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.
- 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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