Open Stack

It would.  I'd test though.  Depending on the amount of RAM and the I/O of
the underlying host, we saw that some larger instances could take longer
to suspend/resume than shutdown/power up.  You maintain the state of the
system, but may see longer "downtime" for the instance.  Something to
think about.

Thanks!
Matt

On 5/13/15 6:19 PM, "Favyen Bastani" <fbastani at perennate.com> wrote:

>Would a virsh suspend/save/restore/resume operation accomplish similar
>result as the localhost migration?
>
>Best,
>Favyen
>
>On 05/13/2015 12:44 PM, Matt Van Winkle wrote:
>> Yeah, something like that would be handy.
>> 
>> From: matt <matt at nycresistor.com<mailto:matt at nycresistor.com>>
>> Date: Wednesday, May 13, 2015 10:29 AM
>> To: "Daniel P. Berrange"
>><berrange at redhat.com<mailto:berrange at redhat.com>>
>> Cc: Matt Van Winkle
>><mvanwink at rackspace.com<mailto:mvanwink at rackspace.com>>,
>>"openstack-operators at lists.openstack.org<mailto:openstack-operators at lists
>>.openstack.org>" 
>><openstack-operators at lists.openstack.org<mailto:openstack-operators at lists
>>.openstack.org>>
>> Subject: Re: [Openstack-operators] Venom vulnerability
>> 
>> honestly that seems like a very useful feature to ask for...
>>specifically for upgrading qemu.
>> 
>> -matt
>> 
>> On Wed, May 13, 2015 at 11:19 AM, Daniel P. Berrange
>><berrange at redhat.com<mailto:berrange at redhat.com>> wrote:
>> On Wed, May 13, 2015 at 03:08:47PM +0000, Matt Van Winkle wrote:
>>> So far, your assessment is spot on from what we've seen.  A migration
>>> (if you have live migrate that's even better) should net the same
>>>result
>>> for QEMU.  Some have floated the idea of live migrate within the same
>>> host.  I don't know if nova out of the box would support such a thing.
>> 
>> Localhost migration (aka migration within the same host) is not
>>something
>> that is supported by libvirt/KVM. Various files QEMU has on disk are
>>based
>> on the VM name/uuid and you can't have 2 QEMU processes on the host
>>having
>> the files at the same time, which precludes localhost migration working.
>> 
>> Regards,
>> Daniel
>> 
>> 
>> 
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