NetBSD/sbin/newfs_lfs/newfs_lfs.8

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.\" $NetBSD: newfs_lfs.8,v 1.8 2000/07/04 22:35:05 perseant Exp $
.\"
.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
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.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
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.\" may be used to endorse or promote products derived from this software
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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
Force creation of an LFS even on a partition labeled as another type.
.Nm
will use compile-time default values for block and fragment size, and segment
shift, unless these are overridden by command-line flags.
.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%.
.It Fl M Ar nsegs
Reserve this many segments for use exclusively by the cleaner, instead
of letting
.Nm
do the computation. Do not use 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.