198 lines
4.7 KiB
Groff
198 lines
4.7 KiB
Groff
.\" Copyright (c) 2004-2005 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 GCONCAT 8
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.Os
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.Sh NAME
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.Nm gconcat
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.Nd "disk concatenation control utility"
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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 name
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.Ar prov ...
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.Nm
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.Cm destroy
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.Op Fl fv
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.Ar name ...
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.Nm
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.Cm label
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.Op Fl hv
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.Ar name
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.Ar prov ...
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.Nm
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.Cm stop
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.Op Fl fv
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.Ar name ...
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.Nm
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.Cm clear
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.Op Fl v
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.Ar prov ...
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.Nm
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.Cm dump
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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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.Nm
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.Cm load
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.Nm
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.Cm unload
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.Sh DESCRIPTION
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The
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.Nm
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utility is used for device concatenation configuration.
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The concatenation can be configured using two different methods:
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.Dq manual
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or
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.Dq automatic .
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When using the
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.Dq manual
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method, no metadata are stored on the devices, so the concatenated
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device has to be configured by hand every time it is needed.
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The
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.Dq automatic
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method uses on-disk metadata to detect devices.
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Once devices are labeled, they will be automatically detected and
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configured.
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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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Concatenate the given devices with specified
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.Ar name .
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This is the
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.Dq manual
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method.
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The kernel module
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.Pa geom_concat.ko
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will be loaded if it is not loaded already.
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.It Cm label
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Concatenate the given devices with the specified
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.Ar name .
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This is the
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.Dq automatic
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method, where metadata are stored in every device's last sector.
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The kernel module
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.Pa geom_concat.ko
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will be loaded if it is not loaded already.
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.It Cm stop
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Turn off existing concatenate device by its
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.Ar name .
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This command does not touch on-disk metadata!
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.It Cm destroy
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Same as
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.Cm stop .
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.It Cm clear
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Clear metadata on the given devices.
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.It Cm dump
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Dump metadata stored on the given devices.
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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 concatenated device.
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.It Fl h
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Hardcode providers' names in metadata.
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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 CONCAT
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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.concat.debug : No 0
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Debug level of the
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.Nm CONCAT
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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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.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 EXAMPLES
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The following example shows how to configure four disks for automatic
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concatenation, create a file system on it, and mount it:
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.Bd -literal -offset indent
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gconcat label -v data /dev/da0 /dev/da1 /dev/da2 /dev/da3
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newfs /dev/concat/data
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mount /dev/concat/data /mnt
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[...]
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umount /mnt
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gconcat stop data
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gconcat unload
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.Ed
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.Pp
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Configure concatenated provider on one disk only.
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Create file system.
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Add two more disks and extend existing file system.
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.Bd -literal -offset indent
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gconcat label data /dev/da0
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newfs /dev/concat/data
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gconcat label data /dev/da0 /dev/da1 /dev/da2
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growfs /dev/concat/data
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.Ed
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.Sh SEE ALSO
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.Xr geom 4 ,
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.Xr loader.conf 5 ,
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.Xr geom 8 ,
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.Xr growfs 8 ,
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.Xr gvinum 8 ,
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.Xr mount 8 ,
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.Xr newfs 8 ,
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.Xr sysctl 8 ,
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.Xr umount 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 5.3 .
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.Sh AUTHORS
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.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org
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