Disk array with parity data storage on the radially inner part o

Details Disk array with parity data storage on the radially inner part o Disk array with parity data storage on the radially inner part o

1995-08-15

1998-04-07

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

39518204, G06F 1200, G06F 1110

Patent

active

057377413

ABSTRACT:
A RAID system includes an array of disk units, with data mapped on to the disks as a series of stripes, each containing data and parity chunks. The data chunks of each stripe are located on radially more outer parts of the disks and the parity chunks of each stripe are located on radially more inner parts of the disks. As a result, the amount of head movement for read operations is reduced, which improves the read performance. Successive chunks within each stripe are physically located at successively more radially inward positions on successive disks, so that each stripe has a helical configuration. Mirroring can be considered as a special case in which the number of data chunks is equal to the number of parity chunks, and the parity consists of a simple replication of the data. In this case, data is written to the outermost half of a first disk and to the innermost half of a second disk, and is read from the first disk.

REFERENCES:
patent: 5321826 (1994-06-01), Ushiro
patent: 5432922 (1995-07-01), Polyzois et al.
patent: 5537567 (1996-07-01), Galbraith et al.
Ganger, "Disk Arrays High-Performance, High Reliability Storage Subsystems", Computer, vol. 27, No. 3, Mar. 1994, pp. 30-36.
Lee, "Performance Consequences of Parity Placement in Disk Arrays", Computer Architecture News, vol. 19, No. 2, Apr. 1999, pp. 180-199.
Gray, "Parity Striping of Disk Arrays: Low-Cost Reliable Storage with Acceptable Throughput", International Conference on Very Large Data Bases, Aug. 13, 1990, pp. 148-161.

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