On 28/09/2017 08:33, Rolf E. Sonneveld wrote:
> Hi,
>
> is there anyone working in a larger/'more demanding' environment, using NFS
> for his/her message store, where there is a business requirement of High
> Availability? If so, what commercial or open source storage solution is used?
> I have a similar requirement for a project and am looking for
> suggestions/options for what storage to use.
>
> Regards,
> /rolf
Most SP's have a need to HA, to avoid their support desks being flooded,
which doesnt look good,
NetApp and EMC have excellent options for backends, we use NFS as its
perfect, so long as using maildir and not mbox, we found NFS far more
overall reliable than a clustered filesystem in a uptime critical and
busy environment, and its a cinch to add/remove servers
multiple front ends, using, eg: postfix and dovecot, with mysql/mariadb
replicated on each server using a hardware load balancer, since we NFS
mount mail dir we use dovecots -lda and not lmtp, and do not use its
"director" service, which forces users to a specific machine.
With dovecot you can make filesystem efficient structure if you have a
lot of users, the one we use is
(I'll cheat - copy and paste) this format, which gives
[email protected] /vmail/example.com/j/s/m/jsmith
mail_location = maildir:/var/vmail/%Ld/%1Ln/%1.1Ln/%2.1Ln/%Ln/Maildir
on smtp/pop3 servers also add to above :INDEX=MEMORY - but dont ever
use that on imap
I'd suggest keeping outbound mail servers separate to inbound, and as
last bit of advice, given this is HA -
FFS, do NOT use virtual machines :)
--
Kind Regards,
Noel Butler
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