Patent ID: 8799602
Filing Date: 2014-08-05
Classification: G06F

Abstract:
1. A system, comprising: a source volume from which data is copied in a first remote mirror relationship, the source volume being accessible to an application; a storage subsystem, comprising: logic configured for receiving instruction to change a target in a disaster recovery configuration comprising the source volume and the original target volume; logic configured for receiving indication to alter the disaster recovery configuration to copy data from the source volume to the new target volume instead of the original target volume; logic configured for establishing an incremental point-in-time (PIT) copy relationship between the original target volume and the new target volume; logic configured for executing the PIT copy until out-of-sync (OOS) tracks from the source volume to the original target volume are below a predetermined threshold; logic configured for merging an incremental PIT backup representing the PIT copy relationship between the original target volume and the new target volume with a first remote mirror bitmap representing the first remote mirror relationship between the source volume and the original target volume to create a merged remote mirror bitmap; logic configured for terminating the PIT copy relationship and the first remote mirror relationship; and logic configured for establishing a second remote mirror relationship between the source volume and the new target volume using a resynchronization option that uses the merged remote mirror bitmap.