System Administration Commands                         dfufs(1M)



NAME
     dfufs - report free disk space on ufs file systems

SYNOPSIS
     df -F ufs [genericoptions] [-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:

     genericoptions    Options supported by the generic df  com-
                        mand.  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 genericoptions.



FILES
     /etc/mnttab    list of file systems currently mounted


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:







SunOS 5.11          Last change: 25 Feb 2005                    1






System Administration Commands                         dfufs(1M)



     
           ATRIBUTE TYPE               ATRIBUTE 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 5.11          Last change: 25 Feb 2005                    2