1 .\" Copyright (c) 2007 The DragonFly Project. All rights reserved.
3 .\" This code is derived from software contributed to The DragonFly Project
4 .\" by Matthew Dillon <dillon@backplane.com>
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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
39 .Nd construct a new HAMMER file system
50 utility creates a HAMMER filesystem on device
52 If multiple devices are specified a single HAMMER filesystem is created
53 which spans all of them.
54 HAMMER filesystems are sector-size agnostic, however the
56 implementation requires the sector size to be no larger than 16K.
57 HAMMER filesystems start at a relative offset of 0 and may only be created
58 under out-of-band disk labels (disklabel64 or gpt labels), or in standard
59 disklabel partitions which do not overlap the label area.
61 The options are as follows:
62 .Bl -tag -width indent
64 All HAMMER filesystems must be named and names should be unique on a
67 Specify a fixed area in which a boot related kernel and data can be stored.
68 By default a boot area of approximately 4MB will be created.
70 Specify a fixed area which HAMMER may use as a memory log. This area is
73 Specify the size of the fixed UNDO FIFO. By default 0.1% of the root
74 volume's size is used, with a reasonable minimum and a reasonable cap.
75 The UNDO FIFO is used to sequence meta-data out to the media for instant
80 .Bd -literal -offset indent
81 newfs_hammer -L Home /dev/ad0s1d
84 Create a file system named
89 Exit status is 0 on success and 1 on error.
97 utility first appeared in
100 .An Matthew Dillon Aq dillon@backplane.com