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newfs(8) [bsd man page]

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

newfs - construct a new file system SYNOPSIS
/sbin/newfs [ -N ] [ -m free-gap ] [ -n free-modulus ] [ -i bytes ] [ -s size ] [ -T disk-type ] special DESCRIPTION
Newfs is a ``friendly'' front-end to the mkfs(8) program. Newfs(8) will normally read the disklabel from the drive to determine the parti- tion sizes. If the driver for the disk does not support disklabels the -T option must be used to force a search of /etc/disktab for parti- tion information about drive-type. Newfs calculates the appropriate parameters to use in calling mkfs, then builds the file system by forking mkfs. -N causes the mkfs command which would be executed to be printed out without actually creating the file system. The disk specified by spe- cial must be online though so that newfs can read the disklabel. -m allows the specification of the block interleaving of the free list. If not specified or outside the range 1 thru 32 then a value of 2 is used. -n parameter is the freelist modulus (when the -m pattern repeats) and is calculated by newfs to be 1 cylinder in size by default. -i specifies how many bytes per inode to assume when calculating how many inodes to allocate. The default is 4096 bytes per inode. If this results in too few inodes being allocated (there is an absolute maximum of 65500) then decrease the bytes number (which must lie between 512 and 65536). -T must be used if the disk specified by special has not been labeled with the disklabel(8) program. In this case disk-type is used by getdisklabel(3) when searching /etc/disktab. This option is used when the underlying device driver does not support disklabels. Care must be taken that the contents of /etc/disktab match the partition tables in the kernel. -s specifies how many sectors the file system is to contain. There are two sectors per file system block, therefore size should be even. This parameter must be less than or equal to the partition size (as determined from the disklabel or /etc/disktab). An error is printed and no action is taken if the partition size is 0 or too large. NOTE: Mkfs deals in units of filesystem blocks not sectors. Newfs uses sectors. FILES
/etc/disktab disk geometry and partition information mkfs to actually build the file system SEE ALSO
getdisklabel(3), disklabel(8), disktab(5), diskpart(8), fs(5), fsck(8), mkfs(8) BUGS
newfs(8) no longer places boot blocks on the filesystem. That duty has been moved to the disklabel(8) program. If you must place a boot block on a disk whose driver does not support disklabels use dd(1). 4.2 Berkeley Distribution April 12, 1996 NEWFS(8)

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

       newfs - construct a new file system

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

       The command is a front-end to the program.  The program looks up the type of disk a file system is being created on in the disk description
       file calculates the appropriate parameters to use in calling then builds the file system by forking If the file system is a root partition,
       installs the necessary bootstrap program in the initial 16 sectors of the device.

       If there is no disk description for the specified disk type in the file, the program will use the subroutine to derive disk geometry infor-
       mation from the controlling device driver.  This functionality is provided for MSCP and SCSI disks.

       -N	 Runs in no update mode.  In this mode, will not write to

       -n	 Prevents the bootstrap program from being installed.

       -v	 Instructs to print out its actions, including the parameters passed to

       Options which may be used to override default parameters passed to 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 threshold.	The default value used is 10%.

       -o optimization
		 Specifies whether the file system will optimize for space or for time.

       -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 anything 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.

       For disk geometry and file system partition information

       To actually build the file system

       For boot strapping program

See Also
       disktab(5), fs(5), chpt(8), fsck(8), format(8v), creatediskbyname(3x), mkfs(8), tunefs(8)
       "A Fast File System for UNIX", Supplementary Documents, Volume 3: System Manager

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