Sometimes your disk usage does not add up - for example:
karl@someserver:~$ df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 52G 49G 243M 100% /
So what gives? 49Gb + 248Mb is definitely less than 52Gb !! This is a sizeable discrepancy of at least 1.5 …
Let us assume you already figured out where your disk space went.
Cleaning up disk space is easy: You just delete stuf, right?
Well.. Mostly. There are a couple of things to watch out for:
Imagine the scenario: Your application does not work, and no errors are appearing in your log files. In fact: nothing new is appearing in your log files! Bah!
And then you discover that your root file system is full. And that's the only file system on the box:
Filesystem 1K-blocks …