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7 .\" 1. Redistributions of source code must retain the above copyright
34 .Op Fl v
46 .Op Fl v
50 .Op Fl v
67 utility is used to track changes to a read-only disk on a writable disk.
68 Logically, a writable disk is placed over a read-only disk.
99 The union metadata exists only for the
115 If long-term persistance is desired,
124 .Bl -tag -width "destroy"
128 The second device given is used as the bottom device and need only be readable.
129 The second device may be mounted read-only but it is recommended
130 that it be unmounted and accessed only through a mount of the union device.
132 .Pa /dev/ Ns Ao Ar upperdev Ac Ns - Ns Ao Ar lowerdev Ac Ns Pa .union .
141 .Bl -tag -width "-Z gunionname"
156 .It Fl v
168 .Bl -tag -width "-f"
171 .It Fl v
185 .Bl -tag -width "-f"
195 flag may be specified to allow the lower device to be mounted read-only.
196 To prevent a filesystem panic on the mounted lower-device filesystem,
199 operation finishes the lower-device filesystem should be unmounted
201 If the lower-device filesystem is currently being used as the root
211 .It Fl v
218 .Xr geom 8 .
221 .Xr geom 8 .
224 .Xr geom 8 .
227 .Xr geom 8 .
230 Exit status is 0 on success, and 1 if the command fails.
235 as the read-only disk on the bottom and
238 .Bd -literal -offset indent
239 gunion create -v md0 da0p1
240 mount /dev/md0-da0p1.union /mnt
245 .Bd -literal -offset indent
247 gunion commit -v md0-da0p1.union
251 .Bd -literal -offset indent
253 gunion revert -v md0-da0p1.union
257 .Bd -literal -offset indent
259 gunion destroy -v md0-da0p1.union
268 .Pa md0-da0.union
270 .Pa md0-da0p1.union ,
271 .Pa md0-da0p2.union ,
273 A commit operation can be done only on
274 .Pa md0-da0.union
284 .Xr newfs 8 :
285 .Bd -literal -offset indent
287 newfs /dev/md0-da0p1.union
292 .Xr sysctl 8
297 .Bl -tag -width indent
304 If set to 1, all the verbose messages are logged.
305 If set to 2, addition error-related information is logged.
311 .Xr geom 8