xref: /freebsd/sbin/geom/core/geom.8 (revision 94db10b2db29f897e4934544a5efeaa704d06aa3)

.\" Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd December 12, 2022
.Dt GEOM 8
.Os
.Sh NAME
.Nm geom
.Nd "universal control utility for GEOM classes"
.Sh SYNOPSIS
.Nm
.Ar class
.Cm help
.Nm
.Ar class
.Cm list
.Op Fl a
.Op Ar name ...
.Nm
.Ar class
.Cm status
.Op Fl ags
.Op Ar name ...
.Nm
.Ar class
.Cm load
.Op Fl v
.Nm
.Ar class
.Cm unload
.Op Fl v
.Nm
.Fl p
.Ar provider-name
.Nm
.Fl t
.Sh DESCRIPTION
The
.Nm
utility is used to control various GEOM classes.
A class has to be aware of
.Nm
communication methods, but there are also some standard commands
which can be used for existing
.Nm
unaware classes.
Here is the list of standard commands:
.Bl -tag -width ".Cm status"
.It Cm help
List all available commands for the given class.
.It Cm list
Print detailed information (within the given class) about all geoms
(if no additional arguments were specified) or the given geoms.
This command is only available if the given class exists in the kernel.
Additional options include:
.Bl -tag -width ".Fl a"
.It Fl a
Print information for geoms without providers.
.El
.It Cm status
Print general information (within the given class) about all geoms
(if no additional arguments were specified) or the given geoms.
This command is only available if the given class exists in the kernel.
.Pp
Additional options include:
.Bl -tag -width ".Fl s"
.It Fl a
When used with -g, print status for geoms without providers.
.It Fl g
Report statuses for geoms instead of providers.
.It Fl s
Produce script-friendly output.
.El
.It Cm load
Load the kernel module that implements the given class.
This command is only available if the class does not yet exist in the kernel and
the file
.Pa geom_ Ns Ao Ar class Ac Ns Pa .ko
can be found in one of the directories specified in
.Va kern.module_path
sysctl.
.It Cm unload
Unload the kernel module which implements the given class.
This command is only available if the given class is loaded as a
kernel module.
.El
.Pp
Additional options include:
.Bl -tag -width ".Cm status"
.It Fl p Ar provider-name
Print detailed information about the geom which provides
.Ar provider-name .
.It Fl t
Display geoms hierarchy as a tree.
.El
.Pp
Class-specific commands are implemented as shared libraries which
are stored in
.Pa /lib/geom/
directory and are loaded via
.Xr dlopen 3
function when the class name is known.
When a class-specific shared library exists, a direct utility should also be
available under the name of
.Nm g Ns Ar class .
.Pp
Currently available classes which are aware of
.Nm :
.Pp
.Bl -bullet -offset indent -compact
.It
CACHE
.It
CONCAT
.It
ELI
.It
JOURNAL
.It
LABEL
.It
MIRROR
.It
MOUNTVER
.It
MULTIPATH
.It
NOP
.It
PART
.It
RAID
.It
RAID3
.It
SCHED
.It
SHSEC
.It
STRIPE
.It
UNION
.It
VINUM (deprecated)
.It
VIRSTOR
.El
.Sh ENVIRONMENT
The following environment variables affect the execution of
.Nm :
.Bl -tag -width ".Ev GEOM_LIBRARY_PATH"
.It Ev GEOM_LIBRARY_PATH
Specifies the path where shared libraries are stored instead of
.Pa /lib/geom/ .
Multiple paths can be specified with a colon-separated list of paths.
.El
.Sh EXIT STATUS
Exit status is 0 on success, and 1 if the command fails.
.Sh EXAMPLES
The following example shows how to set up a stripe on three disks for automatic
configuration:
.Bd -literal -offset indent
geom stripe label -v -s 65536 data /dev/da0 /dev/da1 /dev/da2
or:
gstripe label -v -s 65536 data /dev/da0 /dev/da1 /dev/da2
.Ed
.Pp
Print the list of all providers from the DISK class:
.Bd -literal -offset indent
geom disk list
.Ed
.Pp
Unload a kernel module which implements the MD class:
.Bd -literal -offset indent
geom md unload
.Ed
.Sh SEE ALSO
.Xr libgeom 3 ,
.Xr geom 4 ,
.Xr gcache 8 ,
.Xr gconcat 8 ,
.Xr geli 8 ,
.Xr gjournal 8 ,
.Xr glabel 8 ,
.Xr gmirror 8 ,
.Xr gmountver 8 ,
.Xr gmultipath 8 ,
.Xr gnop 8 ,
.Xr gpart 8 ,
.Xr graid3 8 ,
.Xr gsched 8 ,
.Xr gshsec 8 ,
.Xr gstripe 8 ,
.Xr gunion 8 ,
.Xr gvinum 8 ,
.Xr gvirstor 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 5.3 .
.Sh AUTHORS
.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org