Do I have enough pgs?

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Hi all,

I have a cluster of 3 nodes, 18 OSDs.  I used the pgcalc to give a suggested number of PGs - here was my list:

Group1   3 rep  18 OSDs  30% data  512PGs
Group2   3 rep  18 OSDs  30% data  512PGs
Group3   3 rep  18 OSDs  30% data  512PGs
Group4   2 rep  18 OSDs  5% data  256PGs
Group5   2 rep  18 OSDs  5% data  256PGs

My estimated growth is to 27-36 OSDs within the next 18 months, after that probably pretty stagnant for the next several years.

Thoughts?

-Tony
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