mkfs(8) 						      System Manager's Manual							   mkfs(8)

Name
       mkfs - construct a file system

Syntax
       /etc/mkfs [ -N ] special size [ nsect ] [ ntrack ] [ blksize ]
       [ fragsize ] [ ncpg ] [ minfree] [ rps ] [ nbpi ] [ opt ]

Description
       File systems are normally created with the command.

       The -N option is used to run in no update mode.	In this mode, will not write to

       The  command constructs a file system by writing on the special file special.  The numeric size specifies the number of sectors in the file
       system.	The command builds a file system with a root directory and a lost+found directory.  For further information, see The number of	i-
       nodes is calculated as a function of the file system size.  No boot program is initialized by For further information, see

       When  the  on-disks  inodes  of	the  file  system  are written, each contains a unique number in its generation number field.  This number
       uniquely identifies each inode in a file system.

       The optional arguments allow fine tune control over the parameters of the file system.  The nsect argument specifies the number of  sectors
       per  track  on the disk.  The ntrack argument specifies the number of tracks per cylinder on the disk.  The blksize argument gives the pri-
       mary block size for files on the file system.  It must be a power of two, currently selected from 4096  or  8192.   The	fragsize  argument
       gives  the  fragment  size  for	files on the file system.  The fragsize argument represents the smallest amount of disk space that will be
       allocated to a file.  It must be a power of two currently selected from the range 512 to 8192.  The ncpg argument specifies the	number	of
       disk  cylinders	per  cylinder  group.  This number must be in the range 1 to 32.  The minfree argument specifies the minimum percentage of
       free disk space allowed.  Once the file system capacity reaches this threshold, only the superuser is allowed to allocate disk blocks.  The
       default	value  is  10%.   If a disk does not revolve at 60 revolutions per second, the rps parameter may be specified.	Users with special
       demands for their file systems are referred to ``A Fast File System for UNIX'' in the ULTRIX Supplementary Documents, Volume 3: System Man-
       ager  for  a  discussion  of  the tradeoffs in using different configurations.  The nbpi argument specifies the number (ratio) of bytes per
       inode.  The default is 2048 bytes.  The opt argument is used to indicate the whether the file system should optimize  for  space  or  time.
       The opt argument can be assigned a value of s or t.

Restrictions
       If is invoked without arguments, the RISC machines dump core instead of returning an error.

See Also
       dir(5), fs(5), fsck(8), newfs(8), tunefs(8)
       "A Fast File System for UNIX", Supplementary Documents, Volume 3: System Manager

																	   mkfs(8)