Thanks! I was in the process of upgrading, so "noout" was already set, probably preventing setting "noin". I thus just "ceph osdset noup", then "ceph osd down <ids>", which stopped activity on the disks (probably not enough to clean everything in Bluestore, but I decided to trust its inner working). I now have an unbootable XFS root filesystem, some OSDs out but probably OK owith their data, and 4× redundancy. I'll pause and think about the next steps with no urgency ;-) Le vendredi 21 septembre 2018 à 11:09 +0200, Patrick Nawracay a écrit : > Hi, > > you'll need to set `noup` to prevent OSDs from being started > automatically. The `noin` flags prevents that the cluster sets the > OSD > `in` again, after it has been set `out`. > > `ceph osd set noup` before `ceph osd down <id>` > > `ceph osd set noin` before `ceph osd out <id>` > > Those global flags (they prevent all OSDs from being automatically > set > up/in again), can be disabled with unset. > > `ceph osd unset <noup|noin>` > > Please note that I'm not familiar with recovery of a Ceph cluster, > I'm > just trying to answer the question, but don't know if that's the best > approach in this case. > > Patrick > > > On 21.09.2018 10:49, Nicolas Huillard wrote: > > Hi all, > > > > One of my server crashed its root filesystem, ie. the currently > > open > > shell just says "command not found" for any basic command (ls, df, > > mount, dmesg, etc.) > > ACPI soft power-off won't work because it needs scripts on /... > > > > Before I reset the hardware, I'd like to cleanly stop the OSDs on > > this > > server (with still work because they do not need /). > > I was able to move the MGR out of that server with "ceph mgr fail > > [hostname]". > > Is it possible to tell the OSD on that host to stop, from another > > host? > > I tried "ceph osd down [osdnumber]", but the OSD just got back "in" > > immediately. > > > > Ceph 12.2.7 on Debian > > > > TIA, > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Nicolas Huillard Associé fondateur - Directeur Technique - Dolomède nhuillard@xxxxxxxxxxx Fixe : +33 9 52 31 06 10 Mobile : +33 6 50 27 69 08 http://www.dolomede.fr/ https://www.observatoire-climat-energie.fr/ https://reseauactionclimat.org/planetman/ https://350.org/fr/ https://reporterre.net/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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