[libvirt-users] using transport protocol in live migration

[digvijay chauhan]

Thanx.

On Mon, Apr 15, 2013 at 8:01 PM, Eric Blake <eblake at redhat.com> wrote:

> On 04/12/2013 07:28 AM, digvijay chauhan wrote:
> > Hello,
> >         I am working on live migration of virtual machine using xen and
> > kvm.If i use qemu+ssh:///system then is the transport protocol used
> during
> > live migration tcp or ssh?I mean i want to evaluate the performance of
> > transport protocil during live migration using wireshark and netperf
> > tool,so using this command will show tcp performance?
> >
> > Orelse i will have to use qemu+tcp:/// ?
>
> I'd start by reading and understanding this page:
> http://libvirt.org/migration.html
>
> If you do native migration, then it uses whatever protocol the native
> hypervisor uses (qemu only supports direct tcp), through a separate
> port.  If you use tunnelled migration, then the migration is multiplexed
> onto libvirt's connection (no additional open port required), and the
> transport then depends on however you connected to libvirt (whether it
> is straight TCP or whether it is using SSH depends on the URI of how you
> connected).  Tunnelled migration is inherently slower, since there are
> more copies involved - qemu -> libvirtd source -> libvirtd destination
> -> qemu; compared to native migration of qemu -> qemu.  But it also
> provides the possibility of SSH or TLS encryption, if you don't want
> migration going across the wire unencrypted (since qemu does not yet
> support encrypted migration natively).
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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