Monitor disk i/o in linux

Wondering how much disk i/o is taking place on my linux server (Ubuntu). I decided it was time to install some tools to help me out.

Here is what i am using:

iostat makes a snapshot of each available physical volume, and shows the current reads and writes of the volumes.

dstat is a more advanced, and measures both disk i/o as well as network i/o in near real-time.
sample command:  dstat -dnyc -f 5

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