VGCHANGE(8) System Manager's Manual VGCHANGE(8)
NAME
vgchange — change attributes of a volume group
SYNOPSIS
vgchange [--addtag Tag] [--alloc AllocationPolicy] [-A|--autobackup {y|n}] [-a|--activate [a|e|s|l] {y|n}]
[--activationmode {complete|degraded|partial}] [-K|--ignoreactivationskip] [--monitor {y|n}] [--poll {y|n}]
[-c|--clustered {y|n}] [-u|--uuid] [--commandprofile ProfileName] [-d|--debug] [--deltag Tag] [--detachpro‐
file] [-h|--help] [--ignorelockingfailure] [--ignoremonitoring] [--ignoreskippedcluster] [--sysinit] [--noude‐
vsync] [--lock-start] [--lock-stop] [--lock-type LockType] [-l|--logicalvolume MaxLogicalVolumes] [-p|--max‐
physicalvolumes MaxPhysicalVolumes] [--metadataprofile ProfileName] [--[vg]metadatacopies NumberOf‐
Copies|unmanaged|all] [-P|--partial] [-s|--physicalextentsize PhysicalExtentSize[bBsSkKmMgGtTpPeE]] [--report‐
format {basic|json}] [-S|--select Selection] [--systemid SystemID] [--refresh] [-t|--test] [-v|--verbose]
[--version] [-x|--resizeable {y|n}] [VolumeGroupName...]
DESCRIPTION
vgchange allows you to change the attributes of one or more volume groups. Its main purpose is to activate and
deactivate VolumeGroupName, or all volume groups if none is specified. Only active volume groups are subject
to changes and allow access to their logical volumes. [Not yet implemented: During volume group activation,
if vgchange recognizes snapshot logical volumes which were dropped because they ran out of space, it displays
a message informing the administrator that such snapshots should be removed (see lvremove(8)). ]
OPTIONS
See lvm(8) for common options.
-A, --autobackup {y|n}
Controls automatic backup of metadata after the change. See vgcfgbackup(8). Default is yes.
-a, --activate [a|e|s|l]{y|n}
Controls the availability of the logical volumes in the volume group for input/output. In other words,
makes the logical volumes known/unknown to the kernel. If autoactivation option is used (-aay), each
logical volume in the volume group is activated only if it matches an item in the activation/auto_acti‐
vation_volume_list set in lvm.conf. If this list is not set, then all volumes are considered for acti‐
vation. The -aay option should be also used during system boot so it's possible to select which vol‐
umes to activate using the activation/auto_activation_volume_list settting.
Activation of a logical volume creates a symbolic link /dev/VolumeGroupName/LogicalVolumeName pointing
to the device node. This link is removed on deactivation. All software and scripts should access the
device through this symbolic link and present this as the name of the device. The location and name of
the underlying device node may depend on the distribution and configuration (e.g. udev) and might
change from release to release.
In a clustered VG, clvmd is used for activation, and the following options are possible:
With -aey, clvmd activates the LV in exclusive mode (with an exclusive lock), allowing a single node to
activate the LV.
With -asy, clvmd activates the LV in shared mode (with a shared lock), allowing multiple nodes to acti‐
vate the LV concurrently. If the LV type prohibits shared access, such as an LV with a snapshot, the
's' option is ignored and an exclusive lock is used.
With -ay (no mode specified), clvmd activates the LV in shared mode if the LV type allows concurrent
access, such as a linear LV. Otherwise, clvmd activates the LV in exclusive mode.
With -aey, -asy, and -ay, clvmd attempts to activate the LV on all nodes. If exclusive mode is used,
then only one of the nodes will be successful.
With -aey, the command activates the LV in exclusive mode, allowing a single host to activate the LV
(the host running the command). Before activating the LV, the command uses lvmlockd to acquire an
exclusive lock on the LV. If the lock cannot be acquired, the LV is not activated and an error is
reported. This would happen if the LV is active on another host.
With -asy, the command activates the LV in shared mode, allowing multiple hosts to activate the LV con‐
currently. Before activating the LV, the command uses lvmlockd to acquire a shared lock on the LV. If
the lock cannot be acquired, the LV is not activated and an error is reported. This would happen if
the LV is active exclusively on another host. If the LV type prohibits shared access, such as a snap‐
shot, the command will report an error and fail.
With -an, the command deactivates the LV on the host running the command. After deactivating the LV,
the command uses lvmlockd to release the current lock on the LV.
With lvmlockd, an unspecified mode is always exclusive, -ay defaults to -aey.
--activationmode {complete|degraded|partial}
The activation mode determines whether logical volumes are allowed to activate when there are physical
volumes missing (e.g. due to a device failure). complete is the most restrictive; allowing only those
logical volumes to be activated that are not affected by the missing PVs. degraded allows RAID logical
volumes to be activated even if they have PVs missing. (Note that the "mirror" segment type is not
considered a RAID logical volume. The "raid1" segment type should be used instead.) Finally, partial
allows any logical volume to be activated even if portions are missing due to a missing or failed PV.
This last option should only be used when performing recovery or repair operations. degraded is the
default mode. To change it, modify activation_mode in lvm.conf(5).
-K, --ignoreactivationskip
Ignore the flag to skip Logical Volumes during activation.
-c, --clustered {y|n}
If clustered locking is enabled, this indicates whether this Volume Group is shared with other nodes in
the cluster or whether it contains only local disks that are not visible on the other nodes. If the
cluster infrastructure is unavailable on a particular node at a particular time, you may still be able
to use Volume Groups that are not marked as clustered.
--detachprofile
Detach any metadata configuration profiles attached to given Volume Groups. See lvm.conf(5) for more
information about metadata profiles.
-u, --uuid
Generate new random UUID for specified Volume Groups.
--monitor {y|n}
Start or stop monitoring a mirrored or snapshot logical volume with dmeventd, if it is installed. If a
device used by a monitored mirror reports an I/O error, the failure is handled according to mir‐
ror_image_fault_policy and mirror_log_fault_policy set in lvm.conf(5).
--poll {y|n}
Without polling a logical volume's backgrounded transformation process will never complete. If there
is an incomplete pvmove or lvconvert (for example, on rebooting after a crash), use --poll y to restart
the process from its last checkpoint. However, it may not be appropriate to immediately poll a logical
volume when it is activated, use --poll n to defer and then --poll y to restart the process.
Disable udev synchronisation. The process will not wait for notification from udev. It will continue
irrespective of any possible udev processing in the background. You should only use this if udev is
not running or has rules that ignore the devices LVM2 creates.
--ignoremonitoring
Make no attempt to interact with dmeventd unless --monitor is specified. Do not use this if dmeventd
is already monitoring a device.
--lock-start
Start the lockspace of a shared VG in lvmlockd. lvmlockd locks becomes available for the VG, allowing
LVM to use the VG. See lvmlockd(8).
--lock-stop
Stop the lockspace of a shared VG in lvmlockd. lvmlockd locks become unavailable for the VG, prevent‐
ing LVM from using the VG. See lvmlockd(8).
--lock-type LockType
Change the VG lock type to or from a shared lock type used with lvmlockd. See lvmlockd(8).
-l, --logicalvolume MaxLogicalVolumes
Changes the maximum logical volume number of an existing inactive volume group.
-p, --maxphysicalvolumes MaxPhysicalVolumes
Changes the maximum number of physical volumes that can belong to this volume group. For volume groups
with metadata in lvm1 format, the limit is 255. If the metadata uses lvm2 format, the value 0 removes
this restriction: there is then no limit. If you have a large number of physical volumes in a volume
group with metadata in lvm2 format, for tool performance reasons, you should consider some use of
--pvmetadatacopies 0 as described in pvcreate(8), and/or use --vgmetadatacopies.
--metadataprofile ProfileName
Uses and attaches ProfileName configuration profile to the volume group metadata. Whenever the volume
group is processed next time, the profile is automatically applied. The profile is inherited by all
logical volumes in the volume group unless the logical volume itself has its own profile attached. See
lvm.conf(5) for more information about metadata profiles.
--[vg]metadatacopies NumberOfCopies|unmanaged|all
Sets the desired number of metadata copies in the volume group. If set to a non-zero value, LVM will
automatically manage the 'metadataignore' flags on the physical volumes (see pvchange or pvcreate
--metadataignore) in order to achieve NumberOfCopies copies of metadata. If set to unmanaged, LVM will
not automatically manage the 'metadataignore' flags. If set to all, LVM will first clear all of the
'metadataignore' flags on all metadata areas in the volume group, then set the value to unmanaged. The
vgmetadatacopies option is useful for volume groups containing large numbers of physical volumes with
metadata as it may be used to minimize metadata read and write overhead.
-s, --physicalextentsize PhysicalExtentSize[BbBsSkKmMgGtTpPeE]
Changes the physical extent size on physical volumes of this volume group. A size suffix (k for kilo‐
bytes up to t for terabytes) is optional, megabytes is the default if no suffix is present. For LVM2
format, the value must be a power of 2 of at least 1 sector (where the sector size is the largest sec‐
tor size of the PVs currently used in the VG) or, if not a power of 2, at least 128KiB. For the older
LVM1 format, it must be a power of 2 of at least 8KiB. The default is 4 MiB.
Before increasing the physical extent size, you might need to use lvresize, pvresize and/or pvmove so
that everything fits. For example, every contiguous range of extents used in a logical volume must
start and end on an extent boundary.
Changes the system ID of the VG. Using this option requires caution because the VG may become foreign
to the host running the command, leaving the host unable to access it. See lvmsystemid(7).
--refresh
If any logical volume in the volume group is active, reload its metadata. This is not necessary in
normal operation, but may be useful if something has gone wrong or if you're doing clustering manually
without a clustered lock manager.
-x, --resizeable {y|n}
Enables or disables the extension/reduction of this volume group with/by physical volumes.
Examples
To activate all known volume groups in the system:
vgchange -a y
To change the maximum number of logical volumes of inactive volume group vg00 to 128.
vgchange -l 128 /dev/vg00
SEE ALSO
lvchange(8), lvm(8), vgcreate(8)
Sistina Software UK LVM TOOLS 2.02.166(2)-RHEL7 (2016-11-16) VGCHANGE(8)
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