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