There are many different tools that can be used to help us measure disk i/o - although for this post I will be looking at two specific tools that both have their merits.
iotop (yum install iotop)
iotop is a real-time command line utility used to measure i/o performance for specific processes and has a similar interface to that of top.
iostat (yum install sysstat)
iostat comes as part of the sysstat package and is a great tool to check i/o against a specific disk for example:
iostat -x 2
The above command displays the disk i/o stats in 2 second intervals.
The %iowait variable is the time the system is waiting on the disk.
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