Hi,
You need to run the floowing command from the destination of the snapmirror
snapmirror quiesce *
To stop the snapmirror replications on all SVM's or replace the * with the specific SVM you're looking to stop replication on.
Te resume use
snapmirror resume *
srom the same cluster (the destination of the snapmirror)
An example of where I've used this would be during DR tests where you want to pause replication during network isolation of a specific site.