This tool lets you monitor I/O latency in real time. It shows disk latency in the same way as ping shows network latency.

Login to SSH.

Go to the folder where you want to download it.

cd /usr/local/src

Download the installation file.

https://ioping.googlecode.com/files/ioping-0.6.tar.gz

Extract that file using below command.

tar -xzvf ioping-0.6.tar.gz

Go inside that folder.

cd ioping-0.6

compile it using below command.

make ioping