Hello Toasters,

This is just a little procedure that I figured out by trial and error.

I needed to migrate some snapmirror destination volumes on a nearstore to other aggregates on the same nearstore. With a few modifications, this procedure will also work when moving a volume to a different nearstore filer.

To avoid load on the primary storage filer I ran the full snapmirror copy (snapmirror initialize) locally on the nearstore filer. However, this left me with a snapmirror snapshot that was not deleted automatically and required deletion by hand.

Here is the procedure. Assume oldvol on a nearstore filer is being snapmirrored from a primary storage filer. You want to move oldvol to a different aggregate on the nearstore.

On the nearstore (destination) filer do this:

vol create newvol newaggr XXXXg vol restrict newvol

Now do the full snapmirror locally:

snapmirror initialize -S oldvol newvol

You may want to comment out your snapmirror.conf line for oldvol to avoid numerous logged errors if a scheduled snapmirror (from primary) of oldvol fails due to oldvol being busy.

When the full copy is done, replace oldvol with newvol.

vol offline oldvol vol destroy oldvol vol rename newvol oldvol

Un-comment your snapmirror.conf line for oldvol and wait a bit for the filer to notice the change. Then snapmirror update from primary storage:

snapmirror update oldvol

Yes, this actually works.

You want to update so that another snapmirror snapshot is created in oldvol. In addition to this snapshot you have a previous snapmirror snapshot that is locked and will not be deleted automatically.

snap list -n oldvol

The locked snapshot is marked "(snapmirror)". You need to delete it by hand, but you cannot do this without breaking the mirror:

snapmirror break oldvol

snap delete oldvol lockedsnapshotname

Also delete this same snapshot from the source volume. Run this on the primary filer:

snap delete oldvol lockedsnapshotname

Now re-establish the mirror on the nearstore:

snapmirror resync oldvol

And you're done.

Steve Losen scl@virginia.edu phone: 434-924-0640

University of Virginia ITC Unix Support