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, > -- SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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