You should use:

dd if=/dev/zero of=/VM-storage/<guest name> oflag=direct bs=1M
count=4096


What is experimental is running 32-bit DomUs on 64-bit Dom0. If you run
everything on 64-bit or everything on 32-bit it is fully supported.

Regards,
 Daniel


-----Original Message-----
From: rhelv5-list-bounces@(protected)
[mailto:rhelv5-list-bounces@(protected)
Sent: Monday, January 21, 2008 9:55 AM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: RE: [rhelv5-list] Pegged IOwait and spiraling load average
withXenDomUs

On Mon, 21 Jan 2008, Zavodsky, Daniel (GE Money) wrote:

>  Have you allocated the whole "disk" file before creating the
DomU or
> are you using a sparse file?

dd if=/dev/zero of=/VM-storage/<guest name> oflag=direct bs=1M seek=4095
count=1

Which I reckon creates a sparse file. How do you suggest I do it
instead?


> I can run an iozone test in DomU without any problem (which certainly
> is much more disk IO intensive than scp). Even using LVM, MD and other

> setups in DomU does not appear to cause problems.

Hmmmm. So how're you creating the files in Dom) to be used by the
DomUs?


>  My HW/SW setup is the same as yours, but I am running everything
on
> 64-bit... it may behave differently on 32-bit.

Everything? I thought running the Dom0 and certainly the DomUs on
64-bit was the subject of my last email subject (i.e. that it wasn't
even Technology Preview quality)?

Ben
--
Unix Support, MISD, University of Cambridge, England Plugger of wire,
typer of keyboard, imparter of Clue
     Life Is Short.       It's All Good.

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