Htop is not the only tool for this . Cassandra will hit io bottlnecks before
cpu (on faster cpus) . A simple solution is to check the size of the data dir
on the boxes. If you have aprox the same size then cassandra is wrinting in the
whole cluster. Check how the data dir size changes when importing use iostat to
see how loaded the hdds are. In my experience I rarely look at cpu load. Since
i have hdds i/o is the thing that i keep an eye on. Also try secvential strings
when inserting but this should behave aprox the same as for random ones.<a
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