4.3BSD-UWisc/man/cat8/newfs.8

NEWFS(8)            UNIX Programmer's Manual             NEWFS(8)



NAME
     newfs - construct a new file system

SYNOPSIS
     /etc/newfs [ -N ] [ -v ] [ -n ] [ mkfs-options ] special
     disk-type

DESCRIPTION
     _N_e_w_f_s is a ``friendly'' front-end to the _m_k_f_s(8) program.
     _N_e_w_f_s will look up the type of disk a file system is being
     created on in the disk description file /_e_t_c/_d_i_s_k_t_a_b, calcu-
     late the appropriate parameters to use in calling _m_k_f_s, then
     build the file system by forking _m_k_f_s and, if the file sys-
     tem is a root partition, install the necessary bootstrap
     programs in the initial 8 sectors of the device.  The -n
     option prevents the bootstrap programs from being installed.
     The -N option causes the file system parameters to be
     printed out without actually creating the file system.

     If the -v option is supplied, _n_e_w_f_s will print out its
     actions, including the parameters passed to _m_k_f_s.

     Options which may be used to override default parameters
     passed to _m_k_f_s are:

     -s size   The size of the file system in sectors.

     -b block-size
               The block size of the file system in bytes.

     -f frag-size
               The fragment size of the file system in bytes.

     -t #tracks/cylinder

     -c #cylinders/group
               The number of cylinders per cylinder group in a
               file system.  The default value used is 16.

     -m free space %
               The percentage of space reserved from normal
               users; the minimum free space threshhold.  The
               default value used is 10%.

     -o optimization preference (``space'' or ``time'')
               The file system can either be instructed to try to
               minimize the time spent allocating blocks, or to
               try to minimize the space fragmentation on the
               disk.  If the value of minfree (see above) is less
               than 10%, the default is to optimize for space; if
               the value of minfree greater than or equal to 10%,
               the default is to optimize for time.



Printed 12/27/86          May 21, 1986                          1






NEWFS(8)            UNIX Programmer's Manual             NEWFS(8)



     -r revolutions/minute
               The speed of the disk in revolutions per minute
               (normally 3600).

     -S sector-size
               The size of a sector in bytes (almost never any-
               thing but 512).

     -i number of bytes per inode
               This specifies the density of inodes in the file
               system.  The default is to create an inode for
               each 2048 bytes of data space.  If fewer inodes
               are desired, a larger number should be used; to
               create more inodes a smaller number should be
               given.

FILES
     /etc/disktab   for disk geometry and file system partition
     information
     /etc/mkfs to actually build the file system
     /usr/mdec for boot strapping programs

SEE ALSO
     disktab(5), fs(5), diskpart(8), fsck(8), format(8), mkfs(8),
     tunefs(8)

     M. McKusick, W. Joy, S. Leffler, R. Fabry, ``A Fast File
     System for UNIX'', _A_C_M _T_r_a_n_s_a_c_t_i_o_n_s _o_n _C_o_m_p_u_t_e_r _S_y_s_t_e_m_s _2,
     3.  pp 181-197, August 1984.  (reprinted in the System
     Manager's Manual, SMM:14)

BUGS
     Should figure out the type of the disk without the user's
     help.





















Printed 12/27/86          May 21, 1986                          2