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Updating the source volume

After resynchronizing the source volume, you might want to ensure that all the latest changes are updated on the source volume before activating the source volume.

About this task

You must perform this task from the source cluster.

Run the snapmirror update command to update the destination volume of a SnapMirror relationship.

This command behaves differently for data protection (DP), extended data protection (XDP), and load-sharing (LS) relationships. It performs an incremental transfer.

For DP SnapMirror relationships with volumes being endpoints, the snapmirror update command makes the destination volume an up-to-date mirror of the source volume with the following steps:

  1. If the source volume is read-write, take a Snapshot copy on the source volume to capture the current image of the source volume.

  2. Find the most recent Snapshot copy on the destination volume, and validate that the corresponding Snapshot copy is still present on the source.

  3. Incrementally transfer Snapshot copies that are newer than the corresponding Snapshot copy to the destination volume.

Note
Using the snapmirror update command to update a set of LS mirrors will not work. To update a set of LS mirrors, run the snapmirror update-ls-set command.

For Vserver SnapMirror relationships, the snapmirror update command makes the destination Vserver an up-to-date mirror of the source Vserver. The snapmirror update command must be run from the destination Vserver or cluster.

Example

The following is an example for the destination volume to ensure that all the latest changes are updated on the source volume with unlimited throttle. This optional parameter throttle limits the network bandwidth used for the update transfer. It sets the maximum rate (in Kbytes/sec) at which data can be transferred during the operation. If this parameter is not specified, the throttle value configured for the relationship with the snapmirror create or snapmirror modify command will be used.

Also you can set other parameters, for example, adjust the transfer-priority and enable the storage-efficiency option for efficient data transfer to the destination volume.

Cluster1::> snapmirror update -destination-path vs1_dr:vol1 -throttle unlimited -transfer-
priority normal -enable-storage-efficiency true

Operation is queued: snapmirror update of destination "vs1_dr:vol1".

Cluster1::> snapmirror update -destination-path dvs1.example.com: