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pvchange: Add --metadataignore description vgchange: Fix minor formatting pvcreate: Update metadataignore description to refer to pvchange lvm.conf: Refer to pvcreate and pvchange for metadata options.
199 lines
7.6 KiB
Groff
199 lines
7.6 KiB
Groff
.TH VGCHANGE 8 "LVM TOOLS #VERSION#" "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 [ \-\-monitor " {" y | n }]
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.RB [ \-\-poll " {" y | n }]
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.RB [ \-c | \-\-clustered " {" y | n }]
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.RB [ \-u | \-\-uuid ]
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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 [ \-\-ignoremonitoring]
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.RB [ \-\-sysinit]
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.RB [ \-\-noudevsync ]
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.RB [ \-l | \-\-logicalvolume
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.IR MaxLogicalVolumes ]
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.RB [ -p | \-\-maxphysicalvolumes
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.IR MaxPhysicalVolumes ]
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.RB [ \-\-[vg]metadatacopies ]
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.IR NumberOfCopies|unmanaged|all ]
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.RB [ \-P | \-\-partial]
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.RB [ \-s | \-\-physicalextentsize
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.IR PhysicalExtentSize [ \fBbBsSkKmMgGtTpPeE\fR ]]
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.RB [ \-\-refresh]
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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 \-c ", " \-\-clustered " " { y | n }
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If clustered locking is enabled, this indicates whether this
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Volume Group is shared with other nodes in the cluster or whether
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it contains only local disks that are not visible on the other nodes.
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If the cluster infrastructure is unavailable on a particular node at a
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particular time, you may still be able to use Volume Groups that
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are not marked as clustered.
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.TP
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.BR \-u ", " \-\-uuid
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Generate new random UUID for specified Volume Groups.
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.TP
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.BR \-\-monitor " " { y | n }
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Start or stop monitoring a mirrored or snapshot logical volume with
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dmeventd, if it is installed.
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If a device used by a monitored mirror reports an I/O error,
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the failure is handled according to
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.BR mirror_image_fault_policy
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and
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.BR mirror_log_fault_policy
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set in
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.BR lvm.conf (5).
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.TP
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.BR \-\-poll " " { y | n }
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Without polling a logical volume's backgrounded transformation process
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will never complete. If there is an incomplete pvmove or lvconvert (for
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example, on rebooting after a crash), use \fB--poll y\fP to restart the
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process from its last checkpoint. However, it may not be appropriate to
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immediately poll a logical volume when it is activated, use \fB--poll
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n\fP to defer and then \fB--poll y\fP to restart the process.
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.TP
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.BR \-\-sysinit
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Indicates that vgchange(8) is being invoked from early system initialisation
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scripts (e.g. rc.sysinit or an initrd), before writeable filesystems are
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available. As such, some functionality needs to be disabled and this option
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acts as a shortcut which selects an appropriate set of options. Currently
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this is equivalent to using \fB--ignorelockingfailure\fP, \fB--ignoremonitoring\fP,
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\fB--poll n\fP and setting \fBLVM_SUPPRESS_LOCKING_FAILURE_MESSAGES\fP
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environment variable.
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.TP
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.BR \-\-noudevsync
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Disable udev synchronisation. The
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process will not wait for notification from udev.
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It will continue irrespective of any possible udev processing
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in the background. You should only use this if udev is not running
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or has rules that ignore the devices LVM2 creates.
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.TP
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.BR \-\-ignoremonitoring
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Make no attempt to interact with dmeventd unless
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.BR \-\-monitor
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is specified.
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Do not use this if dmeventd is already monitoring a device.
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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 \-p ", " \-\-maxphysicalvolumes " " \fIMaxPhysicalVolumes\fR
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Changes the maximum number of physical volumes that can belong
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to this volume group.
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For volume groups with metadata in lvm1 format, the limit is 255.
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If the metadata uses lvm2 format, the value 0 removes this restriction:
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there is then no limit. If you have a large number of physical volumes in
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a volume group with metadata in lvm2 format, for tool performance reasons,
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you should consider some use of \fB--pvmetadatacopies 0\fP as described in
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\fBpvcreate(8)\fP, and/or use \fB--vgmetadatacopies\fP.
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.TP
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.BR \-\-[vg]metadatacopies " " \fINumberOfCopies|unmanaged|all\fP
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Sets the desired number of metadata copies in the volume group. If set to
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a non-zero value, LVM will automatically manage the 'metadataignore'
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flags on the physical volumes (see \fBpvchange\fP or \fBpvcreate --metadataignore\fP) in order
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to achieve \fINumberOfCopies\fP copies of metadata. If set to \fIunmanaged\fP,
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LVM will not automatically manage the 'metadataignore' flags. If set to
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\fIall\fP, LVM will first clear all of the 'metadataignore' flags on all
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metadata areas in the volume group, then set the value to \fIunmanaged\fP.
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The \fBvgmetadatacopies\fP option is useful for volume groups containing
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large numbers of physical volumes with metadata as it may be used to
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minimize metadata read and write overhead.
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.TP
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.BR \-s ", " \-\-physicalextentsize " " \fIPhysicalExtentSize\fR[\fBbBsSkKmMgGtTpPeE\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 \-\-refresh
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If any logical volume in the volume group is active, reload its metadata.
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This is not necessary in normal operation, but may be useful
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if something has gone wrong or if you're doing clustering
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manually without a clustered lock manager.
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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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