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Currently, we have two modes of activation, an unnamed nominal mode
(which I will refer to as "complete") and "partial" mode. The
"complete" mode requires that a volume group be 'complete' - that
is, no missing PVs. If there are any missing PVs, no affected LVs
are allowed to activate - even RAID LVs which might be able to
tolerate a failure. The "partial" mode allows anything to be
activated (or at least attempted). If a non-redundant LV is
missing a portion of its addressable space due to a device failure,
it will be replaced with an error target. RAID LVs will either
activate or fail to activate depending on how badly their
redundancy is compromised.
This patch adds a third option, "degraded" mode. This mode can
be selected via the '--activationmode {complete|degraded|partial}'
option to lvchange/vgchange. It can also be set in lvm.conf.
The "degraded" activation mode allows RAID LVs with a sufficient
level of redundancy to activate (e.g. a RAID5 LV with one device
failure, a RAID6 with two device failures, or RAID1 with n-1
failures). RAID LVs with too many device failures are not allowed
to activate - nor are any non-redundant LVs that may have been
affected. This patch also makes the "degraded" mode the default
activation mode.
The degraded activation mode does not yet work in a cluster. A
new cluster lock flag (LCK_DEGRADED_MODE) will need to be created
to make that work. Currently, there is limited space for this
extra flag and I am looking for possible solutions. One possible
solution is to usurp LCK_CONVERT, as it is not used. When the
locking_type is 3, the degraded mode flag simply gets dropped and
the old ("complete") behavior is exhibited.
293 lines
12 KiB
Groff
293 lines
12 KiB
Groff
.TH LVCHANGE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvchange \(em change attributes of a logical volume
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.SH SYNOPSIS
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.B lvchange
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.RB [ \-\-addtag
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.IR Tag ]
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.RB [ \-A | \-\-autobackup
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.RI { y | n }]
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.RB [ \-a | \-\-activate
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.RI [ a | e | l ]{ y | n }]
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.RB [ \-\-activationmode
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.IR { complete | degraded | partial } ]
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.RB [ \-k | \-\-setactivationskip { y | n } ]
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.RB [ \-K | \-\-ignoreactivationskip ]
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.RB [ \-\-alloc
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.IR AllocationPolicy ]
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.RB [ \-\-commandprofile
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.IR ProfileName ]
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.RB [ \-C | \-\-contiguous
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.RI { y | n }]
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.RB [ \-d | \-\-debug ]
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.RB [ \-\-degraded ]
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.RB [ \-\-deltag
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.IR Tag ]
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.RB [ \-\-detachprofile ]
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.RB [ \-\-discards
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.RI { ignore | nopassdown | passdown }]
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.RB [ \-\-resync ]
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.RB [ \-h | \-? | \-\-help ]
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.RB [ \-\-ignorelockingfailure ]
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.RB [ \-\-ignoremonitoring ]
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.RB [ \-\-ignoreskippedcluster ]
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.RB [ \-\-monitor
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.RI { y | n }]
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.RB [ \-\-poll
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.RI { y | n }]
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.RB [ \-\-[raid]maxrecoveryrate
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.IR Rate ]
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.RB [ \-\-[raid]minrecoveryrate
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.IR Rate ]
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.RB [ \-\-[raid]syncaction
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.RI { check | repair }]
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.RB [ \-\-[raid]writebehind
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.IR IOCount ]
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.RB [ \-\-[raid]writemostly
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.IR PhysicalVolume [ : { t | n | y }]]
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.RB [ \-\-sysinit ]
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.RB [ \-\-noudevsync ]
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.RB [ \-\-metadataprofile
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.IR ProfileName ]
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.RB [ \-M | \-\-persistent
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.RI { y | n }]
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.RB [ \-\-minor
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.IR minor ]
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.RB [ \-P | \-\-partial ]
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.RB [ \-p | \-\-permission
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.RI { r | rw }]
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.RB [ \-r | \-\-readahead
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.RI { ReadAheadSectors | auto | none }]
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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 [ \-Z | \-\-zero
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.RI { y | n }]
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.I LogicalVolumePath
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.RI [ LogicalVolumePath ...]
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.SH DESCRIPTION
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lvchange allows you to change the attributes of a logical volume
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including making them known to the kernel ready for use.
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.SH OPTIONS
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See \fBlvm\fP(8) for common options.
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.TP
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.BR \-a ", " \-\-activate " [" \fIa | \fIe | \fIl ]{ \fIy | \fIn }
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Controls the availability of the logical volumes for use.
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Communicates with the kernel device-mapper driver via
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libdevmapper to activate (\-ay) or deactivate (\-an) the
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logical volumes.
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.IP
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Activation of a logical volume creates a symbolic link
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/dev/VolumeGroupName/LogicalVolumeName pointing to the device node.
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This link is removed on deactivation.
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All software and scripts should access the device through
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this symbolic link and present this as the name of the device.
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The location and name of the underlying device node may depend on
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the distribution and configuration (e.g. udev) and might change
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from release to release.
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.IP
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If autoactivation option is used (\-aay),
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the logical volume is activated only if it matches an item in
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the activation/auto_activation_volume_list set in lvm.conf.
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If this list is not set, then all volumes are considered for
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activation. The \-aay option should be also used during system
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boot so it's possible to select which volumes to activate using
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the activation/auto_activation_volume_list setting.
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.IP
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If clustered locking is enabled, -aey will activate exclusively
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on one node and -aly will activate only on the local node.
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To deactivate only on the local node use -aln.
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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 \-\-activationmode " {" \fIcomplete | \fIdegraded | \fIpartial }
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The activation mode determines whether logical volumes are allowed to
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activate when there are physical volumes missing (e.g. due to a device
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failure). \fIcomplete is the most restrictive; allowing only those
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logical volumes to be activated that are not affected by the missing
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PVs. \fIdegraded allows RAID logical volumes to be activated even if
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they have PVs missing. (Note that the "mirror" segment type is not
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considered a RAID logical volume. The "raid1" segment type should
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be used instead.) Finally, \fIpartial allows any logical volume to
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be activated even if portions are missing due to a missing or failed
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PV. This last option should only be used when performing recovery or
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repair operations. \fIdegraded is the default mode. To change it, modify
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.B activation_mode
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in
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.BR lvm.conf (5).
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.TP
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.BR \-k ", " \-\-setactivationskip " {" \fIy | \fIn }
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Controls whether Logical Volumes are persistently flagged to be
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skipped during activation. By default, thin snapshot volumes are
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flagged for activation skip. To activate such volumes,
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an extra \fB\-K/\-\-ignoreactivationskip\fP option must be used.
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The flag is not applied during deactivation. To see whether
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the flag is attached, use \fBlvs\fP command where the state
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of the flag is reported within \fBlv_attr\fP bits.
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.TP
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.BR \-K ", " \-\-ignoreactivationskip
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Ignore the flag to skip Logical Volumes during activation.
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.TP
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.BR \-C ", " \-\-contiguous " {" \fIy | \fIn }
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Tries to set or reset the contiguous allocation policy for
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logical volumes. It's only possible to change a non-contiguous
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logical volume's allocation policy to contiguous, if all of the
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allocated physical extents are already contiguous.
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.TP
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.BR \-\-detachprofile
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Detach any metadata configuration profiles attached to given
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Logical Volumes. See \fBlvm.conf\fP(5) for more information
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about \fBmetadata profiles\fP.
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.TP
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.BR \-\-discards " {" \fIignore | \fInopassdown | \fIpassdown }
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Set this to \fIignore\fP to ignore any discards received by a
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thin pool Logical Volume. Set to \fInopassdown\fP to process such
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discards within the thin pool itself and allow the no-longer-needed
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extents to be overwritten by new data. Set to \fIpassdown\fP (the
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default) to process them both within the thin pool itself and to
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pass them down the underlying device.
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.TP
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.B \-\-resync
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Forces the complete resynchronization of a mirror. In normal
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circumstances you should not need this option because synchronization
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happens automatically. Data is read from the primary mirror device
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and copied to the others, so this can take a considerable amount of
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time - and during this time you are without a complete redundant copy
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of your data.
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.TP
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.B \-\-metadataprofile " " \fIProfileName
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Uses and attaches ProfileName configuration profile to the logical
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volume metadata. Whenever the logical volume is processed next time,
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the profile is automatically applied. If the volume group has another
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profile attached, the logical volume profile is preferred.
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See \fBlvm.conf\fP(5) for more information about \fBmetadata profiles\fP.
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.TP
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.B \-\-minor \fIminor
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Set the minor number.
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.TP
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.BR \-\-monitor " {" \fIy | \fIn }
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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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\fBmirror_image_fault_policy\fP and \fBmirror_log_fault_policy\fP
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set in \fBlvm.conf\fP.
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.TP
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.BR \-\-poll " {" \fIy | \fIn }
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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
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\fB\-\-poll n\fP to defer and then \fB\-\-poll y\fP to restart the process.
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.TP
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.IR \fB\-\-[raid]maxrecoveryrate " " \fIRate [ bBsSkKmMgG ]
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Sets the maximum recovery rate for a RAID logical volume. \fIRate\fP
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is specified as an amount per second for each device in the array.
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If no suffix is given, then KiB/sec/device is assumed. Setting the
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recovery rate to 0 means it will be unbounded.
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.TP
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.IR \fB\-\-[raid]minrecoveryrate " " \fIRate [ bBsSkKmMgG ]
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Sets the minimum recovery rate for a RAID logical volume. \fIRate\fP
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is specified as an amount per second for each device in the array.
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If no suffix is given, then KiB/sec/device is assumed. Setting the
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recovery rate to 0 means it will be unbounded.
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.TP
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.BR \-\-[raid]syncaction " {" \fIcheck | \fIrepair }
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This argument is used to initiate various RAID synchronization operations.
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The \fIcheck\fP and \fIrepair\fP options provide a way to check the
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integrity of a RAID logical volume (often referred to as "scrubbing").
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These options cause the RAID logical volume to
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read all of the data and parity blocks in the array and check for any
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discrepancies (e.g. mismatches between mirrors or incorrect parity values).
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If \fIcheck\fP is used, the discrepancies will be counted but not repaired.
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If \fIrepair\fP is used, the discrepancies will be corrected as they are
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encountered. The 'lvs' command can be used to show the number of
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discrepancies found or repaired.
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.TP
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.BR \-\-[raid]writebehind " " \fIIOCount
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Specify the maximum number of outstanding writes that are allowed to
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devices in a RAID1 logical volume that are marked as \fIwrite-mostly\fP.
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Once this value is exceeded, writes become synchronous (i.e. all writes
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to the constituent devices must complete before the array signals the
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write has completed). Setting the value to zero clears the preference
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and allows the system to choose the value arbitrarily.
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.TP
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.IR \fB\-\-[raid]writemostly " " PhysicalVolume [ : { t | y | n }]
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Mark a device in a RAID1 logical volume as \fIwrite-mostly\fP. All reads
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to these drives will be avoided unless absolutely necessary. This keeps
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the number of I/Os to the drive to a minimum. The default behavior is to
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set the write-mostly attribute for the specified physical volume in the
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logical volume. It is possible to also remove the write-mostly flag by
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appending a ":n" to the physical volume or to toggle the value by specifying
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":t". The \fB\-\-writemostly\fP argument can be specified more than one time
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in a single command; making it possible to toggle the write-mostly attributes
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for all the physical volumes in a logical volume at once.
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.TP
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.B \-\-sysinit
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Indicates that \fBlvchange\fP(8) is being invoked from early system
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initialisation scripts (e.g. rc.sysinit or an initrd),
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before writeable filesystems are available. As such,
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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,
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\fB\-\-ignoremonitoring\fP, \fB\-\-poll n\fP and setting
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\fBLVM_SUPPRESS_LOCKING_FAILURE_MESSAGES\fP
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environment variable.
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If \fB\-\-sysinit\fP is used in conjunction with lvmetad(8) enabled and running,
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autoactivation is preferred over manual activation via direct lvchange call.
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Logical volumes are autoactivated according to auto_activation_volume_list
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set in lvm.conf(5).
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.TP
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.B \-\-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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.B \-\-ignoremonitoring
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Make no attempt to interact with dmeventd unless \fB\-\-monitor\fP
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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 \-M ", " \-\-persistent " {" \fIy | \fIn }
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Set to y to make the minor number specified persistent.
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.TP
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.BR \-p ", " \-\-permission " {" \fIr | \fIrw }
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Change access permission to read-only or read/write.
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.TP
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.BR \-r ", " \-\-readahead " {" \fIReadAheadSectors | \fIauto | \fInone }
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Set read ahead sector count of this logical volume.
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For volume groups with metadata in lvm1 format, this must
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be a value between 2 and 120 sectors.
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The default value is "auto" which allows the kernel to choose
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a suitable value automatically.
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"None" is equivalent to specifying zero.
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.TP
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.B \-\-refresh
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If the logical volume 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 \-Z ", " \-\-zero " {" \fIy | \fIn }
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Set zeroing mode for thin pool. Note: already provisioned blocks from pool
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in non-zero mode are not cleared in unwritten parts when setting zero to
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\fIy\fP.
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.SH ENVIRONMENT VARIABLES
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.TP
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.B LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES
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Suppress locking failure messages.
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.SH Examples
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Changes the permission on volume lvol1 in volume group vg00 to be read-only:
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.sp
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.B lvchange \-pr vg00/lvol1
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.SH SEE ALSO
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.BR lvm (8),
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.BR lvmcache (7),
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.BR lvmthin (7),
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.BR lvcreate (8),
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.BR vgchange (8)
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