Patent
1995-02-07
1997-07-01
Ellis, Richard L.
39518312, 39518502, G06F 1122
Patent
active
056447671
ABSTRACT:
A method whereby a host computer system is informed of the drive status in a disk array when one or more of the disk drives fail. A data pattern (timestamp or status code) is written on each of the disk drives in service in the array when an event occurs which changes the operating state of an array. The state of an array changes only when the array is configured, unconfigured, a disk drive fails, parity is marked inconsistent or the array is restored. The timestamp includes a binary number to allow the system to determine the status of each disk drive in the array. At each state, the timestamp on each of the operating disk drives is updated to reflect the number of operating disk drives and the status of the parity data. The distinct binary numbers that result when the array changes states allow the system to maintain the data integrity of the array.
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AT&T Global Information Solutions Company
Bailey Wayne P.
Ellis Richard L.
Fishman Daniel N.
Hyundai Electronics America
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