Re: openstack -- does it use "copy-on-write"?

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Which version of OpenStack are you using?

When you launch your image are you using "Boot from image" or "Boot 
from image (creates a new volume)"
The former copies the image out of glance onto the local storage.  The 
latter should be copy-on-write using ceph rbd.

On Wed 08 Jan 2014 02:08:08 PM EST, Gautam Saxena wrote:
> When booting an image from Openstack in which CEPH is the back-end for
> both volumes and images, I'm noticing that it takes about ~10 minutes
> during the "spawning" phase -- I believe Openstack is making a fully
> copy of the 30 GB Windows image. Shouldn't it be a "copy-on-write"
> image and therefore take only a few seconds to spawn? (The other
> reason I think it's copying the whole 30 GB is that I monitored ceph
> using "ceph -w" and I saw the data volume size increase.)
>
> I've configured OpenStack to use CEPH. (It's virtually identical to
> the documentation, except that the glance api is version 1.0 and I've
> not configured CEPH backup service.)
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