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Breaking SnapMirror relationships

If a SnapMirror source volume becomes unavailable and you want to access the data from the SnapMirror destination volume, you must break the SnapMirror relationship. Access to the destination volume is changed from data protection (DP) to read/write (RW).

Before you begin

About this task

You can use the destination volume to serve data while you repair or replace the source, until you can reestablish the original SnapMirror relationship configuration.

SnapMirror relationships are listed and managed from the Vserver that contains the destination volume.


  1. From the home page, double-click the appropriate storage system.
  2. Expand the Vservers hierarchy in the left navigation pane.
  3. Select the Vserver that contains the destination volume, and then click Protection.

    Screenshot showing the System Manager navigation pane with Protection selected.
  4. Select the SnapMirror relationship that you want to break and verify that the Transfer Status column displays either Idle or Quiesced.
    If the relationship needs to be quiesced, click Operations > Quiesce.
  5. Click Operations > Break .
  6. Select the confirmation check box, and then click Break.

    Screenshot showing the Break dialog box.
  7. Verify that the Relationship State column displays Broken Off.

    Screenshot of the Protection page list showing the SnapMirror Relationship State as Broken Off.
  8. Redirect client applications to the destination volume.
    The procedures for redirecting clients vary depending on the configuration of your environment. See the Data ONTAP documentation for more information.


The SnapMirror relationship is broken. The destination volume type changes from data protection (DP) read-only to read/write (RW). The system stores the base Snapshot copy for the data protection mirror relationship for later use.

After you finish

The best practice is to pre-mount the destination NAS volumes into the destination Vserver namespace as part of your disaster recovery configuration. If this was not done, you need to mount the volumes after breaking the SnapMirror relationship, to ensure that the volumes are accessible on the destination. You mount them into the namespace using the same junction path that the source volume was mounted to in the source Vserver. For details, see the task for mounting FlexVol volumes in the System Manager online Help.