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NetBSD 6.1.5 - man page for vgchange (netbsd section 8)

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VGCHANGE(8)									      VGCHANGE(8)

NAME
       vgchange - change attributes of a volume group

SYNOPSIS
       vgchange [--addtag Tag] [--alloc AllocationPolicy] [-A|--autobackup {y|n}] [-a|--available
       [e|l] {y|n}] [--monitor {y|n}] [-c|--clustered {y|n}] [-u|--uuid]  [-d|--debug]	[--deltag
       Tag] [-h|--help] [--ignorelockingfailure] [--ignoremonitoring] [-l|--logicalvolume MaxLog-
       icalVolumes] [-p|--maxphysicalvolumes MaxPhysicalVolumes] [-P|--partial] [-s|--physicalex-
       tentsize     PhysicalExtentSize[kKmMgGtT]]    [-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  pur-
       pose is to activate and deactivate VolumeGroupName, or all volume groups if none is speci-
       fied.  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 lvre-
       move(8)).  ]

OPTIONS
       See lvm for common options.

       -A, --autobackup {y|n}
	      Controls automatic backup of metadata  after  the  change.   See	vgcfgbackup  (8).
	      Default is yes.

       -a, --available [e|l]{y|n}
	      Controls the availability of the logical volumes in the volume group for input/out-
	      put.  In other words, makes the logical volumes known/unknown to the kernel.

	      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}
	      Controls	whether  or not a mirrored logical volume is monitored by dmeventd, if it
	      is installed.  If a device used by a monitored 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).

       --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 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 meta-
	      data  in lvm2 format, for tool performance reasons, you should consider some use of
	      --metadatacopies 0 as described in pvcreate(8).

       -s, --physicalextentsize PhysicalExtentSize[kKmMgGtT]
	      Changes the physical extent size on physical volumes of this volume group.  A  size
	      suffix  (k  for  kilobytes  up  to  t  for terabytes) is optional, megabytes is the
	      default if no suffix is present.	The default is 4 MB and it must be at least 1  KB
	      and a power of 2.

	      Before  increasing  the physical extent size, you might need to use lvresize, pvre-
	      size 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 8KB to
	      16GB and there is a limit of 65534 extents in each logical volume.  The default  of
	      4 MB leads to a maximum logical volume size of around 256GB.

	      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 logical volume.  The smallest PE is 1KB.

	      The 2.4 kernel has a limitation of 2TB per block device.

       -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 2.02.44-cvs (02-17-09)		      VGCHANGE(8)
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