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Understanding the /etc/fstab file
The 
/etc/fstab
 file is a very critical file on your Linux system. You can edit this file 
to call out additional volumes you would like to automatically mount at boot time. 
However, the main purpose of this file is to also mount your main filesystem, so if you 
make a mistake while editing it, your server will not boot. Definitely be careful here.
A useful trick when mounting devices is to execute the 
df –h
 
command before and after mounting.
While that command is generally used to check how much free 
space you have on various mounts, it does show you a list of 
mounted devices, so you can simply compare the results after 
mounting the device to confirm that it is present.

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Chapter 9