Re: [Xen-users] Hardware requirements for Xen

[Steve Thompson <smt@xxxxxxxxxxxx>]

On Mon, 4 Jun 2012, baileyp@xxxxxxxxxxxxxxxxxx wrote:

> Â  Â So, in short -- I'm looking to replace about 30 WinXP desktops with VM's 
> hosted by Xen, and I
> need to figure out how much memory and CPU power I'll need to make this 
> feasible.
I am running 31 KVM VM's on a Dell R710 server with CentOS 5.8. The server 
has 8 cores at 3.06 GHz and 48 GB memory and has hyperthreading turned on 
(for 16 logical cores total). The server has a lot more CPU bandwidth than 
required _for my workload_, except possibly when all the VM's are booting 
at the same time. In normal production use, the CPU usage rarely goes over 
25%. But of course if your VM's are all running a CPU-intensive workload 
at the same time, you will want a core for each of them. If I did it 
again, I'd use just 4 cores and maybe 64 GB memory. But pay particular 
attention to your disk storage; I am using four 450 GB 15K RPM SAS disks 
in a RAID-5 configuration; this is _just_ enough I/O bandwidth. I used to 
run Xen on this server before I switched to KVM, and the CPU requirements 
were considerably higher then.
Steve

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