Disk array system and method for storing data

Details Disk array system and method for storing data Disk array system and method for storing data

1995-04-21

1997-07-22

Nguyen, Viet Q.

Static information storage and retrieval

Read/write circuit

Bad bit

395441, 395439, G06F 1100

Patent

active

056509693

ABSTRACT:
A method and system are provided for improving the speed for writing data in a disk array system (RAID). Sectors of the 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. Preferably, 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 magnetic disk drives are provided, where sectors of at least one magnetic disk drive are used as redundant sectors.

REFERENCES:
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patent: 5412661 (1995-05-01), Hao et al.
patent: 5416915 (1995-05-01), Mattson et al.
patent: 5463765 (1995-10-01), Kakuta et al.
Patterson et al., "A Case for Redundant Arrays of Inexpensive Disks (RAID)", ACM SIGMOD 88, Jun. 1988, pp. 109-116.
"Trend, Technology, and Performance Evaluation of Disk Array Device", Nikkei Electronics, Apr. 26, 1993, pp. 79-103.
R. D. Pashley et al., "Flash Memories: the best of two worlds", IEEE Spectrum, Dec. 1989, pp. 30-33.

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