[libvirt] KVM migration with uri = NULL
Daniel P. Berrange
berrange at redhat.com
Mon Apr 20 09:09:38 UTC 2009
On Sun, Apr 19, 2009 at 09:16:53AM +0200, Chris Lalancette wrote:
> Zvi Dubitzky wrote:
> > What is the meaning of using virDomainMigrate () with NULL uri.
> > Looking at the code of qemudDomainMigratePrepare2 ()/ qemu_driver.c, I
> > understand that it tries to perform a migration to another
> > VM on the same node . Is that correct ?
>
> No, that's not right. The URI parameter is generally not needed when you are
> doing a live migrate; it's basically there to specify an "alternate" way to
> reach the remote qemu process, but I've haven't come across a case where it is
> useful yet. That is, you *should* set URI to NULL, and let libvirt handle the
> details.
The time it is useful is if your machine has multiple NICs, you are using
one set of interfaces for management, and want migration to go over a
different interface that's perhaps more suited for low-latency/high-bandwidth
needs of migration. In this case you'd give a URI refering to the alternate
interface's IP address
Daniel
--
|: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :|
|: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
More information about the libvir-list
mailing list