newfs(1M)               (BSD Compatibility Package)               newfs(1M)


   NAME
         newfs - construct a new file system

   SYNOPSIS
         /usr/ucb/newfs [ -nNv ] [ mkfs-options ] block-special-file

   DESCRIPTION
         newfs is a friendly front-end to the mkfs(1M) program.  On Sun
         systems, the disk type is determined by reading the disk label for
         the specified block-special-file.

         block-special-file is the name of a block special device residing in
         /dev.  If you want to make a file system on sd0, you can specify sd0
         rsd0 or /dev/rsd0; if you only specify sd0, newfs will find the
         proper device.

         newfs then calculates the appropriate parameters to use in calling
         mkfs, builds the file system by forking mkfs and, if the file system
         is a root partition, installs the necessary bootstrap programs in its
         initial 16 sectors.

   OPTIONS
         -n    Do not install the bootstrap programs.

         -N    Print out the file system parameters without actually creating
               the file system.

         -v    Verbose.  newfs prints out its actions, including the
               parameters passed to mkfs.

         mkfs-options
               Options that override the default parameters passed to mkfs(1M)
               are:

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

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

               -d rotdelay
                     This specifies the expected time (in milliseconds) to
                     service a transfer completion interrupt and initiate a
                     new transfer on the same disk.  It is used to decide how
                     much rotational spacing to place between successive
                     blocks in a file.

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



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   newfs(1M)               (BSD Compatibility Package)               newfs(1M)


               -i bytes/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.

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

               -o optimization
                     (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 minimum free space threshold (as
                     specified by the -m option) is less than 10%, the default
                     is to optimize for space; if the minimum free space
                     threshold is greater than or equal to 10%, the default is
                     to optimize for time.

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

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

               -t #tracks/cylinder
                     The number of tracks per cylinders on the disk.

   FILES
         /usr/mdec       for boot strapping programs
         /dev

   SEE ALSO
         fsck(1M), mkfs(1M), tunefs(1M), fs(4) in the System Administrator's
         Reference Manual.














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