Might be a silly question, but did you run "nodetool upgradesstables" and
convert to the 3.0 format?  Also, which 3.0?  Newest, or an earlier 3.0.x?

On Fri, Aug 10, 2018 at 3:05 PM, kooljava2 <koolja...@yahoo.com.invalid>

> Hello,
> We recently upgrade C* from 2.1 to 3.0. After the upgrade we are seeing
> increase in the  total read bytes and read ops on the EBS volumes. It
> almost doubled on all the nodes.  The number of writes are same.
> Thank you.

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