Can someone please explain to me the difference between the Global "AVAIL" and 
the "MAX AVAIL" in the pools table when I do a "ceph df detail"?  The reason 
being that we have a total of 14 pools, however almost all of our data exists 
in one pool.  A "ceph df detail" shows the following:

GLOBAL:
    SIZE       AVAIL     RAW USED     %RAW USED     OBJECTS
    28219G     6840G       19945G         70.68      36112k

But the POOLS table from the same output shows the MAX AVAIL for each pool as 
498G and the pool with all the data shows 9472G used with a %USED of 95.00.  If 
it matters, the pool size is set to 2 so my guess is the global available 
figure is raw, meaning I should still have approx. 3.4TB available, but that 
95% used has me concerned.  I'm going to be adding some OSDs soon but still 
would like to understand the difference and how much trouble I'm in at this 
point.


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