From: Ed W (listswildgooses.com)
Date: Thu Jun 05 2008 - 07:25:06 CDT

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Jake Vickers wrote:
> JOHN ROMAN wrote:
>> at my company we have the same requirement. Postfix with capable
>> hardware can easily on a standalone box handle this much mail
>>
>> with this much mail, you should consider clustering for availability
>>
>
> Can anyone offer any good links for reading on clustering Postfix? I
> searched some, but all the results I came up with recommended against
> using any shared file system like NFS for storing user's mailboxes
> (granted I only looked at links involving Maildir format). I'd be
> curious to read any articles on successful installations for this type
> of cluster.

I think it's webmail.us which has some articles on what they do.

It's really the imap bit which I think they are clustering, but what
they do is pair machines with two disk (arrays if you want) each and run
DRBD on each instance. So each pair is a running one real instance and
mirroring to the other instance. This way you have a running instance
and a warm failover on each box. If both boxes fail then you are out of
luck. If one box fails then you need to switch over the warm spare to
become live

Seemed like a good solution to me. I can see the attraction of a fancy
SAN being better for smaller sites, but their solution let them scale to
lots and lots of commodity boxes quite easily

Ed W

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