There are three factors that impact disk utilization of an OSD: 1. number of PGs on the OSD (determined by CRUSH) 2. number of objects with each PG (better to pick a 2 power PG number to make this one more even) 3. object size deviation
with 'ceph osd reweight-by-pg', you can tune (1). And if you would like to get a better understanding of what is the root cause in your cluster, you can find more information from 'pg dump', from where you can get the raw data for 1 and 2. Once the cluster is filled, you properly go with 'ceph osd reweight-by-utilization', be careful of that since it could incur lots of data movement... ---------------------------------------- > To: ceph-users@lists.ceph.com > From: vedran.fu...@gmail.com > Date: Fri, 14 Aug 2015 00:15:17 +0200 > Subject: Re: [ceph-users] OSD space imbalance > > On 13.08.2015 18:01, GuangYang wrote: >> Try 'ceph osd <int>' right after creating the pools? > > Would it do any good now when pool is in use and nearly full as I can't > re-create it now. Also, what's the integer argument in the command > above? I failed to find proper explanation in the docs. Please check it out here - https://github.com/ceph/ceph/blob/master/src/mon/OSDMonitor.cc#L469 > >> What is the typical object size in the cluster? > > Around 50 MB. > > > Thanks, > Vedran > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
