On Tue, 4 Apr 2000, Chris Thompson wrote:
1c. In addition, I'm thinking of breaking up my 14-disk filer from a RAID 13d+1p configuration into, say, two RAID groups and two volumes as 3d+1p and 9d+1p. (Multiple RAID groups are allowed per volume; I assume multiple volumes per RAID group is still disallowed?) The former would have the stuff I need snapshotted and the latter the stuff I don't. I have a churn rate of about 30-40%. Thoughts?
If you've got material with *markedly* different snapshot requirements, then multiple volumes is the way to go. It costs in the extra parity
Yes, that is the reason for my proposal to break up the single volume I have now. The churn rate of 30-40% on the entire filer is quite unnecessary; I only need to keep snapshots on a few of the development sandboxes; the other 10-20 don't need them. But, I must snapshot them all because they are all on the same volume currently.
However, it appears from a private email from a NetApp person that a 4 disk volume (3d+1p) is sub-optimally tuned, and could result in vastly decreased performance.
discs, of course. (I notice you have no hot spares mentioned in your alternative configurations above, so I guess you are already somewhat desperate for space.)
Whoops. Make that:
1c. In addition, I'm thinking of breaking up my 14-disk filer from a RAID 12d+1p+1hs configuration into, say, two RAID groups and two volumes as 3d+1p and 8d+1p + 1hs. ...
Until next time...
Todd C. Merrill The Mathworks, Inc. 508-647-7000 x7792 3 Apple Hill Drive, Natick, MA 01760-2098 508-647-7001 FAX tmerrill@mathworks.com http://www.mathworks.com ---