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. 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
 |