When it comes Disk performance, DISK I/O plays an important role.
To Find out and Monitoring Linux Disk I/O:
Login into your server through ssh using putty, Just like TOP Command in Linux which used to monitor load on the server we have IOTOP command to monitor I/O of Disk.
You should get a list of running processes along with information about their current disk I/O usage.
The output will look something like this:
