Parity spreading to enhance storage access

Details Parity spreading to enhance storage access Parity spreading to enhance storage access

1986-06-12

1988-08-02

Ruggiero, Joseph

Excavating

371 38, G06F 1110

Patent

active

047617853

ABSTRACT:
A storage management mechanism distributes parity blocks corresponding to multiple data blocks substantially equally among a set of storage devices. N storage units in a set are divided into a multiple of equally sized address blocks, each containing a plurality of records. Blocks from each storage unit having the same address ranges form a stripe of blocks. Each stripe has a block on one storage device containing parity for the remaining blocks of the stripe. Further stripes also have parity blocks, which are distributed on different storage units. Parity updating activity associated with every change to a data record is therefore distributed over the different storage units, enhancing access characteristics of the set of storage devices. The parity updating activity also includes the use of an independent version number stored with each data record and corresponding version numbers stored with the parity record. Each time a data record is changed, its version number is incremented and the corresponding version number in the parity record is incremented with the parity record update.

REFERENCES:
patent: 3387261 (1968-06-01), Betz
patent: 4092732 (1978-05-01), Ouchi
patent: 4335458 (1982-06-01), Krol
patent: 4433388 (1984-02-01), Oosterbaan
patent: 4653055 (1987-03-01), Micic
patent: 4842262 (1984-11-01), Sullivan
IBM Technical Disclosure Bulletin, vol. 24, No. 2, Jul. 1981 "Efficient Mass Storage Parity Recovery Mechanism" F. D. Lawlor, pp. 986-987.

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