Installation guide

With no arguments or options, the df command displays the amount of free
disk space on all of the mounted file systems. For each file system, the df
command reports the file system’s configured size in 512-byte blocks, unless
you specify the −k option, which reports the size in kilobyte blocks. The
command displays the total amount of space, the amount presently used,
the amount presently available (free), the percentage used, and the
directory on which the file system is mounted.
For AdvFS file domains, the df command displays disk space usage
information for each fileset.
If you specify a device that has no file systems mounted on it, df displays
the information for the root file system.
You can specify a file pathname to display the amount of available disk
space on the file system that contains the file.
Refer to the df
(1) reference page for more information.
_______________________ Note _______________________
You cannot use the df command with the block or character
special device name to find free space on an unmounted file
system. Instead, use the dumpfs command.
The following example displays disk space information about all the
mounted file systems:
# /sbin/df
Filesystem 512-blks used avail capacity Mounted on
/dev/rz2a 30686 21438 6178 77% /
/dev/rz0g 549328 378778 115616 76% /usr
/dev/rz2g 101372 5376 85858 5% /var
/dev/rz3c 394796 12 355304 0% /usr/users
/usr/share/man@tsts 557614 449234 52620 89% /usr/share/man
domain#usr 838432 680320 158112 81% /usr
_______________________ Note _______________________
The newfs command reserves a percentage of the file system
disk space for allocation and block layout. This can cause the df
command to report that a file system is using more than 100
percent of its capacity. You can change this percentage by using
the tunefs command with the −minfree flag.
7–22 Administering the UNIX File System