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Measuring disk IO stats using iostat

• Change your locale to english: export LC_ALL=en_US.utf8
• Start iostat and log the result: S_TIME_FORMAT=ISO nohup iostat -x -c 2 -t -m > iostat.log &
• Get the resulting file, and use https://nmonvisualizer.github.io/nmonvisualizer/index.html to visualise.