Hi Simon,
On Mon, Jul 28, 2008 at 12:08 PM, Simon Vallet svallet@genoscope.cns.fr wrote:
Hi,
we just received a new 3140 cluster here to upgrade an existing 3020c production filer. And now we're looking for a way to migrate the existing data (~18TB) with the least possible downtime.
Ideally, we would use SnapMirror to copy the data on the new filer and then transparently (for clients) switch the production system, similarly to what happens when a cluster member fails over to the other member. But we don't know if this is possible.
So the questions are:
- do you think such a procedure could be successful ?
- do you have any other ideas to migrate the data without service
interruption ?
I've done this a dozen times, and it's succesfull, however not entirely without downtime. When switching over, you will need to do a last mirror update to catch the last changes with CIFS disabled on the source filer, this usually means a few seconds per volume of downtime and a few hickups when reconfiguring the paths to CIFS shares. If you want me to, I could write you down the basic steps you take to be sure that you will not lose any client data.
Without any interruption, we usually use HSM-like configurations such as Acopia (now F5) and the likes have.
HTH & HAND,