On Mon, Aug 20, 2018 at 10:19 PM Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote: > > > Am 20.08.2018 um 21:52 schrieb Sage Weil: > > On Mon, 20 Aug 2018, Stefan Priebe - Profihost AG wrote: > >> Hello, > >> > >> since loic seems to have left ceph development and his wunderful crush > >> optimization tool isn'T working anymore i'm trying to get a good > >> distribution with the ceph balancer. > >> > >> Sadly it does not work as good as i want. > >> > >> # ceph osd df | sort -k8 > >> > >> show 75 to 83% Usage which is 8% difference which is too much for me. > >> I'm optimization by bytes. > >> > >> # ceph balancer eval > >> current cluster score 0.005420 (lower is better) > >> > >> # ceph balancer eval $OPT_NAME > >> plan spriebe_2018-08-20_19:36 final score 0.005456 (lower is better) > >> > >> I'm unable to optimize further ;-( Is there any chance to optimize > >> further even in case of more rebelancing? > > > > The scoring that the balancer module is doing is currently a hybrid of pg > > count, bytes, and object count. Picking a single metric might help a bit > > (as those 3 things are not always perfectly aligned). > > Hi, > > ok i found a bug in the balancer code which seems to be present in all > releases. > > 861 best_ws = next_ws > 862 best_ow = next_ow > > > should be: > > 861 best_ws = copy.deepcopy(next_ws) > 862 best_ow = copy.deepcopy(next_ow) > > otherwise it does not use the best but the last. Interesting... does that change improve things? Also, if most of your data is in one pool you can try ceph balancer eval <pool-name> -- dan > > I'm also using this one: > https://github.com/ceph/ceph/pull/20665/commits/c161a74ad6cf006cd9b33b40fd7705b67c170615 > > to optimize by bytes only. > > Greets, > Stefan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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