VGCHANGE(8)VGCHANGE(8)NAMEvgchange - change attributes of a volume group
SYNOPSISvgchange [--addtag Tag] [--alloc AllocationPolicy] [-A|--autobackup
{y|n}] [-a|--activate [a|e|l] {y|n}] [--monitor {y|n}] [--poll {y|n}]
[-c|--clustered {y|n}] [-u|--uuid] [-d|--debug] [--deltag Tag]
[-h|--help] [--ignorelockingfailure] [--ignoremonitoring] [--sysinit]
[--noudevsync] [-l|--logicalvolume MaxLogicalVolumes] [-p|--maxphysi‐
calvolumes MaxPhysicalVolumes] [--[vg]metadatacopies] NumberOf‐
Copies|unmanaged|all] [-P|--partial] [-s|--physicalextentsize Physi‐
calExtentSize[bBsSkKmMgGtTpPeE]] [--refresh] [-t|--test] [-v|--verbose]
[--version] [-x|--resizeable {y|n}] [VolumeGroupName...]
DESCRIPTIONvgchange 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|l]{y|n}
Controls the availability of the logical volumes in the volume
group for input/output. In other words, makes the logical vol‐
umes known/unknown to the kernel. If autoactivation option is
used (-aay), each logical volume in the volume group is acti‐
vated only if it matches an item in the activation/auto_activa‐
tion_volume_list set in lvm.conf. Autoactivation is not yet
supported for partial or clustered volume groups.
If clustered locking is enabled, add 'e' to activate/deactivate
exclusively on one node or 'l' to activate/deactivate only on
the local node. Logical volumes with single-host snapshots are
always activated exclusively because they can only be used on
one node at once.
-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.
-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 moni‐
tored mirror reports an I/O error, the failure is handled
according to mirror_image_fault_policy and mirror_log_fault_pol‐
icy 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. How‐
ever, 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.
--sysinit
Indicates that vgchange(8) is being invoked from early system
initialisation scripts (e.g. rc.sysinit or an initrd), before
writeable filesystems are available. As such, some functionality
needs to be disabled and this option acts as a shortcut which
selects an appropriate set of options. Currently this is equiva‐
lent to using --ignorelockingfailure, --ignoremonitoring, --poll
n and setting LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES environment
variable.
If --sysinit is used in conjunction with lvmetad(8) enabled and
running, autoactivation is preferred over manual activation via
direct vgchange call. Logical volumes are autoactivated accord‐
ing to auto_activation_volume_list set in lvm.conf(5).
--noudevsync
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.
-l, --logicalvolume MaxLogicalVolumes
Changes the maximum logical volume number of an existing inac‐
tive 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.
--[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 automati‐
cally manage the 'metadataignore' flags. If set to all, LVM
will first clear all of the 'metadataignore' flags on all meta‐
data areas in the volume group, then set the value to unmanaged.
The vgmetadatacopies option is useful for volume groups contain‐
ing 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 kilobytes up to t for ter‐
abytes) is optional, megabytes is the default if no suffix is
present. The default is 4 MiB and it must be at least 1 KiB and
a power of 2.
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.
If the volume group metadata uses lvm1 format, extents can vary
in size from 8KiB to 16GiB and there is a limit of 65534 extents
in each logical volume. The default of 4 MiB leads to a maximum
logical volume size of around 256GiB.
If the volume group metadata uses lvm2 format those restrictions
do not apply, but having a large number of extents will slow
down the tools but have no impact on I/O performance to the log‐
ical volume. The smallest PE is 1KiB.
The 2.4 kernel has a limitation of 2TiB per block device.
--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 ALSOlvchange(8), lvm(8), vgcreate(8)Sistina Software UK LVM TOOLS 2.02.98(2) (2012-10-15) VGCHANGE(8)
