Patent
1995-12-08
1998-05-26
Gossage, Glenn
39518205, 39549701, G06F 1200, G06F 1120
Patent
active
057581185
ABSTRACT:
An efficient method for adding one or more new direct access storage devices (DASDs) to a redundant array of independent disks (RAID) array without disrupting ongoing operation of the array. In one embodiment, after contents of new DASDs are initialized off-line, the "parity" or "data" status of specific storage locations in the array is re-mapped, without any changes to the storage locations' contents. In a second embodiment, RAID arrays are efficiently expanded and parallelism is facilitated for original as well as new data by re-mapping parity and data tracks, changing the contents of a minimum number of tracks and maintaining the contents of others.
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Choy David Mun-Hien
Menon Jaishankar Moothedath
Gossage Glenn
International Business Machines - Corporation
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