Creating extra backup Snapshot copies for SnapMirror qtrees

You might want to create an extra backup Snapshot copy, on the source and destination in a SnapMirror qtree relationship. These Snapshot copies can serve as the newest common Snapshot copy in case a base Snapshot copy was accidentally deleted. You can also use them to resynchronize a SnapMirror qtree relationship to an earlier resynchronization point.

Considerations

You can create a manual Snapshot copy using the snap create command. Then, use the -c and -s options of the snapmirror update command together, to establish an extra backup Snapshot copy on both sides of a SnapMirror qtree relationship.

Steps

Enter the following command:snap create vol_name snapshot-name
vol_name is the name of the volume whose Snapshot copy you want to create.
snapshot-name is the name of the Snapshot copy.

Example
```
systemB> snap create vol2 my_snap
```
This creates a Snapshot copy, my_snap, of the volume vol2.
Enter the following command:snapmirror update -S source -s src_snap -c dest_snap destination
source is the name of the source.
src_snap is the name of the Snapshot copy on the source.

dest_snap is the name of the Snapshot copy on the destination.

destination is the name of the destination.

Example
```
systemA> snapmirror update -S systemB:/vol/vol2/qtree1 -s my_snap -c my_dest_snap vol/vol4/qtreeSafe
```

Parent topic: Manual update of a SnapMirror destination