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 1.6.2.2 2008/07/25 03:18:36 swildner Exp $
39 .Nd construct a new HAMMER file system
51 utility creates a HAMMER filesystem on device
53 If multiple devices are specified a single HAMMER filesystem is created
54 which spans all of them.
55 HAMMER filesystems are sector-size agnostic, however the
57 implementation requires the sector size to be no larger than 16K.
58 HAMMER filesystems start at a relative offset of 0 and may only be created
59 under out-of-band disk labels (disklabel64 or gpt labels), or in standard
60 disklabel partitions which do not overlap the label area.
62 The options are as follows:
63 .Bl -tag -width indent
65 All HAMMER filesystems must be named and names should be unique on a
68 Specify a fixed area in which a boot related kernel and data can be stored.
69 By default a boot area of approximately 4MB will be created.
71 Force the creation of a HAMMER file system with less than 100M UNDO FIFO.
72 This should not be used under normal circumstances.
74 Specify a fixed area which HAMMER may use as a memory log. This area is
77 Specify the size of the fixed UNDO FIFO. By default 0.1% of the root
78 volume's size is used, with a reasonable minimum and a reasonable cap.
79 The UNDO FIFO is used to sequence meta-data out to the media for instant
84 .Bd -literal -offset indent
85 newfs_hammer -L Home /dev/ad0s1d
88 Create a file system named
93 Exit status is 0 on success and 1 on error.
102 utility first appeared in
105 .An Matthew Dillon Aq dillon@backplane.com