the bit has been set; and (2) whether the disk access inhibitor flag has been set. If the bit has been set and such disk access inhibitor flag has been set, the system maintains the drive in the inaccessible condition; otherwise, the drive is accessible to the system. If, during a polling event, the bit has been set but that drive has not had a bit set during a relatively long period of time, the system maintains the drive accessible to the system unless the drive sets the bit during a subsequent predetermined wait period, after which the system sets the flagdisk access inhibitor flag and places the drive in the inaccessible condition.

REFERENCES:
patent: 6256748 (2001-07-01), Pinson
patent: 2001/0021217 (2001-09-01), Gunther et al.

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