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Iotop is a simple tool for Unix systems that allows you to monitor the use of any flash / hdd / ssd storage device in real time. The most important information provided by the application is the instantaneous read and write speed, the amount of written and read data and the name of the process.

To install it in the Debian system in the console we issue the command:

apt-get install iotop

In the CentOS system

yum install iotop

We start the program by command:

iotop

Iotop works in the interactive mode by default, which allows you to use hotkeys to control the work of the program.

Here is a list of some keyboard shortcuts:
a - switches between "momentary" and "long-term" view (current read / write speed, or total amount of data transferred for the session)
p - showing only active processes at the moment
q - exit from the program