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I've read that in Unix, you can configure the file-system to reserve certain amount of space for root. Which configuration property is it?

marked as duplicate by cuonglm, jasonwryan, maxschlepzig, Braiam, derobert Aug 2 '14 at 20:56

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If you meant /root as the directory then, you would need to create a new partition on the hard drive with fdisk or parted and assign it to be mounted as /root in either during install process or manually in /etc/fstab file. This way the mount point /root will be consuming just that partition.

along this how to will suffice. https://askubuntu.com/questions/154180/how-to-mount-a-new-drive-on-startup

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