In my side, I saw the osd container trying to map and start on another "device
mapper" that in "READ-ONLY". You could check by
Step 1: check the folder store OSD infomation
the path is /var/lib/ceph/{fsid}/osd.{id}/block , when we run `ls -lah {block}`
, we will get a symlink like that
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I've met this issue when try to upgrade octopus 15.2.17 to 16.2.13 last night.
Upgrade process failed at mgr module phase after the new MGR version become to
active state. I tried to enable debug `ceph config set mgr
mgr/cephadm/log_to_cluster_level debug
` and I saw the message like @xadhoom76
