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System Administration Commands df_ufs(1M)
NAME
df_ufs - report free disk space on ufs file systems
SYNOPSIS
df -F ufs [generic_options] [ -o i] [directory | special]
DESCRIPTION
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.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 can be
adjusted using tunefs(1M). When all the space on the file
system except for this reserve is in use, only the superuser
can allocate new files and data blocks to existing files.
When the file system is overallocated in this way, df might
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.
OPTIONS
The following options are supported:
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 can not be used
with generic_options.
FILES
/etc/mnttab list of file systems currently mounted
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 25 Feb 2005 1
System Administration Commands df_ufs(1M)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu, SUNWxcu4 |
|_____________________________|_____________________________|
SEE ALSO
df(1M), fsck(1M), fstyp(1M), tunefs(1M), mnttab(4), attri-
butes(5), ufs(7FS),
NOTES
df calculates its results differently for mounted and
unmounted file systems. For unmounted systems, the numbers
reflect the 10% reservation. This reservation is not
reflected in df output for mounted file systems. For this
reason, the available space reported by the generic command
can differ from the available space reported by this module.
df might report remaining capacity even though syslog warns
filesystem full. This issue can occur because df only uses
the available fragment count to calculate available space,
but the file system requires contiguous sets of fragments
for most allocations.
If you suspect that you have exhausted contiguous fragments
on your file system, you can use the fstyp(1M) utility with
the -v option. In the fstyp output, look at the nbfree
(number of blocks free) and nffree (number of fragments
free) fields. On unmounted filesystems, you can use fsck(1M)
and observe the last line of output, which reports, among
other items, the number of fragments and the degree of frag-
mentation. See fsck(1M).
SunOS 5.10 Last change: 25 Feb 2005 2
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This page was generated on Wed Sep 12 11:25:53 GMT 2007
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