Patent ID: 6546457
Filing Date: 2003-04-08
Classification: G06F

Abstract:
A method for reconfiguring, from an original configuration to a new configuration, a striped logical device distributed across a plurality of physical disk drives in a disk array storage device and responsive to input-output requests from a host application, said method comprising the steps of:A) 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) isolating the copy, C) converting the logical device to its new configuration whereby the host application thereafter can interact with the logical device in its new configuration, D) 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) 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 copy to location in the logical device identified by the input-output request.