We have several standalone mail servers running with
postfix/cyrus/maia.
For your load I would suggest dual CPU (dual core is fine),
2-4GB RAM,
and at least 72GB of storage space. More than 144GB is
probably not
necessary unless you have some huge mailboxes or most of
your users are
using IMAP/Webmail. A single RAID 5 array with 3-4 drives is
simple and
should manage fine, get a hot spare if you have the means.
The thing with MySQL is that it caches a lot of information
in RAM, the
big disk IO hit is actually going to be coming from
postfix/sendmail
which store all their information in the file system. The
main disk
usage culprits are going to be mailboxes themselves, log
files (amavis,
postfix, your pop server) and your maia mail table which
stores
quarantined/cached emails. You can cut down on mailboxes by
implementing
user quotas. Log files can be rotated by logrotate, but you
may have to
setup specific log rotate scripts for services which don't
come with
them. And lastly you can cut down on the mail that maia
caches in the
database by lowering your "oversized mail item"
setting (nearly 100% of
spam and virus are under 500kb) and by clearing old messages
on a weekly
basis.
I don't have experience storing working data across SAN or
NFS, simply
because a standalone server has always been more than enough
to handle
the loads of messages that I've seen (~120,000 msg/day).
While you can
use a separate db/web server, the load of these functions
hasn't been
enough (for us) to justify the downsides (overhead, latency,
reliability) of moving them to a separate box from the MTA.
--Blake
logs wrote:
> David, I am in the same boat as you currently design
infrastructure to implement a large scale Maia operation for
about 3000 residential subscribers.
>
> My biggest concern at the moment is the database setup
and if I want an exclusive machine to handle database
connections for the two mail relays. And what the
implications of this would be as all the spam assassin rules
are held within the database.
> If anyone has any input on this please advise.
> I love maia and it's capabilities.
> Adam
> -----Original Message-----
> From: maia-users-bounces renaissoft.com
[mailto:maia-users-bouncesrenaissoft.com] On Behalf
Of David Morton
> Sent: May 18, 2006 12:45 PM
> To: Aaron Bennett
> Cc: maia-usersrenaissoft.com
> Subject: Re: [Maia-users] disk suggestions for
large-scale maia implementation
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Aaron Bennett wrote:
>
>> Hello,
>>
>> I'm planning a reasonably large maia
implementation -- about 3000
>> users. I've got two mail relays which will run
amavisd-maia and I'm
>> purchasing a small box as a web server -- something
like a dl360, 3.8Gz
>> Xeon.
>>
>
>
>> We accept about 60,000 emails in a day. That's a
substantial amount of
>> transactions. What I'm trying to decide is
between one of three options...
>>
>
> In my experience, everyone worries too much about the
database. Let's ask
> another question: Has anyone had any database load
problems yet? 
>
> I'm just guessing, but I think any of those solutions
will work fine. I've run
> 25k to 50k messages through a single server that housed
sql/web/amavisd-maia...
> everything. 1GB RAM, 2 software mirrored SATA 10k
Raptors.
>
> On a similar note; In my experience a set of SATA WD
Raptors has smoked a
> similar Ultra320 setup. I thought SCSI was supposed to
be the champ here; has
> anyone else seen this?
>
> A project I'd like to set up is to make a test feed to
pump as much mail through
> a server as possible to make some benchmarks. Does
anyone have any hardware to
> donate?
>
> - --
> David Morton
> Maia Mailguard - http://www.maiamailguard
.com
> Morton Software Design and Consulting - http://www.dgrmm.net
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