choosing a file system

[LALOT Dominique]

Hello,

We are using cyrus-imap for a long time. Our architecture is a SAN from EMC
and thanks to our "DELL support" we are obliged to install redhat. The only
option we have is to use ext3fs on rather old kernels. We have 4000 accounts
for staff and 20000 for students
The system is rather fast and reliable. BUT..

Once, there was a bad shutdown corrupting ext3fs and we spent 6 hours on an
fsck.
Next we discovered that our backup system was going slower and slower. We
just pointed out that it was due to fragmentation, and guess what, there's
no online defrag tool for ext3.

I'm looking for other solutions:
ext4fs (does somebody use such filesystem?), xfs
zfs (but we should switch to solaris or freebsd and throw away our costly
SAN)
use a NetApp Appliance (are you using such a device?, NFS seems to be tricky
with cyrus..)

Thanks for your advice

Dom

-- 
Dominique LALOT
Ingénieur Systèmes et Réseaux
http://annuaire.univmed.fr/showuser?uid=lalot
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