df_ufs(1m) - osol9

1df_ufs(1M)              System Administration Commands              df_ufs(1M)
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NAME

6       df_ufs - report free disk space on ufs file systems
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SYNOPSIS

9       df -F ufs [generic_options] [-o i] [directory | special]
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DESCRIPTION

13       df  displays the amount of disk space occupied by ufs file systems, the
14       amount of used and available space, and how much of the  file  system's
15       total  capacity  has been used.The amount of space reported as used and
16       available is less than the amount of space in the file system; this  is
17       because  the system reserves a fraction of the space in the file system
18       to allow its file system allocation routines to work well.  The  amount
19       reserved is typically about 10%; this can be adjusted using tunefs(1M).
20       When all the space on the file system except for  this  reserve  is  in
21       use,  only  the  superuser  can  allocate  new files and data blocks to
22       existing files. When the file system is overallocated in this  way,  df
23       might report that the file system is more than 100% utilized.If neither
24       directory nor special is specified, df  displays  information  for  all
25       mounted ufs file systems.
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OPTIONS

28       The following options are supported:
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30       generic_options    Options  supported  by  the  generic df command. See
31                          df(1M) for a description of these options.
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34       -o                 Specify ufs file system specific options. The avail‐
35                          able option is:
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37                          i    Report the number of used and free inodes. This
38                               option can not be used with generic_options.
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FILES

43       /etc/mnttab    list of file systems currently mounted
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ATTRIBUTES

47       See attributes(5) for descriptions of the following attributes:
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52       ┌─────────────────────────────┬─────────────────────────────┐
53       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
54       ├─────────────────────────────┼─────────────────────────────┤
55       │Availability                 │SUNWcsu, SUNWxcu4            │
56       └─────────────────────────────┴─────────────────────────────┘
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NOTES

63       df  calculates  its  results differently for mounted and unmounted file
64       systems. For unmounted systems, the numbers reflect  the  10%  reserva‐
65       tion.  This  reservation is not reflected in df output for mounted file
66       systems. For this reason, the available space reported by  the  generic
67       command can differ from the available space reported by this module.
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70       df  might report remaining capacity even though syslog warns filesystem
71       full. This issue can occur because df only uses the available  fragment
72       count  to  calculate available space, but the file system requires con‐
73       tiguous sets of fragments for most allocations.
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76       If you suspect that you have exhausted  contiguous  fragments  on  your
77       file  system,  you can use the fstyp(1M) utility with the -v option. In
78       the fstyp output, look at the nbfree (number of blocks free) and nffree
79       (number  of  fragments  free) fields. On unmounted filesystems, you can
80       use fsck(1M) and observe the last line of output, which reports,  among
81       other  items,  the number of fragments and the degree of fragmentation.
82       See fsck(1M).
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86SunOS 5.11                        25 Feb 2005                       df_ufs(1M)