I found a partial answer to some of the questions:
5./ My questions:
- Is there a simple command for me to check which sessions are
active? 'cephfs-table-tool 0 show session' does not seem to work
- Is there a way for me to cross check which sessions belong to
which clients (IPs)?
'ceph daemon mds.a session ls' should give you delails about the state
of sessions, and the mapping to clients.
- Is there a way for me to understand / debug what is happening
with a particular session? In this case, I would be interested in
understanding which CLIENT5 was closed...
- Is there a way to reestablish a session without having to
restart the mds?
Still trying to understand more on that.
Cheers
G.
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