df_ufs(1M) manual page
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df_ufs - report free disk space on ufs file systems
df -F
ufs [ generic_options ] [ -o i ] [ directory|special ]
SUNWcsu
SUNWxcu4
df displays the amount of disk space occupied by
ufs file systems, the amount of used and available space, and how much
of the file system’s total capacity has been used.
Note that the amount of
space reported as used and available is less than the amount of space in
the file system; this is because the system reserves a fraction of the
space in the file system to allow its file system allocation routines to
work well. The amount reserved is typically about 10%; this may be adjusted
using tunefs(1M)
. When all the space on the file system except for this
reserve is in use, only the super-user can allocate new files and data blocks
to existing files. When the file system is overallocated in this way, df
may report that the file system is more than 100% utilized.
If neither directory
nor special is specified, df displays information for all mounted ufs
file systems.
- generic_options
- Options supported by the generic df
command. See df(1M)
for a description of these options.
- -o
- Specify ufs file
system specific options. The available option is:
- i
- Report the number of
used and free inodes. This option may not be used with generic_options.
- /etc/mnttab
- list of file systems currently mounted
df(1M)
, tunefs(1M)
,
fs_ufs(4)
, mnttab(4)
df calculates its results differently for mounted
and unmounted file systems. For unmounted systems, the numbers reflect the
10% reservation mentioned above; this reservation is not reflected in
df output for mounted file systems. For this reason, the available space
reported by the generic command may differ from the available space reported
by this module.
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