monitor start up question

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When a cluster has been shut down and then re-started, how do the
monitors know what the cluster fsid is?  Is it stored somewhere?

I would like to be able to verify, before starting a monitor on a
given server, if an existing monitor directory belongs to the current
cluster or to a previous cluster incarnation.  With the OSDs, I can
just check the cluster_fsid file.

Regards,
Mandell Degerness
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