NetApp
SnapMirror : Managing SnapMirror relationships : Resynchronizing SnapMirror relationships
Resynchronizing SnapMirror relationships
You can use the Protection window to reestablish a SnapMirror relationship that was broken. You can perform a resynchronization operation to recover from a disaster that disabled the source or to change the current source to a different volume or qtree.
About this task 
When you perform a resynchronization operation, the contents on the SnapMirror destination are overwritten by the contents on the source. The resynchronization operation can cause data loss on the destination.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click SnapMirror.
3.
Select the SnapMirror relationship that you want ot resynchronize.
4.
Click Operations > Resync.
5.
Select the confirmation check box and click Resync.