Method of tracking incomplete writes in a disk array and disk st

Details Method of tracking incomplete writes in a disk array and disk st Method of tracking incomplete writes in a disk array and disk st

1997-05-30

1999-04-06

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711112, G06F 1216

Patent

active

058931643

ABSTRACT:
A method of tracking incomplete writes in a disk array includes the steps of sequentially receiving a plurality of write commands which identify respective blocks in the array that are to be written; generating a list of expanded write areas for only those write commands which are received most recently, where each expanded write area encompasses the blocks that are to be written plus additional blocks which are likely to be written by subsequent write commands; modifying the list, each time a write command is subsequently received which writes a particular block that is not in any expanded write area in the list, by replacing one expanded write area with a new expanded write area that encompasses the particular block; and storing a replica of the list on a magnetic media each time the modifying step occurs.

REFERENCES:
patent: 5572661 (1996-11-01), Jacobson
patent: 5708668 (1998-01-01), Styczinski

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