Patent
1997-03-10
1998-08-25
Nguyen, Viet Q.
395180, 39518206, 39518203, 395427, G06F 1100
Patent
active
057991405
ABSTRACT:
A method and system are provided for improving the speed for writing data in a disk array system (RAID). Disks are divided into the ones for reading old data and the other ones for writing new data. An external semiconductor storage device is used as a parity device which significantly enhances performance in writing.
A disk array system is used for storing data for which a parity group comprises N data units stored in sectors of N magnetic disk drives with parity stored in the parity device. At least N+1 data-storing magnetic disk drives are provided, where sectors of at least one magnetic disk drive are used as redundant sectors.
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Matsuo Nobuyuki
Niijima Hideto
Shimada Mayumi
International Business Machines - Corporation
Klein Esther E.
Nguyen Viet Q.
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