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38 .Nd mount a HAMMER file system
42 .Op Fl T Ar transaction-id
47 .Op Fl T Ar transaction-id
48 .Ar special Ns Oo Cm \&: Ns Ar special Oc Ns *
61 file(s) at mount point
64 The options are as follows:
65 .Bl -tag -width indent
67 Options are specified with a
69 flag followed by a comma separated string of options.
72 man page for possible options and their meanings.
75 specific options are also available:
76 .Bl -tag -width indent
78 Put the entire file system in no-history mode.
79 Change history is not retained.
80 Use of this option may increase the overhead of doing mirroring.
81 This option is generally only used in an emergency.
82 .It Cm master= Ns Ar id
83 Assign a master id for the entire mount which applies to all PFSs under
85 This is intended to help support multi-master and fail-over operation.
86 Multi-master operation is not yet supported.
88 to upgrade slaves to masters and downgrade masters to slaves as part of
89 a fail-over setup, it's a good idea to assign a different master id
92 mounts making up the fail-over group.
96 mount assigns a master id of 0.
97 You can force no-mirror operation by specifying this option.
99 mirror transaction id propagation in the B-Tree and will improve write
100 performance somewhat but also prevents incremental mirroring from working
101 at all, and is not recommended.
103 .It Fl T Ar transaction-id
104 Mount the file system as-of a particular
106 The mount will automatically be made read-only.
109 must be specified as a 64 bit hex value prefixed with "0x".
111 Update the mount point.
112 This is typically used to upgrade a mount to
113 read-write or downgrade it to read-only.
116 Note that issuing a read-only mount which requires UNDOs to be run will
117 still run the UNDOs, but will not flush the buffer cache buffers until/if
118 the mount is updated to read-write.
124 file system made up of two volumes onto
126 .Bd -literal -offset indent
127 mount_hammer -o ro,noatime /dev/ad0s1d /dev/ad1s1d /mnt
130 Above is equivalent to below using blkdevs format for
134 supports both formats.
135 .Bd -literal -offset indent
136 mount_hammer -o ro,noatime /dev/ad0s1d:/dev/ad1s1d /mnt
142 .Bd -literal -offset indent
143 /dev/ad0s1d:/dev/ad1s1d /mnt hammer ro,noatime
160 utility first appeared in
163 .An Matthew Dillon Aq Mt dillon@backplane.com