MKFS(8)                 COMMAND REFERENCE                 MKFS(8)



NAME
     mkfs - construct a file system

SYNOPSIS
     /etc/mkfs special size [ nsect [ ntrack [ blksize [ fragsize
     [ ncpg [ minfree [ rps [ nbpi ]]]]]]]]

DESCRIPTION
     N.B.: file systems are normally created with the newfs(8)
     command.

     Mkfs constructs a file system by writing on the special file
     special. The numeric size specifies the number of sectors in
     the file system.  Mkfs builds a file system with a root
     directory and a lost+found directory.  (see fsck(8)) The
     number of inodes is calculated as a function of the file
     system size.  No boot program is initialized by mkfs (see
     newfs(8)).

     Mkfs must be run as super-user, since it must open special
     for reading.

OPTIONS
     The optional arguments allow fine tune control over the
     parameters of the file system.

     nsect
         Specifies the number of sectors per track on the disk.

     ntrack
         Specifies the number of tracks per cylinder on the disk.

     blksize
         Gives the primary block size for files on the file
         system.  It must be a power of two, currently selected
         from 4096 or 8192.

     fragsize
         Gives the fragment size for files on the file system.
         The fragsize 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.

     ncpg
         Specifies the number of disk cylinders per cylinder
         group.  This number must be in the range 1 to 32.

     minfree
         Specifies the minimum percentage of free disk space
         allowed.  Once the file system capacity reaches this
         threshold, only the super-user is allowed to allocate



Printed 10/17/86                                                1

MKFS(8)                 COMMAND REFERENCE                 MKFS(8)



         disk blocks.  The default value is 10%.

     rps If a disk does not revolve at 60 revolutions per second,
         the rps parameter may be specified.

     nbpi
         Specifies the number of inode blocks per cylinder group.

RETURN VALUE
     [NO_ERRS]      Command completed without error.

     [USAGE]        Incorrect command line syntax. Execution
                    terminated.

     [NP_WARN]      An error warranting a warning message
                    occurred. Execution continues.

     [NP_ERR]       An error occurred that was not a system
                    error.  Execution terminated.

     [P_ERR]        A system error occurred. Execution
                    terminated.  See intro(2) for more
                    information on system errors.

CAVEATS
     There is no way to specify bad blocks.

SEE ALSO
     fs(5), dir(5), fsck(8), newfs(8), tunefs(8).


























Printed 10/17/86                                                2

%%index%%
na:72,66;
sy:138,508;
de:646,832;
op:1478,1349;2971,299;
rv:3270,621;
ca:3891,95;
se:3986,174;
%%index%%000000000128