Monitoring Storage

Understanding how much disk space is used is critical for system health.

df reports on the filesystem usage (how much space is used on entire partitions/mounts).

Human Readable Output (-h):

bash $ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 39G 7.5G 30G 20% / tmpfs 1.9G 0 1.9G 0% /run/shm

du reports on the disk space usage of specific files or directories.

Reporting Directory Size:

bash

Show total size of the current directory and its contents in human readable format

$ du -sh . 1.2G .

Listing Sizes of Subdirectories:

bash

$ du -h --max-depth=1 /var 4.0K /var/mail 78M /var/log 4.2G /var/lib 4.3G /var