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[Xen-users] mail server on a xen guest?

To: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] mail server on a xen guest?
From: "Peter Peltonen" <peter.peltonen@xxxxxxxxx>
Date: Sat, 5 Jul 2008 19:25:08 +0300
Delivery-date: Sat, 05 Jul 2008 09:25:44 -0700
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I'm building a new qmail based mail server. I now have a quad-core
server with 8 gigabytes of RAM and RAID-5 disk setup. I need to run a
virtual web server on that host too, so I'm installing Xen on that
host.  What I am wondering now is should I install qmail also on a
virtual server (domU) or on the master server (dom0)? Has anyone
experience about running qmail under xen domU? I could dedicate 1-2
cores for the qmailtoaster domU and lots of RAM, but I'm a bit worried
about disk I/O, as I've read that this can be a bottleneck in Xen. I'd
like to hear stories like "I've run mail server on a domU with 100
active domains and 10 000 incoming messages a day without problems)"


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