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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 1.10 2008/07/27 16:47:19 thomas Exp $
39 .Nd construct a new HAMMER file system
55 If multiple devices are specified a single
57 file system is created
58 which spans all of them.
61 will constitute a volume which the
63 file system is built on.
65 file systems are sector-size agnostic, however the
67 implementation requires the sector size to be no larger than 16K.
69 file systems start at a relative offset of 0 and may only be created
70 under out-of-band disk labels
79 partitions which do not overlap the label area.
81 The options are as follows:
82 .Bl -tag -width indent
86 file systems must be named and names should be unique on a
89 Specify a fixed area in which a boot related kernel and data can be stored.
92 is specified in bytes.
93 By default a boot area of approximately 4MB will be created.
95 Force the creation of a
97 file system with less than 100M UNDO FIFO.
98 This should not be used under normal circumstances.
100 Specify a fixed area which
102 may use as a memory log.
103 This area is currently unused.
106 is specified in bytes.
108 Specify the size of the fixed UNDO FIFO.
111 is specified in bytes.
112 By default 0.1% of the root
113 volume's size is used, with a reasonable minimum and a reasonable cap.
114 The UNDO FIFO is used to sequence meta-data out to the media for instant
123 can be given with a suffix of
127 meaning kilo, mega, giga and tera. Lower case can also be used for suffix.
129 .Bd -literal -offset indent
130 newfs_hammer -L Home /dev/ad0s1d
133 Create a file system named
138 Exit status is 0 on success and 1 on error.
149 utility first appeared in
152 .An Matthew Dillon Aq dillon@backplane.com