Re: [Xen-users] Test - how many XEN VPS can run on my server

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 24, 2010 at 10:44:40AM +0700, Fajar A. Nugraha wrote:
> On Mon, May 24, 2010 at 1:30 AM, Shvayakov A. <a.shvayakov@xxxxxxxxx> wrote:
> > I want to know how many XEN VPS can run on my server:
> > CPU: 2 x Xeon X5650  2.67GHz
> > MEMORY: 36Gb
> > HDD: Adaptec 5405Z MaxIQ (SSD Cache) RAID10 2TB
> 
> > Up to 30 VPS, I observe a smooth change of parameters, but after 30 VPS
> > the  tests results are beginning to jump
> 
> How did you determine that? apache benchmark results?
> 
> > and  I can see that much of the
> > VPS is blocked.
> 
> "r" is shown when a domU actually uses a CPU. Since you have two 6 (?)
> core CPUs, if you enabled hypterhread, it might show up to 24 domUs in
> "r" state. It's normal that other domUs will be in "b" state.
> 
> > I have not much experience with XEN
> > This is normal, 30 VPS is my limit, or I have a bug?
> 
> I'd start by looking at disk statistics. It's possible that you're
> running out of disk IOPS. Try "iostat -x 3" on dom0, and see if disk
> utilization is at 100%.
> After that, look at dom0's memory and CPU usage. Is dom0 CPU usage at
> 100%? is dom0 using swap?
> 

Also: http://wiki.xensource.com/xenwiki/XenBestPractices

-- Pasi


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