MKFS(8)MKFS(8)NAMEmkfs - construct a file system
SYNOPSIS
/usr/etc/mkfs [ -N ] special size [ nsect [ ntrack [ blksize [ fragsize
[ ncpg [ minfree [ rps [ nbpi [ opt ] ] ] ] ] ] ] ] ]
DESCRIPTION
N.B.: file system are normally created with the newfs(8) command.
Mkfs constructs a file system by writing on the special file special
unless the -N flag has been specified. 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
i-nodes is calculated as a function of the file system size. No boot
program is initialized by mkfs (see newfs(8).)
The optional arguments allow fine tune control over the parameters of
the file system. Nsect specify the number of sectors per track on the
disk. Ntrack specify 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 disk blocks. The default value is 10%. If a disk does not
revolve at 60 revolutions per second, the rps parameter may be
specified. If a file system will have more or less than the average
number of files the nbpi (number of bytes per inode) can be specified
to increase or decrease the number of inodes that are created. Space
or time optimization preference can be specified with opt values of
``s'' for space or ``t'' for time. Users with special demands for
their file systems are referred to the paper cited below for a
discussion of the tradeoffs in using different configurations.
SEE ALSOfs(5), dir(5), fsck(8), newfs(8), tunefs(8)
M. McKusick, W. Joy, S. Leffler, R. Fabry, ``A Fast File System for
UNIX'', ACM Transactions on Computer Systems 2, 3. pp 181-197, August
1984. (reprinted in the System Manager's Manual, SMM:14)
BUGS
There should be some way to specify bad blocks.
4th Berkeley Distribution May 21, 1986 MKFS(8)