131 lines
3.4 KiB
Groff
131 lines
3.4 KiB
Groff
.\"-
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.\" Copyright (c) 2010 Edward Tomasz Napierala
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 14, 2010
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.Dt GMOUNTVER 8
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.Os
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.Sh NAME
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.Nm gmountver
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.Nd "control utility for disk mount verification GEOM class"
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.Sh SYNOPSIS
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.Nm
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.Cm create
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.Op Fl v
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.Ar dev ...
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.Nm
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.Cm destroy
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.Op Fl fv
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.Ar prov ...
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.Nm
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.Cm list
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.Nm
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.Cm status
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.Op Fl s Ar name
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.Nm
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.Cm load
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.Op Fl v
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.Nm
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.Cm unload
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.Op Fl v
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to control the mount verification GEOM class.
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When configured, it passes all the I/O requests to the underlying provider.
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When the underlying provider disappears - for example because the disk device
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got disconnected - it queues all the I/O requests and waits for the provider
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to reappear.
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When that happens, it attaches to it and sends the queued requests.
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.Pp
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The first argument to
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.Nm
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indicates an action to be performed:
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.Bl -tag -width ".Cm destroy"
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.It Cm create
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Cache the given devices with specified
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.Ar name .
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The kernel module
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.Pa geom_mountver.ko
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will be loaded if it is not loaded already.
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.It Cm destroy
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Destroy
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.Ar name .
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.It Cm list
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See
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.Xr geom 8 .
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.It Cm status
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See
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.Xr geom 8 .
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.It Cm load
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See
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.Xr geom 8 .
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.It Cm unload
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See
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.Xr geom 8 .
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.El
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.Pp
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Additional options:
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.Bl -tag -width indent
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.It Fl f
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Force the removal of the specified mountver device.
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.It Fl v
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Be more verbose.
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.El
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.Sh SYSCTL VARIABLES
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The following
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.Xr sysctl 8
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variables can be used to control the behavior of the
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.Nm MOUNTVER
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GEOM class.
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The default value is shown next to each variable.
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.Bl -tag -width indent
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.It Va kern.geom.mountver.debug : No 0
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Debug level of the
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.Nm MOUNTVER
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GEOM class.
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This can be set to a number between 0 and 3 inclusive.
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If set to 0 minimal debug information is printed, and if set to 3 the
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maximum amount of debug information is printed.
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.It Va kern.geom.mountver.check.check_ident : No 1
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This can be set to 0 or 1.
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If set to 0,
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.Nm
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will reattach to the device even if the device reports a different disk ID.
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.El
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.Sh EXIT STATUS
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Exit status is 0 on success, and 1 if the command fails.
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.Sh SEE ALSO
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.Xr geom 4 ,
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.Xr geom 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 9.0 .
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.Sh AUTHORS
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.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
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