Method and means for managing RAID 5 DASD arrays having RAID DAS

Details Method and means for managing RAID 5 DASD arrays having RAID DAS Method and means for managing RAID 5 DASD arrays having RAID DAS

1991-07-03

1994-04-05

Kulik, Paul V.

Excavating

395575, 371 101, 364DIG1, 3649439, 36494461, 36494492, 3649456, 364957, 3649571, 364964, 364966, 364970, G06F 1206

Patent

active

053012976

ABSTRACT:
A method and apparatus teaching insertion of addressing indirection to form and to access an array hierarchy expressly permitting the concurrency of a high level RAID array, the bandwidth and degraded mode operation sustainable by a lower level RAID array, and after a DASD failure minimum spanning involvement when the array is rebuilding and rewriting missing data to a spare logical device. Also, disclosed are the accessing of variable length records on the array hierarchy; array hierarchy in which RAID 5 arrays have dissimilar number of logic devices (lower level RAID arrays) and interleave depths; formation of logical arrays using fractional storage defined onto real DASD subsets; and the defining of logical devices onto DASDs distributed in the same or different physical clusters of DASDs and the rebuild operation thereof.

REFERENCES:
patent: 4092732 (1978-05-01), Ouchi
patent: 4914465 (1990-04-01), Dunphy et al.
patent: 5263145 (1993-11-01), Brady et al.
patent: 5271012 (1993-12-01), Blaum
"A Case for Redundant Arrays of Inexpensive Disks (RAID)", Patterson, et al. Report #UCB/CSD 87/391, Dec., 1987, Computer Science Division Univ. of California, Berkeley.
Co-Pending Blaum, et al., "Method and Means for Coding and Rebuilding the Data Contents of Unavailable DASDs or Rebuilding the Contents of One DASD in Error in the Presence of a Reduced Number of Unavailable DADSs in a DASD Array" filed Jun 21, 1991 (IBM Ref. SA9-91-038).
"Providing Fault Tollerance In Parallel Secondary Storage Systems", Dept. Computer Science, Princeton Univ., Report CA-TR-057-86, Nov. 7, 1986, Park, et al.

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