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How the snapmirror resync command helps minimize data loss

The snapmirror resync command enables you to reestablish a broken SnapMirror relationship without a lengthy baseline transfer.

This command offers the choice of either source or destination to serve as the source in the restarted SnapMirror relationship. It finds the newest common Snapshot copy (NCS) shared by the two volumes or qtrees, and removes all newer information on the system on which the command is run.
Note: The snapmirror resync command requires that the two volumes or qtrees have at least one Snapshot copy in common. You can resynchronize a volume or qtree to any other volume or qtree as long as both have at least one Snapshot copy in common.

Resynchronization causes the loss of all data written to the destination after the base Snapshot copy was made. The snapmirror resync command informs you what data might be lost during the resynchronization and requests permission to proceed. If you want to save the data on the destination, you can stop the resynchronization, manually copy the desired data elsewhere, and reissue the snapmirror resync command to the destination.