Raid level 5 with free blocks parity cache

Details Raid level 5 with free blocks parity cache Raid level 5 with free blocks parity cache

1994-05-05

1996-05-28

Beausoliel, Jr., Robert W.

Excavating

371 511, G06F 1134, G06F 1110

Patent

active

055220320

ABSTRACT:
A system for writing data to a disk array includes a cache memory coupled to the disk array for storing data indicative of locations on the disk array and parity blocks associated with parity groups including the locations. Each of the parity blocks includes an identifier indicative of locations within a particular parity group which are protected by the parity data. Write logic reads the identifier from the parity block, and based thereon, determines whether a disk location is not protected by the parity data. The write logic also writes to the location and updates the parity data and the identifier associated with the parity block to include the location of the data block to indicate that the location is protected.

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