I don't personally manage any really large hosts (I have worked on a
few), but I expect that Délsio is correct.
As the server gets 'busy' (tens of concurrent smtp sessions), a little
tuning may be required, regarding the number of spamd processes going.
Scanning is what taxes the CPU. With spamdyke the number of messages
that are actually scanned is on the order of 10% or less of the total
messages that hit the server, so this isn't as much of a concern as it
used to be. Spamdyke reduces the load on QMT hosts *dramatically*. I
wouldn't run a mail server without it. Unfortunately, but lucky for us,
it's only available with qmail.
On the client side (MUA) of things, the numbers depend on pop3 vs imap
users, and their connection patterns. As the number of imap users grows
(and it will, as imap is generally displacing pop3), disk space usage
obviously grows.
QMT does scale nicely. Various "pieces" can be offloaded to separate
hosts as the load begins to affect performance. At this point, an
evaluation needs to be made in order to split things up in a way that
achieves a good balance. Bill Shupp has a nice model here:
http://www.shupp.org/maps/ispcluster.html
Personally, I do run webmail (squirrelmail-toaster) on a separate host.
I think that's a good place to start.
--
-Eric 'shubes'
On 12/01/2011 08:08 AM, Dave wrote:
Thanks for the reply.
Any one else care to share their setups, eg how much
CPU, RAM, Domains . Users
Thanks all
On 12/1/2011 4:46 AM, Délsio Cabá wrote:
Hi Dave,
I am running Qmail for 04 years now and I started with a workstation.
Today I still have a small server - ML 110 G6.
I have 8Gb RAM and RAID 1 configuration.
As far sa I know Qmail is deployed for large scale usage (Large
companies 7 ISP) and is scales pretty well.
I can't give you an exact number but I am sure it can handle thousands
of domains.
Regards
On 30 November 2011 23:43, Dave <[email protected]
<mailto:[email protected]>> wrote:
Is there a MAX limit to how many domains and users that the
Qmailtoaster server can handle,
I guess it is just dependent on hardware on the server:
eg:
I have a Quad CPU Pentium 4, with 4GB Ram, 500GB hdd
running qmailtoaster.
How may users/domains should it be able to handle?
Thanks
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