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Re: [Xen-users] How many guests

To: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Subject: Re: [Xen-users] How many guests
From: Michael Schmidt <michael.schmidt@xxxxxxxxxx>
Date: Sun, 06 Jun 2010 20:39:18 +0200
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Hi Jonathan,

the question is, what a kind of VM?
You can over-utilize a much greater machine with one VM.
Or on the other side, you can run 40 VMs on a shorter machine.

Each ressource can be a bottleneck

- Memory - this is realy easy to calculate: Avaiable minus 768MB (Reserved for 
Dom0 should be enugh in this case).
- CPU - Here we need a VM statistic
- Disk Bandwidth - Here we need a VM statistic, but in the most cases not the 
- Disk IOPS - Here we need a VM statistic, in the most cases the botelneck

What a kind of VMs you plane to run?
Webservers / mailservers / database-servers ...?

Best Regards

Michael Schmidt

Am 06.06.10 00:54, schrieb Jonathan Tripathy:
Hi Everyone,

I have a Dell R210 server which has a Xeon X3430 Quad Core CPU (2.4Ghz x 4) with 8GB of RAM. I intend to use the H200 controller in a RAID1 setup

How many VMs do you think I'd be able to run on this machine? Is 20 pushing it?

I'd say most (if not all) guests would be in PV mode.


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