[libvirt-users] Regarding persistence of VM's after live migration (virDomainMigrateToURI() problem)

[Coding Geek]

On Wed, May 2, 2012 at 7:42 PM, Cole Robinson <crobinso at redhat.com> wrote:

> On 05/02/2012 04:52 AM, Coding Geek wrote:
> >
> >
> > On Mon, Apr 30, 2012 at 9:07 PM, Cole Robinson <crobinso at redhat.com
> > <mailto:crobinso at redhat.com>> wrote:
> >
> >     On 04/25/2012 07:06 AM, Coding Geek wrote:
> >     >
> >     > Hello
> >     > I am working with 3 host machines each running xen with shared NFS
> >     storage. I
> >     > am working on automatic load balancing if one host is over
> utilized and
> >     > another is under utilized by measuring the utilization from
> xentop. I am
> >     > facing a problem after migration of VM. I am setting the flags (
> 1| 8|
> >     16) in
> >     > order to do live migration, persist VM on destination, undefine
> host from
> >     > source. After migration if I shut off the migrated VM on
> destination host it
> >     > does not persist. I am using the migrateToURI() API for migration.
> >     >
> >     > Please help how to make VM persist on destination.
> >     >
> >
> >     There's a flag you can pass to the migration API,
> VIR_MIGRATE_PERSIST_DEST.
> >
> >     - Cole
> >
> >
> > Actually I am already using this flag VIR_MIGRATE_PERSIST_DEST but still
> VM is
> > not persisting on Destination. Do I need to change something while
> creating
> > the VM?
> >
>
> That flag might not be implemented to xen. But in that case it should
> explicitly reject the flag. Please file a bug.
>
> But if you need a working solution, you can just do a lookupByName on the
> remote host after migration, then define that guest to make it persistent.
>
> - Cole
>
>
Ok. Before trying your solution one thing i want to ask. After migration I
can do lookupByName which returns a domain pointer and then I can get the
XML description of domain using getXMLDesc and then "can I still define the
domain using defineXML because it returns a newly created domain's
pointer?" and domain is already running in transient mode. I do not want to
shut off the domain after migration.

-- 
Tasvinder
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