Significantly higher Read IO usage after upgrade from 10.7 to 10.11

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Significantly higher Read IO usage after upgrade from 10.7 to 10.11

S Bob
All;


After a minor version upgrade from 10.7 to 10.11 we are now seeing
almost double the IO usage for reads, our traffic has increased slightly
but not nearly enough to justify double the read IO usage.

Any known issues that could explain this?


Thanks in advance