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measuring iops

I am using, org.apache.hadoop.hbase.PerformanceEvaluation, for performance
evaluation and was wondering if there is a way to get iops for the entire
test(s). Or, is there a particular test which will determine this metric
for me. The goal is to see how many extra I/O operations each node delivers
for me, so currently I have a 3 node cluster and once I add 4 nodes how
many more operations can be constructed?

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