Suggestion: flag HEALTH_WARN state if monmap has 2 mons

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Hi everyone,

I wonder what others think about the following suggestion: running an
even number of mons almost never makes sense, and specifically two
mons never does at all. Wouldn't it make sense to just flag a
HEALTH_WARN state if the monmap contained an even number of mons, or
maybe only if the number of mons in the monmap is exactly 2?

Documentation on why this is a bad idea does exist and is actually
just as comprehensive as it needs to be
(http://docs.ceph.com/docs/master/rados/operations/add-or-rm-mons/),
but it still seems to me that this is a very common rookie mistake.

Thoughts?

Cheers,
Florian
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