2018-06-13 23:53 GMT+02:00 <c...@elchaka.de>:

> Hi yao,
>
> IIRC there is a *sleep* Option which is usefull when delete Operation is
> being done from ceph.... sleep_trim or something like that.
>

you are thinking of "osd_snap_trim_sleep" which is indeed a very helpful
option - but not for deletions.
It rate limites snapshot deletion only.

Paul


>
> - Mehmet
>
> Am 7. Juni 2018 04:11:11 MESZ schrieb Yao Guotao <yaoguo_...@163.com>:
>>
>> Hi Jason,
>>
>> Thank you very much for your reply.
>> I think the RBD trash is a good way. But, the QoS in Ceph is a better
>> solution.
>> I am looking forward to the backend QoS of Ceph.
>>
>> Thanks.
>>
>>
>> At 2018-06-06 21:53:23, "Jason Dillaman" <jdill...@redhat.com> wrote:
>> >The 'rbd_concurrent_management_ops' setting controls how many
>> >concurrent, in-flight RADOS object delete operations are possible per
>> >image removal. The default is only 10, so given ten 10 images being
>> >deleted concurrently, I am actually surprised that blocked all IO from
>> >your VMs.
>> >
>> >Adding support for limiting the maximum number of concurrent image
>> >deletions would definitely be an OpenStack enhancement. There is an
>> >open blueprint for optionally utilizing the RBD trash instead of
>> >having Cinder delete the images [1], which would allow you to defer
>> >deletions to whenever is convenient. Additionally, once Ceph adds
>> >support for backend QoS (fingers crossed in Nautilus), we can change
>> >librbd to flag all IO for maintenance activities to background (best
>> >effort) priority, which might be the best long-term solution.
>> >
>> >[1] 
>> >https://blueprints.launchpad.net/cinder/+spec/rbd-deferred-volume-deletion
>> >
>> >On Wed, Jun 6, 2018 at 6:40 AM, Yao Guotao <yaoguo_...@163.com> wrote:
>> >> Hi Cephers,
>> >>
>> >> We use Ceph with Openstack by librbd library.
>> >>
>> >> Last week, my colleague delete 10 volumes from Openstack dashboard at the
>> >> same time, each volume has about 1T used.
>> >> During this time, the disk of OSDs are busy, and there have no I/O for
>> >> normal vm.
>> >>
>> >> So, I want to konw if there are any parameters that can be set to 
>> >> throttle?
>> >>
>> >> I find a parameter about rbd op is 'rbd_concurrent_management_ops'.
>> >> I am trying to figure out how it works in code, and I find the parameter 
>> >> can
>> >> only control the asyncchronous deletion of all objects of an image.
>> >>
>> >> Besides, Should it be controlled at Openstack Nova or Cinder layer?
>> >>
>> >> Thanks,
>> >> Yao Guotao
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> ceph-users mailing list
>> >> ceph-users@lists.ceph.com
>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >>
>> >
>> >
>> >
>> >--
>> >Jason
>>
>>
>>
>>
>>
>
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>


-- 
Paul Emmerich

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