Excavating
Patent
1993-06-29
1995-02-14
Atkinson, Charles E.
Excavating
371 101, 371 401, G06F 1110, G06F 1120
Patent
active
053903277
ABSTRACT:
In a storage system having a plurality of disks arranged in a RAID-4 or RAID-5 array, a method of improving the performance and reliability of the array in the absence of a member. The method re-organizes the array into the equivalent of a higher performance and reliability RAID-0 organization while allowing concurrent high performance application access to the array and includes a deliberate reorganization activity concurrent with application access. The method also restores the RAID-4 or RAID-5 organization subsequent to the failure of a member using a replacement member while continuing to allow concurrent high performance application access to the array. In order to perform this reorganization on-line state information is maintained for each parity block, each data block and the array itself. A recently removed disk may be reinserted using an expedited replacement process.
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Lubbers Clark E.
Thiel David W.
Atkinson Charles E.
Cefalo Albert P.
Digital Equipment Corporation
Hudgens Ronald C.
Steubing Mary M.
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