One other thing to consider. I forgot about this but it is something to think about.

vol copy does a block for block copy of the data. I'm guessing that you probably have 36GB or 72GB disks on your 840 and 4GB disks on your 330. Since the disk geometries are very different, your data on the 840 may be more fragmented (i.e. not in nice stripes) as a result of this block-by-block copy than it was on your 330. This *could* result in non-optimal performance.

Now if your data changes frequenly and you have a decent amount of free space on the F840 volume, WAFL will fix this over time and you may not even see it in the first place. But it is something to be aware of.

If you are concerned about this issue, you may want to consider moving the data via something like ndmpcopy which will re-stripe your data on the destination side.

Again, both methods work. Both have advantadges and disadvantages (for example, vol copy is usually quicker than ndmpcopy in my experience). What's important is that you make an informed decision on which way you go. There isn't necessarily a right or wrong answer here and many folks (customers and NTAP folks alike) have strong views one way or another (kind of like vi vs. emacs). So pick the way that you think works best for you. Both are good.

Hope this helps.

-- Adam Fox NetApp Professional Services, NC adamfox@netapp.com

-----Original Message----- From: Leonard, Roger [mailto:Roger.Leonard@marconi.com] Sent: Thursday, April 19, 2001 4:38 PM To: toasters@mathworks.com Subject: migrating data between filers

i am getting ready to migrate some data from 330's to an 840 using volcopy. has anyone done this out there and do you have any recomendations and/or gotchas?