iotop tool.

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If you want to monitor the disk read and write speed real-time you can use the iotop tool.

This is useful to get exact information about how a disk performs for a particular application or task. The output will show you read/write speed per process, and total read/write speed for the server, much similar to top.

To install iotop:

sudo apt-get install iotop  

To run it:

sudo iotop