SnapMirror creates replicas of volumes hosting LUNs. SnapMirror mirrors a snapshot of data on a source volume to one or more volumes configured as destinations of the source volume. SnapMirror can replicate a source volume to a destination volume on the same filer or to a different filer. When you use SnapMirror to replicate volumes from one filer to another, the destination filer can be in a different geographical location. This ability to duplicate data in different locations is a key component of a sound disaster recovery plan.
Data stored in a mirror on a destination volume can be accessed through SnapDrive. Because the mirror is volume wide, snapshots of other data sets on the source volume are mirrored also.
SnapMirror updates the destination volumes to reflect incremental changes on the source volume. The result of this process is an online, read-only destination volume that contains the same data as the source at the time of the most recent update.
Caution
Because SnapManager uses SnapMirror in asynchronous mode, any disk writes that occurred on the source volume after the most recent SnapMirror replication update are not available if a catastrophic failure occurs before the next update. This is because they were not replicated to the SnapMirror destination volume.
To use SnapMirror with SnapManager, you must have previously configured SnapMirror on both the source volume to be replicated and its destination volumes. How to complete these tasks is explained in your SnapDrive documentation. Your configuration must satisfy the following requirements:
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File: mirror2.htm
Last updated: Tue Jun 15 15:34:13 2004