Method and means for efficiently managing update writes and faul

Details Method and means for efficiently managing update writes and faul Method and means for efficiently managing update writes and faul

1997-09-02

2000-02-01

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711155, 711161, 707204, 714 6, G06F 1216

Patent

active

060214635

ABSTRACT:
In a subsystem for accessing addressable ECC-coded sectors of magnetic disk tracks subject to sector level redundancy group organization, a method is described for managing write updates to said sectors by maintaining a current set of all redundant sectors in a subsystem NVS buffer external to the DASD such that only a read access of the DASD sector to be modified need be made. This derives from the availability of the new record data and the old redundant sector information at the subsystem. The redundant sector is modified by logically combining the old redundant sector and the new and old data sectors and is saved to the buffer and asynchronously copied to DASD subsequently.

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