180 lines
6.0 KiB
Groff
180 lines
6.0 KiB
Groff
.\" $NetBSD: newfs_lfs.8,v 1.22 2009/04/08 13:13:42 joerg Exp $
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.\"
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)newlfs.8 8.1 (Berkeley) 6/19/93
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.\"
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.Dd July 12, 2001
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.Dt NEWFS_LFS 8
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.Os
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.Sh NAME
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.Nm newfs_lfs
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.Nd construct a new LFS file system
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.Sh SYNOPSIS
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.Nm
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.Op Ar newfs_lfs-options
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.Ar special
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.Sh DESCRIPTION
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.Nm
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builds a log-structured file system on the specified special
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device basing its defaults on the information in the disk label.
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Before running
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.Nm
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the disk must be labeled using
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.Xr disklabel 8 ,
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the proper fstype is 4.4LFS.
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Reasonable values for the
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.Li fsize ,
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.Li bsize ,
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and
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.Li sgs
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fields are 1024, 8192, and 7 respectively.
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.Pp
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The following options define the general layout policies.
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.Bl -tag -width Fl
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.It Fl A
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Attempt to compute the appropriate segment size using the formula
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.Em 4 * bandwidth * access time .
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The disk is tested for twenty seconds
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to discover its bandwidth and seek time.
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.It Fl B Ar logical-segment-size
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The logical segment size of the file system in bytes.
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If not specified, the segment size is computed by left-shifting
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the partition label's block size by the amount indicated in the
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partition table's segshift.
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If the disklabel indicates a zero block size or segment shift,
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a compile-time default segment size of 1M is used.
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.It Fl b Ar block-size
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The block size of the file system in bytes.
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If not specified, the block size is taken from the partition label,
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or if the partition label indicates 0,
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a compile-time default of 8K is used.
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.It Fl F
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Force creation of an LFS even on a partition labeled as another type.
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.Nm
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will use compile-time default values for block and fragment size, and segment
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shift, unless these are overridden by command-line flags.
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.It Fl f Ar fragment-size
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The fragment size of the file system in bytes.
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If not specified, the fragment size is taken from the partition label,
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or if the partition label indicates 0,
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a compile-time default of 1K is used.
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.It Fl I Ar interleave
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Specify the interleave between segments.
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The default is zero.
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.It Fl i
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The size of an inode block, in bytes.
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The default is to use the same size as a fragment,
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or in a v1 filesystem, the same size as a data block.
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.It Fl L
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Create a log-structured file system (LFS).
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This is the default, and this
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option is provided for compatibility only.
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.It Fl M Ar nsegs
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Specify
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.Em lfs_minfreeseg ,
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the number of segments left out of the amount allocated to user data.
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A higher number increases cleaner performance, while a lower number
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gives more usable space.
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The default is based on the size of the filesystem, either 5% of the
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total number of segments or 20 segments, whichever is larger.
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.It Fl m Ar free space \&%
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The percentage of space reserved from normal users; the minimum
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free space threshold.
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The default value used is 10%.
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.It Fl N
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Do not actually create the filesystem.
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.It Fl O Ar offset
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Start the first segment this many sectors from the beginning of the
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partition.
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The default is zero.
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.It Fl R Ar nsegs
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Specify
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.Em lfs_resvseg ,
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the number of segments set aside for the exclusive use of the cleaner.
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A larger figure reduces the likelihood of running out of clean segments,
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but if
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.Em lfs_resvseg
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is too close to
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.Em lfs_minfreeseg ,
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the cleaner will run without ceasing when the filesystem becomes close to
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full. The default is the larger of 15 or the quantity
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.Em lfs_minfreeseg
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/ 2 + 1 .
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.It Fl r Ar ident
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For a v2 filesystem, specify the roll-forward identifier for the
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filesystem.
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This identifier, a 32-bit numeric quantity,
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should be different from that of any LFS that may previously
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have existed on the same disk.
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By default the identifier is chosen at random.
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.It Fl s Ar size
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The size of the file system in sectors.
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.It Fl v Ar version
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Make a filesystem with the specified disk layout version.
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Valid options are 1 or 2 (the default).
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.Em Note ,
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however, that LFS version 1 is deprecated.
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.El
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.Sh SEE ALSO
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.Xr disktab 5 ,
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.\" .Xr fs 5 ,
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.Xr disklabel 8 ,
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.Xr diskpart 8 ,
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.Xr dumplfs 8
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.\" .Xr tunefs 8
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.Rs
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.%A M. Seltzer
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.%A K. Bostic
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.%A M. McKusick
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.%A C. Staelin
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.%T "An Implementation of a Log-Structured File System for UNIX"
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.%J "Proceedings of the Winter 1993 USENIX Conference"
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.%D January 25-29, 1993
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.%P pp. 315-331
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.Re
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.Rs
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.%A J. Matthews
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.%A D. Roselli
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.%A A. Costello
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.%A R. Wang
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.%A T. Anderson
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.%T "Improving the Performance of Log-Structured File Systems with Adaptive Methods"
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.%J "Proceedings of the Sixteenth ACM SOSP"
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.%D October 1997
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.Re
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.Sh HISTORY
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A
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.Ic newlfs
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command appeared in
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.Bx 4.4 ,
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and was renamed to
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.Nm
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for
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.Nx 1.4 .
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