`ceph osd down` only marks the OSD down in the CRUSH map. It does not affect daemons. When OSDs are operating properly they’ll mark themselves back up. This is occasionally useful to kick stuck peering etc.
The question of how to remove/replace an OSD depends on how they’re deployed. > On Nov 7, 2022, at 3:20 AM, Rainer Krienke <krie...@uni-koblenz.de> wrote: > > Hi, > > today morning I had osd.77 in my ceph nautilus cluster with 144 OSDs on 9 > hosts that seemed to not be working correctly , it caused slow ops: > > ceph -s > cluster: > id: 7397a0cf-bfc6-4d25-aabb-be9f6564a13b > health: HEALTH_WARN > Reduced data availability: 6 pgs inactive, 8 pgs peering > 62 slow ops, oldest one blocked for 2703 sec, osd.77 has slow ops > > Bevore I had installed ubuntu security updates and then rebooted the host > with osd.77. Already before rebooting I saw some read errors on the console, > so probably the disk of osd.77 is dying. I had a similar cluster behaviour > some months ago where also an osd had slow ops and half a day later it died > so I could replace the disk. > > With this history I now wanted to take osd.77 down and out of the cluster to > replace the disk. Now I was unsure about how to do this. I thought, this > should be corect: > > # osd down 77 > # osd out 77 > # osd destroy 77 > > Would this be in general the right way to prepare a disk replacement? > > Now strange but good things happened after the: "ceph osd down 77". There was > no error running this command, but then "ceph -s" showed still all osds up > and in. I had expected that one OSD should be down now, but it wasn't. > And even more strange the problems with slow ops from osd.77 are also gone > for the moment and the cluster is completely healthy again. > > Thanks for your help > Rainer > -- > Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1 > 56070 Koblenz, Tel: +49261287 1312 Fax +49261287 100 1312 > Web: http://userpages.uni-koblenz.de/~krienke > PGP: http://userpages.uni-koblenz.de/~krienke/mypgp.html > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
