Re: [Xen-users] Use of memory on Dom0 ?

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

On Thu, Feb 11, 2010 at 10:04 PM, Olivier B. <xen.list@xxxxxxxxx> wrote:
> Hi,
>
> I have two hosts with 48GB of memory. On each of them I will run multiple
> DomU which will use near 24GB of memory : I keep 24GB of unused memory on
> each servers to allow migrate of all VM on only 1 host.
>
> So my question : is there a usefull way to use the 24GB of memory on the
> dom0 ? As a "big" disk cache for example ? (but all my domUs use drbd
> devices...).

What kind of domU are you running? If it's PV, you should be able to
use "memory" and "maxmem". So for example you have this on domU config
file

memory = "1000"
maxmem = "2000"

It will start with 1000MB memory, but you can extend it up to 2000 MB
online with "xm mem-set" without having to reboot domU. When you need
to migrate some domUs, you can reduce its memory usage back to the
original.

-- 
Fajar

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