1.\" Copyright (c) 2007 The DragonFly Project. All rights reserved. 2.\" 3.\" This code is derived from software contributed to The DragonFly Project 4.\" by Matthew Dillon <dillon@backplane.com> 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in 14.\" the documentation and/or other materials provided with the 15.\" distribution. 16.\" 3. Neither the name of The DragonFly Project nor the names of its 17.\" contributors may be used to endorse or promote products derived 18.\" from this software without specific, prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" $DragonFly: src/sbin/newfs_hammer/newfs_hammer.8,v 1.6 2008/04/27 00:43:57 dillon Exp $ 34.Dd September 10, 2007 35.Dt NEWFS_HAMMER 8 36.Os 37.Sh NAME 38.Nm newfs_hammer 39.Nd construct a new HAMMER file system 40.Sh SYNOPSIS 41.Nm 42.Fl L Ar label 43.Op Fl b Ar bootsize 44.Op Fl m Ar savesize 45.Op Fl u Ar undosize 46.Ar special ... 47.Sh DESCRIPTION 48The 49.Nm 50utility creates a HAMMER filesystem on device 51.Ar special . 52If multiple devices are specified a single HAMMER filesystem is created 53which spans all of them. 54HAMMER filesystems are sector-size agnostic, however the 55.Dx 56implementation requires the sector size to be no larger than 16K. 57HAMMER filesystems start at a relative offset of 0 and may only be created 58under out-of-band disk labels (disklabel64 or gpt labels), or in standard 59disklabel partitions which do not overlap the label area. 60.Pp 61The options are as follows: 62.Bl -tag -width indent 63.It Fl L Ar label 64All HAMMER filesystems must be named and names should be unique on a 65per-machine basis. 66.It Fl b Ar bootsize 67Specify a fixed area in which a boot related kernel and data can be stored. 68By default a boot area of approximately 4MB will be created. 69.It Fl m Ar savesize 70Specify a fixed area which HAMMER may use as a memory log. This area is 71currently unused. 72.It Fl u Ar undosize 73Specify the size of the fixed UNDO FIFO. By default 0.1% of the root 74volume's size is used, with a reasonable minimum and a reasonable cap. 75The UNDO FIFO is used to sequence meta-data out to the media for instant 76crash recovery. 77.El 78.\".Sh NOTES 79.Sh EXAMPLES 80.Bd -literal -offset indent 81newfs_hammer -L Home /dev/ad0s1d 82.Ed 83.Pp 84Create a file system named 85.Sq Home 86on 87.Pa /dev/ad0s1d . 88.Sh DIAGNOSTICS 89Exit status is 0 on success and 1 on error. 90.Sh SEE ALSO 91.Xr disklabel 8 , 92.Xr fdisk 8 , 93.Xr newfs 8 94.Sh HISTORY 95The 96.Nm 97utility first appeared in 98.Dx 1.11 . 99.Sh AUTHORS 100.An Matthew Dillon Aq dillon@backplane.com 101