SnapMirror requires that you offline the destination volume only for the initial transfer.
If you do it for incremental transfers, it will do a full update instead of an incremental update and that will take longer.
mikef
i am snapmirroring between a 740 with 5.3 and a 840 with 6.0. the initial snapmirror went ok and i set up for it to refresh again tonight. my question is, will the target volume automatically go offline or do i need to manually offline it? i manually offlined it before and it onlined it by itself when it was done mirroring.
thanks
roger leonard