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On 11/12/2015 07:41 AM, Saverio Proto wrote:
> So here is my best guess.
> Could be that I am missing this patch ?
>
> https://github.com/openstack/cinder/commit/6211d8fa2033c2a607c20667110c5913cf60dd53

Exactly, you need that patch for cinder to use rbd_default_features
from ceph.conf instead of its own default of only layering.

In infernalis and later version of ceph you can also add object map to
existing rbd images via the 'rbd feature enable' and 'rbd object-map
rebuild' commands.

Josh

> proto at controller:~$ apt-cache policy python-cinder
> python-cinder:
>    Installed: 1:2014.2.3-0ubuntu1.1~cloud0
>    Candidate: 1:2014.2.3-0ubuntu1.1~cloud0
>
>
> Thanks
>
> Saverio
>
>
>
> 2015-11-12 16:25 GMT+01:00 Saverio Proto <zioproto at gmail.com>:
>> Hello there,
>>
>> I am investigating why my cinder is slow deleting volumes.
>>
>> you might remember my email from few days ago with subject:
>> "cinder volume_clear=zero makes sense with rbd ?"
>>
>> so it comes out that volume_clear has nothing to do with the rbd driver.
>>
>> cinder was not guilty, it was really ceph rbd slow itself to delete big volumes.
>>
>> I was able to reproduce the slowness just using the rbd client.
>>
>> I was also able to fix the slowness just using the rbd client :)
>>
>> This is fixed in ceph hammer release, introducing a new feature.
>>
>> http://www.sebastien-han.fr/blog/2015/07/06/ceph-enable-the-object-map-feature/
>>
>> Enabling the object map feature rbd is now super fast to delete large volumes.
>>
>> However how I am in trouble with cinder. Looks like my cinder-api
>> (running juno here) ignores the changes in my ceph.conf file.
>>
>> cat cinder.conf | grep rbd
>>
>> volume_driver=cinder.volume.drivers.rbd.RBDDriver
>> rbd_user=cinder
>> rbd_max_clone_depth=5
>> rbd_ceph_conf=/etc/ceph/ceph.conf
>> rbd_flatten_volume_from_snapshot=False
>> rbd_pool=volumes
>> rbd_secret_uuid=secret
>>
>> But when I create a volume with cinder, The options in ceph.conf are ignored:
>>
>> cat /etc/ceph/ceph.conf | grep rbd
>> rbd default format = 2
>> rbd default features = 13
>>
>> But the volume:
>>
>> rbd image 'volume-78ca9968-77e8-4b68-9744-03b25b8068b1':
>>      size 102400 MB in 25600 objects
>>      order 22 (4096 kB objects)
>>      block_name_prefix: rbd_data.533f4356fe034
>>      format: 2
>>      features: layering
>>      flags:
>>
>>
>> so my first question is:
>>
>> does anyone use cinder with rbd driver and object map feature enabled
>> ? Does it work for anyone ?
>>
>> thank you
>>
>> Saverio
>
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