Re: [Xen-users] How many guests

[Michael Schmidt <michael.schmidt@xxxxxxxxxx>]

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 
bottleneck
- 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.
>
> Thanks
>
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