Hi everyone,

I use Ceph Firefly release.

I had a MDS cluster with only one MDS until yesterday, when I tried to add
a second one to test multi-mds. I thought I could get back to one MDS when
I want, but it seems we can't !

Both crashed this night, and I am unable to get them back today.

They appear as active in ceph -s, clients using 3.16 kernel mount it but no
operation can be done : "ls" is freezing, load average of client is
climbing and nothing is done by MDSes (not using CPU, nothing in logs
except some "mdsload" messages and after some time : closing stale session
client).

How can I do to debug this situation and recover my data ?

Thank you a lot.
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