xref: /netbsd/sbin/newfs_lfs/newfs_lfs.8 (revision 3fb18954)

.\"	$NetBSD: newfs_lfs.8,v 1.6 2000/02/05 11:57:30 enami Exp $
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.\" Copyright (c) 1993
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.\"     @(#)newlfs.8	8.1 (Berkeley) 6/19/93
.\"
.Dd July 15, 1999
.Dt NEWFS_LFS 8
.Os BSD 4.4
.Sh NAME
.Nm newfs_lfs
.Nd construct a new LFS file system
.Sh SYNOPSIS
.Nm
.Op Ar newfs_lfs-options
.Ar special
.Sh DESCRIPTION
.Nm
builds a log-structured file system on the specified special
device basing its defaults on the information in the disk label.
Before running
.Nm
the disk must be labeled using
.Xr disklabel 8 ,
the proper fstype is 4.4LFS.  Reasonable values for the
.Li fsize,
.Li bsize,
and
.Li cpg
(really
.Li sgs,
segment shift) fields are 1024, 8192, and 7 respectively.
.Pp
The following options define the general layout policies.
.Bl -tag -width Fl
.It Fl B Ar logical-segment-size
The logical segment size of the file system in bytes.  If not specified,
the segment size is computed by left-shifting the partition label's block
size by the amount indicated in the partition table's segshift.  If the
disklabel indicates a zero block size or segment shift, a compile-time default
segment size of 1M is used.
.It Fl b Ar block-size
The block size of the file system in bytes.  If not specified, the block
size is taken from the partition label, or if the partition label
indicates 0, a compile-time default of 8K is used.
.It Fl f Ar fragment-size
The fragment size of the file system in bytes.  If not specified,
the fragment size is taken from the partition label, or if the partition
label indicates 0, a compile-time default of 1K is used.
.It Fl L
Create a log-structured file system (LFS).  This is the default, and this
option is provided for compatibility only.
.It Fl m Ar free space \&%
The percentage of space reserved from normal users; the minimum
free space threshold.  The default value used is 10%.
See
.Xr tunefs 8
for more details on how to set this option.
.It Fl N
Do not actually create the filesystem.
.It Fl s Ar size
The size of the file system in sectors.
.El
.Sh SEE ALSO
.Xr disktab 5 ,
.\" .Xr fs 5 ,
.Xr dumplfs 8 ,
.Xr disklabel 8 ,
.Xr diskpart 8
.\" .Xr tunefs 8
.Rs
.%A M. Seltzer
.%A K. Bostic
.%A M. McKusick
.%A C. Staelin
.%T "An Implementation of a Log-Structured File System for UNIX"
.%J "Proceedings of the Winter 1993 USENIX Conference"
.%D January 25-29, 1993
.%P pp. 315-331
.Re
.Sh HISTORY
A \fBnewlfs\fR
command appeared in
.Bx 4.4 ,
and was renamed to
.Nm
for
.Nx 1.4.