Hi Everyone,
I have a CephFS cluster that has MDS stuck in read only mode, and I do not know
what can be done to return the cluster into the writable mode:
health: HEALTH_WARN
1 MDSs are read only
1 MDSs behind on trimming
How I got there: we have an FS where we store data in EC pool. We have one
subdirectory that contains a lot of transitory data (constant
write/read/delete). I wanted to put this subdirectory (let's call it /temp)
into a separate replicated pool.
I did: created replicated pool, added it to the FS, switched /temp to that
replicated pool.
All worked for about 24 hours and then became obvious it was not a good idea,
so I reversed all steps: switched /temp to the original EC pool, removed
replicated pool from FS, deleted the replicated pool.
That is when MDS went into read only state. I can see inodes that were created
in /temp when it belonged to the replicated pool.
I tried many different things that I found in documentation, nothing works.
What should I do in order for the FS become writable again?
Thank you, --Max
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