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Re: [Xen-devel] Migration of paused domains
- To: "Steven Hand" <Steven.Hand@xxxxxxxxxxxx>
- From: "Jayesh Salvi" <jayeshsalvi@xxxxxxxxx>
- Date: Thu, 3 Aug 2006 12:42:19 -0500
- Cc: Rob Bradford <rob.bradford@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 03 Aug 2006 10:42:54 -0700
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There was a discussion on these lines sometime back.
http://lists.xensource.com/archives/html/xen-devel/2006-05/msg00521.html
On 8/3/06, Steven Hand <Steven.Hand@xxxxxxxxxxxx> wrote:
> I'm not sure if this is a real bug or not, but when attempting to test
> my block device migration system I pause the domain to ensure that no
> more writes to the backing block device will occur.
>
> Unfortunately if the domain is pause an xm migrate command simply leads
> to the xm migrate command hanging. I would have thought it should be
> possible to migrate a paused domain. Is this a bug or is there a real
> problem with trying to migrate a paused domain?
There is a problem in migrating (or saving) a paused paravirtual
domain - the guest OS needs to be 'aware' that it is being suspended
so that it can ensure there are no stale mfns lying around (since
these will no longer be valid after the resume / on the destination
node).
cheers,
S.
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Jayesh
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