It is possible to preserve snapshots and migrate data, but it's tedious
at best and
unpractical at worst, it just depends on your data.
You can use ndmpcopy or qtree SnapMirror (I prefer QSM if you have it).
But basically
you start with the oldest snapshot you want to keep. Migrate that
snapshot for each qtree
you want to migrate (or I suppose you can just do the volume if you are
doing ndmpcopy).
Then take a local snapshot on the destination flex vol (probably with
the same name).
Repeat this process with each snapshot you want to preserve. Basically,
you are
building them from the ground up. It works, but like I said, it's
tedious for most and
impossible for some.
Another alternative for those who don't want to go through this process
is to just copy
the active filesystem over using anything you want, then keep the older
disks around until
they would have been deleted anyway. Not sure how that would work with
your manual snapshots,
but some sites with time-based snapshots have found that to be more
practical, even if a bit
inconvient, for a few weeks/months.
Hope this helps.
-- Adam Fox
adamfox(a)netapp.com
-----Original Message-----
From: Michael Homa [mailto:mhoma@uic.edu]
Sent: Monday, June 05, 2006 3:51 PM
To: toasters(a)mathworks.com
Subject: Suggestions regarding migration from 740 to 270
Hi:
Recently, we elected to replace our primary 740 (we have two) with a
270.
The 740, running 6.4.5, has traditional volumes whereas the 270, running
7.0.4, has flex volumes. I'm using ndmpcopy to migrate volumes from the
old box to the new. My question concerns snapshots. I was told that I
can't use ndmpcopy to migrate the snapshot (if that's not true, feel
free to tell me). Anyway, we have some user-created snapshots that hold
important changes. I'm looking for suggestions on getting the
information contained in the snapshots migrated.
Thanks
Michael Homa
Operating Systems Support and Database Group Academic Computing and
Communication Center University of Illinois at Chicago
email: mhoma(a)uic.edu