Re: AW: [Xen-users] Use hard drive as physical mem for xen vm

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

If MySQL really needs that much memory, doing swapping externally to the guest 
would likely lead to awful performance (even if we could do it...), so you'd 
be shooting yourself in the foor.

Xen 3.0 will let you use all the 8Gig under PAE or x86_64 mode.

Cheers,
Mark

On Friday 11 November 2005 14:12, Oliver Neumann [New Identity AG] wrote:
> Hmpf, to bad. Thanks for your answer.
>
>
> -----Ursprüngliche Nachricht-----
> Von: Petersson, Mats [mailto:mats.petersson@xxxxxxx]
> Gesendet: Freitag, 11. November 2005 14:58
> An: Oliver Neumann [New Identity AG]; xen-users@xxxxxxxxxxxxxxxxxxx
> Betreff: RE: [Xen-users] Use hard drive as physical mem for xen vm
>
> The short answer is NO.
>
> In longer text: Xen has no idea about swapping, which is really what you
> want it to do [because you want Xen to say that there is 8GB of RAM
> where there really isn't]. In Xen, all management of swapping is done in
> the guest-OS, so Xen doesn't have any capability of managing swapping
> [in fact, Xen itself doesn't even have a hard disk driver in it].
>
> The only solution to your problem would be to have the required amount
> of physical memory for the server, i.e. 8GB (+ a little bit) if you run
> 2x 4GB servers on one machine.
>
> --
> Mats
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Oliver
> Neumann [New Identity AG]
> Sent: 11 November 2005 13:52
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Use hard drive as physical mem for xen vm
>
> Hi all,
>
> I've got a machine that should serve 2 XenUs as mysql cluster nodes with
> realy big memory consumption. As mysql cluster will need approx. 4GB
> memory
> on each XenU, I wondered if I could use hard disc space as memory for
> the
> XenU that appears as real physical memory within the VM. Swap is no
> alternative as mysql cluster nodes check the physical memory and if that
> is
> not enough, they will not work.
>
> How can I do that?
>
> Thanks for your help!
>
> Sincerly,
> Oliver Neumann
>
>
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