You should be able to create issues now; we had a misconfiguration in the tracker following the recent spam attack. -Greg On Tue, Aug 21, 2018 at 3:07 AM, Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote: > > Am 21.08.2018 um 12:03 schrieb Stefan Priebe - Profihost AG: >> >> Am 21.08.2018 um 11:56 schrieb Dan van der Ster: >>> On Tue, Aug 21, 2018 at 11:54 AM Stefan Priebe - Profihost AG >>> <s.priebe@xxxxxxxxxxxx> wrote: >>>> >>>> Am 21.08.2018 um 11:47 schrieb Dan van der Ster: >>>>> On Mon, Aug 20, 2018 at 10:45 PM Stefan Priebe - Profihost AG >>>>> <s.priebe@xxxxxxxxxxxx> wrote: >>>>>> >>>>>> >>>>>> Am 20.08.2018 um 22:38 schrieb Dan van der Ster: >>>>>>> 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? >>>>>> >>>>>> It fixes the following (mgr debug output): >>>>>> 2018-08-20 22:33:46.078525 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001180, misplacing 0.000912 >>>>>> 2018-08-20 22:33:46.078574 7f2fbc3b6700 0 mgr[balancer] Score got >>>>>> worse, taking another step >>>>>> 2018-08-20 22:33:46.078770 7f2fbc3b6700 0 mgr[balancer] Balancing root >>>>>> default (pools ['cephstor2']) by bytes >>>>>> 2018-08-20 22:33:46.156326 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001180, misplacing 0.000912 >>>>>> 2018-08-20 22:33:46.156374 7f2fbc3b6700 0 mgr[balancer] Score got >>>>>> worse, taking another step >>>>>> 2018-08-20 22:33:46.156581 7f2fbc3b6700 0 mgr[balancer] Balancing root >>>>>> default (pools ['cephstor2']) by bytes >>>>>> 2018-08-20 22:33:46.233818 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001180, misplacing 0.000912 >>>>>> 2018-08-20 22:33:46.233868 7f2fbc3b6700 0 mgr[balancer] Score got >>>>>> worse, taking another step >>>>>> 2018-08-20 22:33:46.234043 7f2fbc3b6700 0 mgr[balancer] Balancing root >>>>>> default (pools ['cephstor2']) by bytes >>>>>> 2018-08-20 22:33:46.313212 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001180, misplacing 0.000912 >>>>>> 2018-08-20 22:33:46.313714 7f2fbc3b6700 0 mgr[balancer] Score got >>>>>> worse, trying smaller step 0.000244 >>>>>> 2018-08-20 22:33:46.313887 7f2fbc3b6700 0 mgr[balancer] Balancing root >>>>>> default (pools ['cephstor2']) by bytes >>>>>> 2018-08-20 22:33:46.391586 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001152, misplacing 0.001141 >>>>>> 2018-08-20 22:33:46.393374 7f2fbc3b6700 0 mgr[balancer] Balancing root >>>>>> default (pools ['cephstor2']) by bytes >>>>>> 2018-08-20 22:33:46.473956 7f2fbc3b6700 0 mgr[balancer] Step result >>>>>> score 0.001152 -> 0.001180, misplacing 0.000912 >>>>>> 2018-08-20 22:33:46.474001 7f2fbc3b6700 0 mgr[balancer] Score got >>>>>> worse, taking another step >>>>>> 2018-08-20 22:33:46.474046 7f2fbc3b6700 0 mgr[balancer] Success, score >>>>>> 0.001155 -> 0.001152 >>>>>> >>>>>> BUT: >>>>>> # ceph balancer eval myplan >>>>>> plan myplan final score 0.001180 (lower is better) >>>>>> >>>>>> So the final plan does NOT contain the expected optimization. The >>>>>> deepcopy fixes it. >>>>>> >>>>>> After: >>>>>> # ceph balancer eval myplan >>>>>> plan myplan final score 0.001152 (lower is better) >>>>>> >>>>> >>>>> OK that looks like a bug. Did you create a tracker or PR? >>>> >>>> No not yet. Should i create a PR on github with the fix? >>> >>> Yeah, probably tracker first (requesting luminous,mimic backports), >>> then a PR on master with "Fixes: tracker..." >> >> Will do but can't find a create button in the tracker. I've opened >> several reports in the past but right now it seems a can't create a ticket. > > > http://tracker.ceph.com/projects/ceph/issues/new > > => > > 403 > You are not authorized to access this page. > > > > >> Stefan >> >>> >>> -- dan >>> >>> >>>> >>>>> -- Dan >>>>> >>>>> >>>>>>> >>>>>>> Also, if most of your data is in one pool you can try ceph balancer >>>>>>> eval <pool-name> >>>>>> >>>>>> Already tried this doesn't help much. >>>>>> >>>>>> Greets, >>>>>> Stefan >>>>>> >>>>>> >>>>>>> -- 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
