Open Stack

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/