I only run 6 OSDs on 3 nodes - so maybe not enough OSDs?
size=2:
When you write to just three OSDs, each one replicates to another OSD, a
total of 6 OSD writes.
Each OSD gets one write, the client only sees the bandwidth of the three
it wrote to.
size=3:
When you write to only three OSDs, each one replicates to two more OSDs,
a total of 9 OSD writes.
Half of the OSDs make two writes, I would expect reduced performance
with 50% of the OSDs doing twice the work.
I suspect if you added three more OSDs then size=3 would perform at
100MB/sec and size=2 would be faster than 100MB/sec.
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