Patent ID: 8793456
Filing Date: 2014-07-29
Classification: G06F

Abstract:
1. A method for switching a target in a disaster recovery configuration, comprising: receiving instruction to change a target in a disaster recovery configuration, the disaster recovery configuration comprising: receiving indication to switch the disaster recovery configuration to a new target volume located on a storage subsystem common to the original target volume; establishing an incremental point-in-time (PIT) copy relationship between the original target volume and the new target volume; executing the PIT copy until out-of-sync (OOS) tracks from the source volume to the original target volume are below a predetermined threshold; merging an incremental PIT bitmap 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; terminating the PIT copy relationship and the first remote mirror relationship; and 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.