Hi,
I'm not sure how long volcopy will take. You will have to budget 8-10 hours minimum.
Thought I'd share some numbers on this with you:
F630 local volume copy (no load) ~36 GB/hr F630 -> F760 via GbE (no load) ~48 GB/hr F760 -> F760 via 100bT (load on source) ~28 GB/hr
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The second option to consider if you have NDMP backup in place Take a snapshot of Filer A Using NDMP backup Filer A. (This will take about 7 hours) Restore the back to Filer B. (This will take about 10-12 hours) Remove Filer A from the network.( rename it Filer C) Get a snapshot of Filer C. Backup any changes from Filer C since last backup.(this is an incremental backup) (This will take less than 1 hour) Restore the incremental backup to Filer B. (this will take about 1-1.5 hours) Filer B should look like Filer A data. This will keep all your associated ACL.
Alternatively, you can use NDMPcopy available on ftp://ftp.ndmp.org and skip writing/reading to/from tape. As outlined in the "Migrating Data Between NetApp Filers" white paper at:
http://www.netapp.com/technology/level3/3018.html
Cheers, Grant