Here on the Percona Support team we often ask customers to retrieve disk stats to monitor disk IO and to measure block devices iops and latency. There are a number of tools available to monitor IO on Linux. iostat is one of the popular tools and Percona Toolkit, which is free, contains the pt-diskstats tool [&]

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http://www.percona.com/blog/2014/09/04/mysql-101-monitor-disk-io-with-pt-diskstats/