Patent ID: 7260739
Filing Date: 2007-08-21
Classification: G06F

Abstract:
1. A program storage device readable by a computer and tangibly embodying one or more programs of instructions executable by the computer to provide continuous availability of data during volume set failures in a mirrored environment by: experiencing a failed volume set when a drive fails on a first storage subsystem; initiating regeneration of the failed volume set after detecting failure of a drive on the first storage subsystem; receiving an input/output request from a host for the failed volume set associated with the failed drive on the first storage subsystem during regeneration of the failed volume set; determining whether the failed volume set during regeneration of the failed volume set can service the input/output request directly; and providing continuous data availability by using the failed volume set to process the input/output request during regeneration of the failed volume set when the failed volume set can service the input/output request, else using a remote mirrored volume set to process the input/output request.