mkfs man page on Ultrix

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mkfs(8)								       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 Manager 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 sys‐
       tem 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.

       If the user-specified value for nbpi exceeds the maximum value allowed,
       the user is not notified by (or by ).

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

								       mkfs(8)
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