2004-05-21 22:12:24 +00:00
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.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 AUTHORS 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 AUTHORS 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 May 21, 2004
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.Dt GNOP 8
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.Os
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.Sh NAME
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.Nm gnop
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.Nd "control utility for NOP 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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.Op Fl f Ar failprob
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.Ar dev1
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.Op Ar dev2 Op Ar ...
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.Nm
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.Cm configure
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.Op Fl v
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.Op Fl f Ar failprob
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2004-05-22 10:53:06 +00:00
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.Ar prov1
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.Op Ar prov2 Op Ar ...
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2004-05-21 22:12:24 +00:00
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.Nm
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.Cm destroy
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.Op Fl fv
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2004-05-22 10:53:06 +00:00
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.Ar prov1
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.Op Ar prov2 Op Ar ...
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2004-05-21 22:12:24 +00:00
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.Nm
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.Cm list
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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 for setting up transparent providers on existing ones.
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Its main purpose is testing other GEOM classes, as it allows force providers
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removal and I/O errors symulation with a given probability.
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It is also a good starting point for implementing new GEOM classes.
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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 configure"
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.It Cm create
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Setup a transparent provider on the given devices.
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If operation succeded, new provider should appear with name
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.Pa /dev/<dev>.nop .
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The kernel module
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.Pa geom_nop.ko
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will be loaded if it is not loaded already.
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.It Cm configure
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Configure existing transparent provider. At the moment it is only used
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for changing failure probability.
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The kernel module
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.Pa geom_nop.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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2004-05-22 10:53:06 +00:00
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Turn off the given transparent providers.
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2004-05-21 22:12:24 +00:00
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.It Cm list
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List currently configured providers.
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.It Cm load
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Load
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.Pa geom_nop.ko
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kernel module.
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.It Cm unload
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Unload
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.Pa geom_nop.ko
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kernel module.
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.El
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.Pp
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Additional options:
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.Bl -tag -width ".Fl f Ar failprob"
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.It Fl f
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Force the removal of the specified striped device.
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.It Fl f Ar failprob
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Specifies failure probability in percentage.
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.It Fl v
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Be more verbose.
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.El
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.Sh EXAMPLES
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The following example shows how to create transparent provider for disk
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.Pa /dev/da0
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with 50% failure probability and destroy it.
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2004-05-21 22:12:24 +00:00
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.Bd -literal -offset indent
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2004-05-22 10:53:06 +00:00
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gnop create -v -f 50 da0
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gnop destroy -v da0.nop
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2004-05-21 22:12:24 +00:00
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.Ed
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.Sh DIAGNOSTICS
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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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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 5.3 .
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.Sh AUTHORS
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.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org
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