Fault-tolerant preservation of data integrity during dynamic rai

Details Fault-tolerant preservation of data integrity during dynamic rai Fault-tolerant preservation of data integrity during dynamic rai

1996-10-08

1999-02-23

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711 4, 711165, 711170, 711172, 711111, 39518204, 39518205, G06F 1202

Patent

active

058754571

ABSTRACT:
A method and apparatus for dynamically expanding an N drive RAID set to an M drive RAID set while maintaining data integrity, where the M drive RAID set includes one or more new drives. The method comprises the steps of identifying a destructive zone in the N drive RAID set including destructive zone data. Thereafter the destructive zone data is mirrored in the M drive RAID set by copying it to a free location in the N drive RAID set and to a location in a new drive in the M drive RAID set. Finally, the N drive RAID set is expanded to an M drive RAID set. Data integrity is assured in the N drive RAID set during migration by maintaining mirrored destructive zone data until the expansion step has completed migration of the destructive zone of the N drive RAID set.

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