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/mount_hammer/mount_hammer.8,v 1.9.2.2 2008/07/19 18:49:09 dillon Exp $
39 .Nd mount a HAMMER file system
42 .Op Fl o Ar mount-options
43 .Op Fl T Ar transaction-id
48 .Op Fl o Ar mount-options
53 utility mounts a HAMMER filesystem backed by one or more block devices.
55 files can be separated by colon,
57 instead of blanks, this is usefull in
60 The options are as follows:
61 .Bl -tag -width indent
62 .It Fl o Ar mount-options
63 Specify mount options, which are a comma delimited set of options (see
65 Supported mount options are:
66 .Bl -tag -width indent
68 Issue a read-only mount.
70 Put the entire filesystem in no-history mode. Change history is not
72 Use of this option may increase the overhead of doing mirroring.
73 This option is generally only used in an emergency.
75 Assign a master id for the entire mount which applies to all PFSs under
76 the mount. This is intended to help support multi-master and fail-over
77 operation. Multi-master operation is not yet supported. If you intend
78 to upgrade slaves to masters and downgrade masters to slaves as part of
79 a fail-over setup, it's a good idea to assign a different master id
80 to the HAMMER mounts making up the fail-over group.
82 By default a HAMMER mount assigns a master id of 0. You can force
83 no-mirror operation by specifying this option. This option disables
84 mirror transaction id propagation in the B-Tree and will improve write
85 performance somewhat but also prevents incremental mirroring from working
86 at all, and is not recommended.
88 .It Fl T Ar transaction-id
89 Mount the filesystem as-of a particular
91 The mount will automatically be made read-only.
94 must be specified as a 64 bit hex value prefixed with "0x".
96 Update the mount point. This is typically used to upgrade a mount to
97 read-write or downgrade it to read-only.
100 Note that issuing a read-only mount which requires UNDOs to be run will
101 still run the UNDOs, but will not flush the buffer cache buffers until/if
102 the mount is updated to read-write.
104 .Bd -literal -offset indent
105 mount_hammer -o ro,noatime /dev/ad0s1d /dev/ad1s1d /mnt
108 Mount a HAMMER filesystem made up of two volumes onto
111 Exit status is 0 on success and 1 on error.
125 utility first appeared in
128 .An Matthew Dillon Aq dillon@backplane.com