Simple Math?

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I?m trying to figure if its possible to compute how many nodes I can lose.  I?ve got a cluster of 6 boxes with 9 disks each for a total of 54 OSD?s.   There are a total of 1800 placement groups on those OSD?s.  The replica size is 3.

Is there a way to figure it out or is more information needed?

Thanks!
Josh Zojonc
Oregon State Univeristy
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