I'm surprised I couldn't find this explained anywhere (I did look), but ...

What is the pgmap and why does it get updated every few seconds on a tiny
cluster that's mostly idle?

I do know what a placement group (PG) is and that when documentation talks
about placement group maps, it is talking about something else -- mapping of
PGs to OSDs by CRUSH and OSD maps.

-- 
Bryan Henderson                                   San Jose, California
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