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==Mounting / Un-mounting File-Systems==
[[Image:mount.png|thumb|700px|right|Using the '''mount''' command with no arguments displays file-systems that are already mounted. The Linux system administrator can use the '''mount''' and '''umount''' commands to connect and disconnect different partitions from the file-system to perform maintenance.]]
We take for granted that a file-system must be mounted (for example the root partition) in order for a Linux system to be usable upon system start-up. We need to learn now to do this manually by editing or adding an entry in the ''/etc/fstab'' file. The '''/etc/fstab''' (file system table) contains entries to mount various file systems automatically upon start-up of the Linux system.
The Linux system administrator also has the ability to manually '''mount''' (connect) and '''un-mount''' (disconnect) partitions in order to perform maintenance on the file system (for example un-mounting the '''/home''' partition to install software and prevent users from logging in during that process). Those command are called: '''mount''' and '''umount''' (that is NOT a typo)!
==Monitoring File System Space==
[[Image:disk_usage.png|thumb|500px|right|The '''df''' and '''du''' commands are useful tools for Linux system administrators to flag disk space issues and investigate their causes.]]
Another essential duty of a Linux system administrator is to anticipate problems and take preventative measures to avoid computer system problems <u>before</u> that occur.
Monitoring disk space activity helps provide Linux system administrators information to help take corrective action before problems can occur.
If we need more space, then we can use LVM to help us out!
== Common Mistakes / Warnings ==
{{Admon/important |Be Aware of the Following Issues| Be aware of these common mistakes that students make that can cause problems for their future labs.}}