
iostat (input/output statistics) is a computer system monitor tool used to collect and show operating system storage input and output statistics. It is often used to identify performance issues with storage devices, including local disks, or remote disks accessed over network file systems such as NFS. It can also be used to provide information abo...
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http://en.wikipedia.org/wiki/Iostat

Display I/O statistics, see Section 4.3.5.4.
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http://www.tldp.org/LDP/intro-linux/html/gloss.html
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