Re: [Xen-users] Weird ram/dom-u limit problem

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Thu, Jan 21, 2010 at 2:20 AM, David Halik <dhalik@xxxxxxxxxxxxxxx> wrote:
> I'm hitting what
> *appears* to be some kind of wall on either the number of vm's or the amount
> of ram they're using (personally I think it's ram, but I don't see how).

Number of vms can be very high (even over 300).
Ammount of ram is something you can easily see

> loops = 64

are you using file:/ or tap:aio?

> Now, if I attempt to install an 8th vm with 512MB or ram on either server
> the install runs for awhile and then suddenly load on the xen server begins
> to grow and grow and grow. Going from a load average: 0.09, 0.15, 0.10 to
> load average: 10.58, 7.88, 4.70. The box itself begin to become very slow
> and bogged down. top shows that it's because of cpu iowait, but I can't find
> any particular reason for it.

try running "iostat -mx 3".
My guess is you're disk I/O bound.

-- 
Fajar

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