Darren J Moffat wrote:
Brian H. Nelson wrote:
For several reasons we currently need to stay on UFS and can't switch to ZFS proper. So instead we have opted to do UFS on a zvol using raid-z,

Can you state what those reasons are please ?

I know that isn't answering the question you are asking but it is worth making sure you have the correct info.

I'd also like to understand why UFS works for you but ZFS as a filesystem does not.


I knew someone would ask that :)

The primary reason is that our backup software (EMC/Legato Networker 7.2) does not appear to support zfs. We don't have the funds currently to upgrade to the new version that does.

The other reason is that the machine has been around for years, already using UFS and quotas extensively. Over winter break we had time to upgrade to Solaris 10 and migrate the volume from svm to zvol, but not much more.There are a few thousand users on the machine. The thought of transitioning to that many zfs 'partitions' in order to have per-user quotas seemed daunting, not to mention the administrative re-training needed (edquota doesn't work. du is reporting 3000 filesystems?! etc).

IMO, the quota-per-file-system approach seems inconvenient when you get past a handful of file systems. Unless I'm really missing something, it just seems like a nightmare to have to deal with such a ridiculous number of file systems.

-Brian

--
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Brian H. Nelson         Youngstown State University
System Administrator   Media and Academic Computing
             bnelson[at]cis.ysu.edu
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