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 1.4 2007/12/14 23:16:55 swildner 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 c Ar clusize 44.Op Fl S 45.Op Fl U Ar uuid 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 U Ar uuid 67All HAMMER filesystems are assigned a globally unique UUID. 68If no UUID is specified one will be synthesized. 69.It Fl S 70Force the HAMMER filesystem to be formatted with a supercluster layer, 71allowing it to support volumes greater than 2TB. 72This option is automatically enabled if formatting HAMMER on a large disk. 73.It Fl c Ar clusize 74HAMMER organizes file objects in clusters and superclusters. 75Clusters default to the maximum size, which is 64MB. 76A smaller size may be chosen if desired. 77This option is not recommended. 78HAMMER will use a truncated cluster as the last cluster and still use 79all available disk space regardless of the cluster size. 80.El 81.\".Sh NOTES 82.Sh EXAMPLES 83.Bd -literal -offset indent 84newfs_hammer -L Home /dev/ad0s1d 85.Ed 86.Pp 87Create a file system named 88.Sq Home 89on 90.Pa /dev/ad0s1d . 91.Sh DIAGNOSTICS 92Exit status is 0 on success and 1 on error. 93.Sh SEE ALSO 94.Xr disklabel 8 , 95.Xr fdisk 8 , 96.Xr newfs 8 97.Sh HISTORY 98The 99.Nm 100utility first appeared in 101.Dx 1.11 . 102.Sh AUTHORS 103.An Matthew Dillon Aq dillon@backplane.com 104