Xen users - Feb 2012 - Is there a maximum limit for the domU memory ?

Hello everybody

The current limit (we''re working with Xen 4.0.1 on a debian squeeze 
server) for the domU memory is 256 Gb

Is it possible to do something to get domUs with more than that ?

Do we have to upgrade Xen hypervisor for that purpose or is a kernel 
recompilation sufficient ?

We would like to have a vm with 768 Gb memory...

Thanks for your kind answers !

-- 
Emmanuel COURCELLE                emmanuel.courcelle@toulouse.inra.fr
L.I.P.M. (UMR CNRS-INRA 2594/441) tel (33) 5-61-28-54-50
B.P.52627 - 31326 CASTANET TOLOSAN Cedex - FRANCE

On Wed, Feb 15, 2012 at 2:40 PM, Emmanuel COURCELLE
<emmanuel.courcelle@toulouse.inra.fr> wrote:
> Hello everybody
>
> The current limit (we''re working with Xen 4.0.1 on a debian
squeeze server)
> for the domU memory is 256 Gb
>
> Is it possible to do something to get domUs with more than that ?
Should be possible.
>
> Do we have to upgrade Xen hypervisor for that purpose or is a kernel
> recompilation sufficient ?
From my kernel''s config:
CONFIG_XEN_MAX_DOMAIN_MEMORY=128

Just adjust it as necessary and recompile the kernel
> We would like to have a vm with 768 Gb memory...
Check Oracle VM, IIRC they boast the ability to run a VM with lots of
domU CPU and memory, so they should have everything configured already
for what you want.

-- 
Fajar