Hi all, IMHO reweight-by-utilization should come with some sort of warning, it just suddenly reweights everything - no dry run, no confirmation, apparently no option to see what it's going to do. It also doesn't appear to consider pools and hence crush rulesets, which I imagine could result in it making some poor reweighting decisions.
We ran it on a cluster this evening and promptly had over 70% of objects misplaced - even at 5-7 GB/s that's quite a lot of data movement when there are half a billion objects in the cluster! I think we'll stick with Dan's scripts (https://github.com/cernceph/ceph-scripts/blob/master/tools/crush-reweight-by-utilization.py) for the moment (thanks Dan!). -- Cheers, ~Blairo _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
