Open Stack

ahh thank you, we will dig through our config again and see of
something isn't right.

On Wed, Jul 29, 2015 at 2:31 PM, Josh Durgin <jdurgin at redhat.com> wrote:
> Hi Caius,
>
> This has existed in the rbd cinder driver since volume-to-image was added:
>
> https://github.com/openstack/cinder/blob/stable/kilo/cinder/volume/drivers/rbd.py#L823
>
> Cinder falls back to doing the full copy if glance doesn't report the
> location, or it's not marked as raw format.
>
> If glance doesn't have show_image_direct_url = True, or cinder doesn't
> have glance_api_version = 2, cinder won't be able to do the clone. See
>
> http://ceph.com/docs/master/rbd/rbd-openstack/#configure-openstack-to-use-ceph
>
> for more details.
>
> Josh
>
>
> On 07/29/2015 07:36 AM, Caius Howcroft 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 Howcroft
@caiushowcroft
http://www.linkedin.com/in/caius