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Re: [Xen-users] Live migration problem

To: "Pim van Riezen" <pi@xxxxxxxxxxxx>

From: "Todd Deshane" <deshantm@xxxxxxxxx>

Date: Sat, 19 Jan 2008 01:23:47 -0500

Cc: Alain BARTHE <alain.barthe@xxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx

Delivery-date: Fri, 18 Jan 2008 22:24:29 -0800

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List-id: Xen user discussion <xen-users.lists.xensource.com>

On Jan 10, 2008 10:33 AM, Pim van Riezen <pi@xxxxxxxxxxxx> wrote:

On Jan 10, 2008, at 10:53 , Alain BARTHE wrote:

>
> Hi,
>
> We have a dozen of dom0, running about 50 domUs. All domUs have
> disks on LVM, disks are located on a SAN, so it is very easy to live
> migrate simply by attaching a domU disk on two dom0s.
>
> All dom0s run CentOS50 with Xen 3.0.3.
>
> We tried many time to migrate in vitro some little domUs and it
> worked perfectly.
>
> Now we really need to migrate a big domU (big by its RAM: 3.6 GB)
> and we have the following error (log on the from dom0):

Your problem is probably that live migration requires Xen to create a
shadow copy of the active RAM of your DomU, so you effectively need to
have RAM(DomU) free on the source and 2*RAM(DomU) on the target Dom0.

It shouldn't be 2*RAM. From what I have read, the amount of memory needed equals the amount of memory allotted to the guest on the source host plus an additional 8MB of temporary storage .

I don't yet have a guess as to why it is actually failing though.

Cheers,
Pi

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