These are known problem. Are you doing mkfs.xfs on SSD? If so, please check SSD data sheets whether UNMAP is supported. To avoid unmap during mkfs, use mkfs.xfs -K
Regards, Anand On Thu, Jul 7, 2016 at 5:23 PM, Nick Fisk <n...@fisk.me.uk> wrote: > Hi All, > > > > Does anybody else see a massive (ie 10x) performance impact when either > deleting a RBD or running something like mkfs.xfs against an existing RBD, > which would zero/discard all blocks? > > > > In the case of deleting a 4TB RBD, I’m seeing latency in some cases rise > up to 10s. > > > > It looks like it the XFS deletions on the OSD which are potentially > responsible for the massive drop in performance as I see random OSD’s in > turn peak to 100% utilisation. > > > > I’m not aware of any throttling than can be done to reduce this impact, > but would be interested to here from anyone else that may experience this. > > > > Nick > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- ---------------------------------------------------------------------------- Never say never.
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