Reversing a communication path between storage devices

摘要

Reversing a communication path between a first volume on a first storage device and a second volume on a second storage device includes suspending communication between the first and second volumes while maintaining operations for other volumes of the storage devices, causing the first volume to change from a source volume to a destination volume without destroying the first volume, causing the second volume to change from a destination volume to a source volume without destroying the second volume, and resuming communication between the first and second volumes. Causing the first volume to change from a source volume to a destination volume may include modifying a table of the first storage device. Causing the second volume to change from a source volume to a destination volume may include modifying a table of the second storage device.

主权项

1. A method of accessing mirrored data after reversing a communication path between a first volume on a first storage device and a mirrored second volume on a second storage device, comprising:
allowing access to the mirrored data prior to synchronizing the mirrored data between the first volume and the second volume; if an initial version of the mirrored data is provided on the first volume, accessing the mirrored data on the first volume; if the initial version of the mirrored data is provided on the second volume and the initial version of the mirrored data has been copied from the second volume to the first volume, accessing the mirrored data on the first volume; and if the initial version of the mirrored data is provided on the second volume and the initial version of the mirrored data has not been copied from the second volume to the first volume, accessing the mirrored data on the second volume prior to synchronizing the mirrored data between the first volume and the second volume.