Open Stack

+1 for this being in Nova.

Who holds the trigger for removing a shelved instance from the
hypervisor may eventually be in the hands of an uber-conductor outside
of Nova, but clearly will still need all this plumbing in Nova to make
the feature work. We probably need an admin API to trigger the
offloading of the shelved server before the timer goes anyway.

John

On 25 June 2013 20:19, Russell Bryant <rbryant at redhat.com> wrote:
> On 06/25/2013 02:12 PM, Vishvananda Ishaya wrote:
>>
>> On Jun 25, 2013, at 10:38 AM, Andrew Laski <andrew.laski at rackspace.com> wrote:
>>
>>> <snip>
>>>
>>> You're correct that there's not a large benefit to a deployer unless resources are reclaimed.  Perhaps some small power savings, and the freedom to migrate the instance transparently if desired.  I would prefer to remove the instance when it's shelved rather than waiting for something, like a periodic task or admin api call, to trigger it.  But booting disk based images can take a fairly long time so I've optimized for the case of an instance being shelved for a day or a weekend.  That way users get acceptable unshelve times for the expected case, and deployers benefit when an instance is shelved longer term.  I don't think this needs to be set in stone and the internal working can be modified as we find ways to improve it.
>>
>> We had a lively discussion at the summit about this feature:
>>
>> https://etherpad.openstack.org/HavanaMothballServer
>>
>> The entire value proposition of this feature is that resources are the same on unshelve. I don't see any way to do this outside of nova. Also, it bears mentioning there is room for optimization on the unshelve using something similar to live-snapshotting [1].
>>
>> Vish
>>
>> [1] https://review.openstack.org/#/c/33698/
>
> FWIW, totally agreed that this has to be in nova.
>
> --
> Russell Bryant
>
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