Ended up in the weeds on this topic in a hurry....
http://www.r71.nl/index.php?option=com_content&view=article&catid=7:technical-docs&id=185:disk-queue-length-vs-disk-latency-times-which-is-best-for-measuring-database-performance&Itemid=50
http://www.pythian.com/blog/basic-io-monitoring-on-linux/
http://blog.jcole.us/2007/05/08/on-iostat-disk-latency-iohist-onward/
http://dom.as/2009/03/11/iostat/
http://www.admin-magazine.com/HPC/Articles/Monitoring-Storage-with-iostat
https://www.igvita.com/2009/06/23/measuring-optimizing-io-performance/
http://linux.die.net/man/1/iostat
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