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Re: [Xen-users] How many guest hosts per physical host

To: Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] How many guest hosts per physical host
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Tue, 22 Dec 2009 15:20:15 +0700
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On Tue, Dec 22, 2009 at 2:26 AM, Thiago Camargo Martins Cordeiro
<thiagocmartinsc@xxxxxxxxx> wrote:
> That's easy as 2+2=4!  ;-)

Well, not exactly :P

> You have 16384M of RAM memory in your Dell....
> In your grub's menu.lst file, setup up this:
> xenhopt=dom0_mem=512M
> Now you have 15872M for your domUs... Let's see:
> Setup each domU with 992M of RAM (~1G) so, you got 992*16=15872.

the hypervisor itself uses some memory. Also, as Pasi mention in
another thread, there's additional memory overhead when allocating
memory and every vcpu for domUs. So you're still missing some

In general it's correct though. If you set each domU to use lower
memory (about 900MB should do) you can still have a total of 16 domUs.


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