Failing Over to a Mirror Volume

When a disaster occurs at a primary datacenter, data can no longer be written to the volumes in that location, and the mirror operation cannot be performed. In order to maintain business continuity, the administrator at the secondary datacenter promotes the read-only mirror volume to a read-write volume, which breaks the mirror relationship. At this point, the promoted mirror volume contains all the data that was on the source volume at the time of the most recent successful mirror operation.

The following sections provide information about how to fail over to a mirror volume: