Patent ID: 6718437
Filing Date: 2004-04-06
Classification: G06F

Abstract:
A program that reconfigures, from an original configuration to a new configuration, a striped logical device in a disk array storage device and that responds to input-output requests from a host application, said program comprising:A) a process for making a copy of the striped logical device in the original configuration concurrently with operations between the host application and the logical device in its original configuration, B) a process for isolating the copy, C) a process for converting the logical device to its new configuration whereby the host application thereafter can interact with the logical device in its new configuration, D) a process for transferring data from the isolated copy to corresponding locations according to the new configuration concurrently with operations between the host application and the logical device in its new configuration, and E) a process for responding to an input-output request from the host application for non-transferred data according to the new configuration by transferring data from a corresponding location in the isolated copy to location in the logical device identified by the input-output request.