I have read much of the imapd docs, and some of the email threads on this
list, so yes, I've seen "NFS is bad".
However .. we bought a fancy expandable storage system from Sun which has
a native ZFS filesystem exported as NFS, CIFS, HTTP, iSCSI.
We'd like to use it for email from a Linux client (i.e. the mailserver
uses it for user mail directories), as our in-chassis array is full.
We tried Linux XFS over iSCSI on RHEL4, which crashed and burned quickly.
Then we used Linux ext3 over iSCSI, which seemed OK for a couple of weeks
but then bombed. It's possible the iSCSI support in RHEL5 is better; we have other
machines running with that, but not doing mail with that kind of load
pattern.
If we used NFS, then it might (?) be more reliable, and the device could
use snapshotting for backups, which is built into its management
interface.
What are the chances of this working ? There would be no sharing of
files with any other NFS clients, just the one disk mount.
How about other imap servers such as Dovecot ? Apparently it alleges
it's NFS-safe, but one the posts here casts doubt on that.
--
Andrew Daviel, TRIUMF, Canada
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