My system is ubuntu. I want to find out what uses my disk. In fact, I want to see not exactly what uses it, but which parts of it are used. Which files are written and read.
I am building home server, and I don't want disk inside to spin all the time. Unfortunately I don't have "boot from USB" option, so I can't move whole system to USB. So I want to move part of it. Most often used part. For sure /var/log, but what else?
Is there any tool which can tell me what directories/files on my disk were used during let's say last 5 minutes? To know what is using them would be also nice.