Being a Linux sys admin. one of the main task is monitoring our Linux servers. Continually. We need to keep on checking the CPU usage, I/O, NIC, Memory etc. These are command you had learned in your RHCE Training and RHCSS Training also.
We can use different tools like vmstat, iostat, ifstat to get that information.
But you can also use a very versatile Linux command – dstat.
As per dstat man pages and website –
Dstat allows you to view all of your system resources instantly, you can eg. compare disk usage in combination with interrupts from your IDE controller, or compare the network bandwidth numbers directly with the disk throughput (in the same interval).
Dstat also cleverly gives you the most detailed information in columns and clearly indicates in what magnitude and unit the output is displayed. Less confusion, less mistakes, more efficient.
Dstat is unique in letting you aggregate block device throughput for a certain diskset or network bandwidth for a group of interfaces, ie. you can see the throughput for all the block devices that make up a single filesystem or storage system.
Dstat allows its data to be directly written to a CSV file to be imported and used by OpenOffice, Gnumeric or Excel to create graphs.
Here is a small dstat illustration from my machine.