Patent ID: 7917713
Filing Date: 2011-03-29
Classification: G06F

Abstract:
1. A method of migrating data from a source device to a target device in a storage system, comprising: dividing a capacity of the source device into a plurality of sub-regions by a controller; locking the sub-regions from storage activity by the controller; establishing a mirroring relationship for write data updates between the source device and the target device by the controller; writing second data to the plurality of sub-regions in the source device by the controller; writing a first portion of the second data to first corresponding sub-regions in the target device if the first corresponding sub-regions have previously had first data copied from the plurality of sub-regions; assigning a local processor to copy a second portion of the second data from the source device to second corresponding sub-regions in the target device by the controller if the second corresponding sub-regions have not previously had first data copied from the plurality of sub-regions; and copying the second portion of the second data from the source device to second corresponding sub-regions in the target device, wherein copying comprises: