Quoting Sean Matheny (s.matheny@xxxxxxxxxxxxxx): > I tested this out by setting norebalance and norecover, moving the host buckets under the rack buckets (all of them), and then unsetting. Ceph starts melting down with escalating slow requests, even with backfill and recovery parameters set to throttle. I moved the host buckets back to the default root bucket, and things mostly came right, but I still had some inactive / unknown pgs that I had to restart some OSDs to get back to health_ok. > > I’m sure there’s a way you can tune things or fade in crush weights or something, but I’m happy just moving one at a time. For big changes like this you can use Dan's UPMAP trick: https://www.slideshare.net/Inktank_Ceph/ceph-day-berlin-mastering-ceph-operations-upmap-and-the-mgr-balancer Python script: https://github.com/cernceph/ceph-scripts/blob/master/tools/upmap/upmap-remapped.py This way you can pause the process or get in "HEALTH_OK" state when you want to. Gr. Stefan -- | BIT BV https://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / info@xxxxxx _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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