Note: You can specify a directory other than /. ie if you wanted to review the contents of /var, you would format the command as follows:
``` ncdu /var ``` ##### [Find](https://linux.die.net/man/1/find) We can also use the find command to locate files over a specified size. ``` find / -type f -size +300M > filelist.txt ``` The above command would search / (and all subdirectories) for any files over 300M in size. There are various options available for size specification: - G-> for gibibytes - M-> for megabytes - K-> for kibibytes - b-> for bytes ------------------------------------------------------------------------------------------------------------------------------------------ #### Quick wins /var/log/journal - this can be vacuumed to reduce the size: ``` journalctl --vacuum-size=500M ``` ##### View largest directories in / ``` du -h --max-depth=1 / 2> /dev/null ``` ------------------------------------------------------------------------------------------------------------------------------------------ ##### Disk Reserve Most linux filesystems (depending on FS type) will have a segment reserved for special processes. The default percentage is 5. We can use the [tune2fs](https://linux.die.net/man/8/tune2fs) command for ext2/ext3/ext4 filesystems. Check disk reserve: ``` tune2fs -l /dev/partition ``` Changing disk reserve: ``` tune2fs -m2 /dev/partition ``` ------------------------------------------------------------------------------------------------------------------------------------------ #### Inodes Check for inode usage: ``` du --inodes -d 1 / 2>/dev/null ```