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107 lines
3.5 KiB
Groff
107 lines
3.5 KiB
Groff
.TH VGCHANGE 8 "LVM TOOLS" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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vgchange \- change attributes of a volume group
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.SH SYNOPSIS
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.B vgchange
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.RB [ \-\-addtag
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.IR Tag ]
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.RB [ \-\-alloc
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.IR AllocationPolicy ]
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.RB [ \-A | \-\-autobackup " {" y | n }]
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.RB [ \-a | \-\-available " [e|l] {" y | n }]
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.RB [ \-d | \-\-debug]
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.RB [ \-\-deltag
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.IR Tag ]
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.RB [ \-h | \-\-help]
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.RB [ \-\-ignorelockingfailure]
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.RB [ \-l | \-\-logicalvolume
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.IR MaxLogicalVolumes ]
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.RB [ \-P | \-\-partial]
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.RB [ \-s | \-\-physicalextentsize
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.IR PhysicalExtentSize [ \fBkKmMgGtT\fR ]]
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.RB [ -t | \-\-test]
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.RB [ \-v | \-\-verbose]
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.RB [ \-\-version ]
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.RB [ \-x | \-\-resizeable " {" y | n }]
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.RI [ VolumeGroupName ...]
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.SH DESCRIPTION
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.B vgchange
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allows you to change the attributes of one or more volume groups.
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Its main purpose is to activate and deactivate
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.IR VolumeGroupName ,
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or all volume groups if none is specified. Only active volume groups
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are subject to changes and allow access to their logical volumes.
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[Not yet implemented: During volume group activation, if
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.B vgchange
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recognizes snapshot logical volumes which were dropped because they ran
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out of space, it displays a message informing the administrator that such
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snapshots should be removed (see
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.BR lvremove (8)).
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]
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.SH OPTIONS
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See \fBlvm\fP for common options.
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.TP
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.BR \-A ", " \-\-autobackup { y | n }
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Controls automatic backup of metadata after the change. See
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.B vgcfgbackup (8).
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Default is yes.
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.TP
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.BR \-a ", " \-\-available [e|l] { y | n }
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Controls the availability of the logical volumes in the volume
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group for input/output.
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In other words, makes the logical volumes known/unknown to the kernel.
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.IP
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If clustered locking is enabled, add 'e' to activate/deactivate
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exclusively on one node or 'l' to activate/deactivate only
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on the local node.
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Logical volumes with single-host snapshots are always activated
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exclusively because they can only be used on one node at once.
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.TP
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.BR \-l ", " \-\-logicalvolume " " \fIMaxLogicalVolumes\fR
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Changes the maximum logical volume number of an existing inactive
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volume group.
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.TP
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.BR \-s ", " \-\-physicalextentsize " " \fIPhysicalExtentSize\fR[\fBkKmMgGtT\fR]
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Changes the physical extent size on physical volumes of this volume group.
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A size suffix (k for kilobytes up to t for terabytes) is optional, megabytes
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is the default if no suffix is present.
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The default is 4 MB and it must be at least 1 KB and a power of 2.
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Before increasing the physical extent size, you might need to use lvresize,
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pvresize and/or pvmove so that everything fits. For example, every
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contiguous range of extents used in a logical volume must start and
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end on an extent boundary.
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If the volume group metadata uses lvm1 format, extents can vary in size from
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8KB to 16GB and there is a limit of 65534 extents in each logical volume. The
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default of 4 MB leads to a maximum logical volume size of around 256GB.
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If the volume group metadata uses lvm2 format those restrictions do not apply,
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but having a large number of extents will slow down the tools but have no
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impact on I/O performance to the logical volume. The smallest PE is 1KB.
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The 2.4 kernel has a limitation of 2TB per block device.
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.TP
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.BR \-x ", " \-\-resizeable { y | n }
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Enables or disables the extension/reduction of this volume group
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with/by physical volumes.
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.SH EXAMPLES
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To activate all known volume groups in the system:
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.nf
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\ vgchange -a y
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.fi
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To change the maximum number of logical volumes of inactive volume group
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.B vg00
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to 128.
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.nf
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\ vgchange -l 128 /dev/vg00
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.fi
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.SH SEE ALSO
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.BR lvchange (8),
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.BR lvm (8),
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.BR vgcreate (8)
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