Integrity protection for parity calculation for raid parity cach

Details Integrity protection for parity calculation for raid parity cach Integrity protection for parity calculation for raid parity cach

1995-02-15

1997-06-17

Beausoliel, Jr., Robert W.

Excavating

39518502, 371 491, G06F 1100

Patent

active

056405065

ABSTRACT:
An improvement on the use of parity and a write cache for a RAID by adding a check code for the parity data itself. In addition, the time during which the parity check code is unprotected is reduced by using a single loop to calculate the old parity check code and verify it, determine the new parity information itself from the new write data, and calculate the new parity check code. Rather than cycle through all the parity blocks to calculate the old check code, and verify that it matches what is stored, the old check code is reconstructed block-by-block as the new parity is generated for each block in a loop. In addition, the new parity check code is constructed bit-by-bit at the same time.

REFERENCES:
patent: 5121396 (1992-06-01), Irvin et al.
patent: 5341381 (1994-08-01), Fuller
patent: 5373512 (1994-12-01), Brady

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