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). s
