444 lines
13 KiB
Groff
444 lines
13 KiB
Groff
.\" Copyright (c) 2005 Chris Jones
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project by Chris Jones
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.\" thanks to the support of Google's Summer of Code program and
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.\" mentoring by Lukas Ertl.
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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 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 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 April 10, 2009
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.Dt GVINUM 8
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.Os
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.Sh NAME
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.Nm gvinum
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.Nd Logical Volume Manager control program
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.Sh SYNOPSIS
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.Nm
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.Op Ar command
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.Op Fl options
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.Sh COMMANDS
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.Bl -tag -width indent
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.It Ic attach Ar plex volume Op Cm rename
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.It Ic attach Ar subdisk plex Oo Ar offset Oc Op Cm rename
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Attach a plex to a volume, or a subdisk to a plex.
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If offset is specified, the subdisk will be attached to the given offset within
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the plex.
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If rename is specified, the subdisk or plex will change name according to the
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object it attaches to.
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.It Ic checkparity Oo Fl f Oc Ar plex
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Check the parity blocks of a RAID-5 plex.
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The parity check will start at the
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beginning of the plex if the
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.Fl f
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flag is specified, or otherwise at the location of the parity check pointer,
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the first location at which plex's parity is incorrect.
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All subdisks in the
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plex must be up for a parity check.
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.It Ic concat Oo Fl fv Oc Oo Fl n Ar name Oc Ar drives
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Create a concatenated volume from the specified drives.
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If no name is specified, a unique name will be set by
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.Ic gvinum .
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.It Ic create Oo Fl f Oc Op Ar description-file
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Create a volume as described in
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.Ar description-file .
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If no
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.Ar description-file
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provided, opens an editor and provides the current
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.Nm
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configuration for editing.
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The
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.Fl f
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flag will make gvinum ignore any errors regarding creating objects that already
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exists.
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However, in contrast to vinum, objects that are not properly named in the
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.Ar description-file
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will not be created when the
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.Fl f
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flag is given.
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.It Ic detach Oo Fl f Oc Op Ar plex | subdisk
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Detach a plex or subdisk from the volume or plex to which it is
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attached.
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.It Ic grow Ar plex device
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Grow a plex by creating a gvinum drive and subdisk on device and attach it to
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the plex.
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If required by the plex organization, it will be put into the growable state.
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.It Ic help
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Provides a synopsis of
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.Nm
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commands and arguments.
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.It Ic l | list Oo Fl rvV Oc Op Ar volume | plex | subdisk
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.It Ic ld Oo Fl rvV Oc Op Ar drive ...
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.It Ic ls Oo Fl rvV Oc Op Ar subdisk ...
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.It Ic lp Oo Fl rvV Oc Op Ar plex ...
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.It Ic lv Oo Fl rvV Oc Op Ar volume ...
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List information about the relevant object(s).
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The
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.Fl r
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flag provides recursive display, showing each object's subordinate objects in
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proper relation.
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The
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.Fl v
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and
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.Fl V
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flags provide progressively more detailed output.
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.It Ic mirror Oo Fl fsv Oc Oo Fl n Ar name Oc Ar drives
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Create a mirrored volume from the specified drives.
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It requires at least a multiple of 2 drives.
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If no name is specified, a unique name will be set by gvinum.
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If the
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.Fl s
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flag is specified, a striped mirror will be created, and thus requires a
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multiple of 4 drives.
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.It Ic move | mv Fl f Ar drive subdisk Op Ar ...
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Move the subdisk(s) to the specified drive.
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The
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.Fl f
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flag is required, as all data on the indicated subdisk(s) will be destroyed as
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part of the move.
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This can currently only be done when the subdisk is
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not being accessed.
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.Pp
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If a single subdisk is moved, and it forms a part of a RAID-5 plex, the moved
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subdisks will need to be set to the
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.Dq stale
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state, and the plex will require a
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.Ic start
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command.
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If multiple subdisk(s) is moved, and form part of a RAID-5 plex, the
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moved disk(s) will need to be set to the
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.Dq up
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state and the plex will require a
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.Ic rebuildparity
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command.
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If the subdisk(s) form part of a plex that is mirrored with other
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plexes, the plex will require restarting and will sync once restarted.
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Moving
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more than one subdisk in a RAID-5 plex or subdisks from both sides of a
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mirrored plex volume will destroy data.
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Note that parity rebuilds and syncing
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must be started manually after a move.
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.It Ic printconfig
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Write a copy of the current configuration to standard output.
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.It Ic quit
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Exit
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.Nm
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when running in interactive mode.
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Normally this would be done by entering the
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EOF character.
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.It Ic raid5 Oo Fl fv Oc Oo Fl s Ar stripesize Oc Oo Fl n Ar name Oc Ar drives
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Create a RAID-5 volume from the specified drives.
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If no name is specified, a unique name will be set by
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.Ic gvinum .
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This organization requires at least three drives.
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.It Ic rename Oo Fl r Oc Ar drive | subdisk | plex | volume newname
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Change the name of the specified object.
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The
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.Fl r
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flag will recursively rename subordinate objects.
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.Pp
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Note that device nodes will not be renamed until
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.Nm
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is restarted.
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.It Ic rebuildparity Oo Fl f Oc Ar plex
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Rebuild the parity blocks of a RAID-5 plex.
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The parity rebuild will start at
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the beginning of the plex if the
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.Fl f
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flag is specified, or otherwise at the location of the parity check pointer.
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All subdisks in the plex must be up for a parity check.
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.It Ic resetconfig
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Reset the complete
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.Nm
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configuration.
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.It Ic rm Oo Fl r Oc Ar volume | plex | subdisk
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Remove an object and, if
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.Fl r
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is specified, its subordinate objects.
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.It Ic saveconfig
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Save
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.Nm
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configuration to disk after configuration failures.
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.It Ic setstate Oo Fl f Oc Ar state volume | plex | subdisk | drive
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Set state without influencing other objects, for diagnostic purposes
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only.
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The
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.Fl f
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flag forces state changes regardless of whether they are legal.
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.It Ic start
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Read configuration from all vinum drives.
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.It Ic start Oo Fl S Ar size Oc Ar volume | plex | subdisk
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Allow the system to access the objects.
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If necessary, plexes will be synced and rebuilt.
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If a subdisk was added to a running RAID-5 or striped plex, gvinum will
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expand into this subdisk and grow the whole RAID-5 array.
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This can be done without unmounting your filesystem.
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The
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.Fl S
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flag is currently ignored.
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.It Ic stop Oo Fl f Oc Op Ar volume | plex | subdisk
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Terminate access to the objects, or stop
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.Nm
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if no parameters are specified.
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.It Ic stripe Oo Fl fv Oc Oo Fl n Ar name Oc Ar drives
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Create a striped volume from the specified drives. If no name is specified,
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a unique name will be set by
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.Ic gvinum .
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This organization requires at least two drives.
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.El
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.Sh DESCRIPTION
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The
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.Nm
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utility communicates with the kernel component of the GVinum logical volume
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manager.
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It is designed either for interactive use, when started without
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command line arguments, or to execute a single command if the command is
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supplied on the command line.
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In interactive mode,
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.Nm
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maintains a command line history.
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.Sh OPTIONS
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The
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.Nm
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commands may be followed by an option.
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.Bl -tag -width indent
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.It Fl f
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The
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.Fl f
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.Pq Dq force
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option overrides safety checks.
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It should be used with extreme caution.
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This
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option is required in order to use the
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.Ic move
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command.
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.It Fl r
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The
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.Fl r
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.Pq Dq recursive
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option applies the command recursively to subordinate objects.
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For example, in
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conjunction with the
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.Ic lv
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command, the
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.Fl r
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option will also show information about the plexes and subdisks belonging to
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the volume.
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It is also used by the
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.Ic rename
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command to indicate that subordinate objects such as subdisks should be renamed
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to match the object(s) specified and by the
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.Ic rm
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command to delete plexes belonging to a volume and so on.
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.It Fl v
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The
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.Fl v
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.Pq Dq verbose
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option provides more detailed output.
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.It Fl V
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The
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.Fl V
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.Pq Dq "very verbose"
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option provides even more detailed output than
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.Fl v .
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width ".Ev EDITOR"
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.It Ev EDITOR
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The name of the editor to use for editing configuration files, by
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default
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.Xr vi 1
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is invoked.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /dev/gvinum/plex"
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.It Pa /dev/gvinum
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directory with device nodes for
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.Nm
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objects
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.El
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.Sh EXAMPLES
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To create a mirror on disks /dev/ad1 and /dev/ad2, create a filesystem, mount,
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unmount and then stop
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.Ic gvinum :
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.Pp
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.Dl "gvinum mirror /dev/ad1 /dev/ad2"
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.Dl "newfs /dev/gvinum/gvinumvolume0"
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.Dl "mount /dev/gvinum/gvinumvolume0 /mnt"
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.Dl "..."
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.Dl "unmount /mnt"
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.Dl "gvinum stop"
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.Pp
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To create a striped mirror on disks /dev/ad1 /dev/ad2 /dev/ad3 and /dev/ad4
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named "data" and create a filesystem:
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.Pp
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.Dl "gvinum mirror -s -n data /dev/ad1 /dev/ad2 /dev/ad3 /dev/ad4"
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.Dl "newfs /dev/gvinum/data"
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.Pp
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To create a raid5 array on disks /dev/ad1 /dev/ad2 and /dev/ad3, with stripesize
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493k you can use the raid5 command:
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.Pp
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.Dl "gvinum raid5 -s 493k /dev/ad1 /dev/ad2 /dev/ad3"
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.Pp
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Then the volume will be created automatically.
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Afterwards, you have to initialize the volume:
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.Pp
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.Dl "gvinum start myraid5vol"
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.Pp
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The initialization will start, and the states will be updated when it's
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finished.
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The list command will give you information about its progress.
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.Pp
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Imagine that one of the drives fails, and the output of 'printconfig' looks
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something like this:
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.Pp
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.Dl "drive gvinumdrive1 device /dev/ad2"
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.Dl "drive gvinumdrive2 device /dev/???"
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.Dl "drive gvinumdrive0 device /dev/ad1"
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.Dl "volume myraid5vol"
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.Dl "plex name myraid5vol.p0 org raid5 986s vol myraid5vol"
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.Dl "sd name myraid5vol.p0.s2 drive gvinumdrive2 len 32538s driveoffset 265s"
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.Dl "plex myraid5vol.p0 plexoffset 1972s"
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.Dl "sd name myraid5vol.p0.s1 drive gvinumdrive1 len 32538s driveoffset 265s"
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.Dl "plex myraid5vol.p0 plexoffset 986s"
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.Dl "sd name myraid5vol.p0.s0 drive gvinumdrive0 len 32538s driveoffset 265s"
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.Dl "plex myraid5vol.p0 plexoffset 0s"
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.Pp
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Create a new drive with this configuration:
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.Pp
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.Dl "drive gdrive4 device /dev/ad4"
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.Pp
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Then move the stale subdisk to the new drive:
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.Pp
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.Dl "gvinum move gdrive4 myraid5vol.p0.s2"
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.Pp
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Then, initiate the rebuild:
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.Pp
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.Dl "gvinum start myraid5vol.p0"
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.Pp
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The plex will go up form degraded mode after the rebuild is finished.
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The plex can still be used while the rebuild is in progress, although requests
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might be delayed.
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.Pp
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Given the configuration as in the previous example, growing a RAID-5 or STRIPED
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array is accomplished by using the grow command:
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.Pp
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.Dl "gvinum grow myraid5vol.p0 /dev/ad4"
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.Pp
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If everything went ok, the plex state should now be set to growable.
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You can then start the growing with the
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.Ic start
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command:
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.Pp
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.Dl "gvinum start myraid5vol.p0"
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.Pp
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As with rebuilding, you can watch the progress using the
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.Ic list
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command.
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.Pp
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For a more advanced usage and detailed explanation of gvinum, the
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handbook is recommended.
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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 first appeared in
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.Fx 5.3 .
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The
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.Nm vinum
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utility, on which
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.Nm
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is based, was written by
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.An "Greg Lehey" .
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.Pp
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The
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.Nm
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utility
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was written by
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.An "Lukas Ertl" .
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The
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.Ic move
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and
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.Ic rename
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commands and
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documentation were added by
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.An "Chris Jones"
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through the 2005 Google Summer
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of Code program.
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.Ic a partial rewrite of gvinum was done by "Lukas Ertl" and "Ulf Lilleengen"
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through the 2007 Google Summer of Code program.
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The documentation have been updated to reflect the new functionality.
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.Sh AUTHORS
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.An Lukas Ertl Aq le@FreeBSD.org
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.An Chris Jones Aq soc-cjones@FreeBSD.org
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.An Ulf Lilleengen Aq lulf@FreeBSD.org
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.Sh BUGS
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Currently,
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.Nm
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does not rename devices in
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.Pa /dev/gvinum
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until reloaded.
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.Pp
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The
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.Fl S
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initsize flag to
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.Ic start
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is ignored.
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.Pp
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Moving subdisks that are not part of a mirrored or RAID-5 volume will
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destroy data.
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It is perhaps a bug to permit this.
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.Pp
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Plexes in which subdisks have been moved do not automatically sync or
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rebuild parity.
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This may leave data unprotected and is perhaps unwise.
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.Pp
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Currently,
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.Nm
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does not yet fully implement all of the functions found in
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.Xr vinum 4 .
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Specifically, the following commands from
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.Xr vinum 4
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are not supported:
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.Bl -tag -width indent
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.It Ic debug
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Cause the volume manager to enter the kernel debugger.
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.It Ic debug Ar flags
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Set debugging flags.
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.It Ic dumpconfig Op Ar drive ...
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List the configuration information stored on the specified drives, or all
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drives in the system if no drive names are specified.
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.It Ic info Op Fl vV
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List information about volume manager state.
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.It Ic label Ar volume
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Create a volume label.
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.It Ic resetstats Oo Fl r Oc Op Ar volume | plex | subdisk
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Reset statistics counters for the specified objects, or for all objects if none
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are specified.
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.It Ic setdaemon Op Ar value
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Set daemon configuration.
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.El
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