[Openstack-operators] Ceph backed 'boot from volume' downloading image

matt matt at nycresistor.com
Wed Jul 29 14:53:33 UTC 2015


Caius why not submit that patch to openstack review for cinder?  I'm sure
more than a few of us would be glad to voice our desire for it or something
much like it to land in liberty.

-Matt

On Wed, Jul 29, 2015 at 10:36 AM, Caius Howcroft <caius.howcroft at gmail.com>
wrote:

> Hi,
>
> We (bloomberg) are preparing to roll out kilo into production and one
> thing is causing a lot of grief. I wonder if anyone else has
> encountered it.
>
> We run BCPC (https://github.com/bloomberg/chef-bcpc) which is ceph
> backed. When we boot an instance from volume the cinder create volume
> from image function (
>
> https://github.com/openstack/cinder/blob/stable/kilo/cinder/volume/drivers/rbd.py#L850
> )
> ends up pulling the entire image through the glance API, so lots of
> tenants doing this creates quite a bit of load on our API nodes.
>
> We were confused why it did this, when its way more efficient to go
> directly via rbd clone, we created a patch and tested and it seems to
> work just fine (and an order of magnitude faster)
> https://github.com/bloomberg/chef-bcpc/pull/742
>
> So, the question is: what are other ceph backed installations doing ?
>
> Caius
>
>
> --
> Caius Howcroft
> @caiushowcroft
> http://www.linkedin.com/in/caius
>
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