I had a weird thing happen when I was testing an upgrade in a dev environment where I have removed an MDS from a machine a while back.
I upgraded to 0.94.6 and low and behold the mds daemon started up on the machine again. I know the /var/lib/ceph/mds folder was removed becaues I renamed it /var/lib/ceph/mds-removed and I definitely have restarted this machine several times with mds not starting before.
Only thing I noticed was the auth keys were still in play. I am assuming the upgrade recreated the folder and found it still had access so it started back up.
I am guessing we have to add one more step in the removal mds from this post
1 Stop the old MDS
2 Run "ceph mds fail 0"
3 Run "ceph auth del mds.<name>"
I am a little weary of command 2 since there is no clear depiction of what 0 is. Is this command better since it is more clear "ceph mds rm 0 mds.<name>"
Is there anything else that could possibly resurrect it?
Best,
Scott
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