OSD port usage

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Hi,

I noticed in the documentation that the OSD should use 3 ports per OSD
daemon running and so when I setup the cluster, I originally opened
enough port to accomodate this (with a small margin so that restart
could proceed even is ports aren't released immediately).

However today I just noticed that OSD daemons are using 5 ports and so
for some of them, a port or two were locked by the firewall.

All the OSD were still reporting as OK and the cluster didn't report
anything wrong but I was getting some weird behavior that could have
been related.


So is that usage of 5 TCP ports normal ? And if it is, could the doc
be updated ?


Cheers,

    Sylvain
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