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Re: [Xen-users] How Many domUs on a Host

To: Mohammed King <mohammed.king@xxxxxxxxx>
Subject: Re: [Xen-users] How Many domUs on a Host
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Wed, 23 Dec 2009 08:57:51 -0800
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On Tue, Dec 22, 2009 at 11:45 PM, Mohammed King <mohammed.king@xxxxxxxxx> wrote:
Hi guys,

Looking for some guide lines to find out how many domUs I can host on a server. I have a Dual Quad Core (8 cores) server with 32GB of RAM. Currently I have allocated 512MB of RAM to dom0 and distributed the rest to 89 domUs with 1 VPU each and LVM as my backend. I was able to get all 89 running with no problems. I ram some test with stress and bonnie++ in a group of domUs and dom0 and other guests does not seam to be effected.

However, I could be evaluating this incorrectly. Are there any tools or guidelines to confirm these results or do better performance analysis? My main concern is I/O and CPU usage.

Thank you 
Mohammed King
Systems Administrator
No condition is permanent

It depends on what the DomUs are doing. I run 42 interactive gui sessions on a very similar machine and it's pretty well tapped.

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.

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