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lvchange(8) - phpMan
LVCHANGE(8) System Manager's Manual LVCHANGE(8)
NAME
lvchange — change attributes of a logical volume
SYNOPSIS
lvchange [--addtag Tag] [-A|--autobackup {y|n}] [-a|--activate [a|e|l]{y|n}] [--activa‐
tionmode {complete|degraded|partial}] [-k|--setactivationskip{y|n}] [-K|--ignoreactiva‐
tionskip] [--alloc AllocationPolicy] [--commandprofile ProfileName] [-C|--contiguous
{y|n}] [-d|--debug] [--degraded] [--deltag Tag] [--detachprofile] [--discards
{ignore|nopassdown|passdown}] [--resync] [-h|-?|--help] [--ignorelockingfailure]
[--ignoremonitoring] [--ignoreskippedcluster] [--monitor {y|n}] [--poll {y|n}]
[--[raid]maxrecoveryrate Rate] [--[raid]minrecoveryrate Rate] [--[raid]syncaction
{check|repair}] [--[raid]writebehind IOCount] [--[raid]writemostly PhysicalVol‐
ume[:{t|n|y}]] [--sysinit] [--noudevsync] [--metadataprofile ProfileName] [-M|--persistent
{y|n}] [--minor minor] [-P|--partial] [-p|--permission {r|rw}] [-r|--readahead {ReadAhead‐
Sectors|auto|none}] [--refresh] [-t|--test] [-v|--verbose] [-Z|--zero {y|n}] LogicalVol‐
umePath [LogicalVolumePath...]
DESCRIPTION
lvchange allows you to change the attributes of a logical volume including making them
known to the kernel ready for use.
OPTIONS
See lvm(8) for common options.
-a, --activate [a|e|l]{y|n}
Controls the availability of the logical volumes for use. Communicates with the
kernel device-mapper driver via libdevmapper to activate (-ay) or deactivate (-an)
the logical volumes.
Activation of a logical volume creates a symbolic link /dev/VolumeGroupName/Logi‐
calVolumeName pointing to the device node. This link is removed on deactivation.
All software and scripts should access the device through this symbolic link and
present this as the name of the device. The location and name of the underlying
device node may depend on the distribution and configuration (e.g. udev) and might
change from release to release.
If autoactivation option is used (-aay), the logical volume is activated only if it
matches an item in the activation/auto_activation_volume_list set in lvm.conf. If
this list is not set, then all volumes are considered for activation. The -aay
option should be also used during system boot so it's possible to select which vol‐
umes to activate using the activation/auto_activation_volume_list setting.
If clustered locking is enabled, -aey will activate exclusively on one node and
-aly will activate only on the local node. To deactivate only on the local node
use -aln. Logical volumes with single-host snapshots are always activated exclu‐
sively because they can only be used on one node at once.
--activationmode {complete|degraded|partial}
The activation mode determines whether logical volumes are allowed to activate when
there are physical volumes missing (e.g. due to a device failure). complete is the
most restrictive; allowing only those logical volumes to be activated that are not
affected by the missing PVs. degraded allows RAID logical volumes to be activated
even if they have PVs missing. (Note that the "mirror" segment type is not consid‐
ered a RAID logical volume. The "raid1" segment type should be used instead.)
Finally, partial allows any logical volume to be activated even if portions are
missing due to a missing or failed PV. This last option should only be used when
performing recovery or repair operations. degraded is the default mode. To change
it, modify activation_mode in lvm.conf(5).
-k, --setactivationskip {y|n}
Controls whether Logical Volumes are persistently flagged to be skipped during
activation. By default, thin snapshot volumes are flagged for activation skip. To
activate such volumes, an extra -K/--ignoreactivationskip option must be used. The
flag is not applied during deactivation. To see whether the flag is attached, use
lvs command where the state of the flag is reported within lv_attr bits.
-K, --ignoreactivationskip
Ignore the flag to skip Logical Volumes during activation.
-C, --contiguous {y|n}
Tries to set or reset the contiguous allocation policy for logical volumes. It's
only possible to change a non-contiguous logical volume's allocation policy to con‐
tiguous, if all of the allocated physical extents are already contiguous.
--detachprofile
Detach any metadata configuration profiles attached to given Logical Volumes. See
lvm.conf(5) for more information about metadata profiles.
--discards {ignore|nopassdown|passdown}
Set this to ignore to ignore any discards received by a thin pool Logical Volume.
Set to nopassdown to process such discards within the thin pool itself and allow
the no-longer-needed extents to be overwritten by new data. Set to passdown (the
default) to process them both within the thin pool itself and to pass them down the
underlying device.
--resync
Forces the complete resynchronization of a mirror. In normal circumstances you
should not need this option because synchronization happens automatically. Data is
read from the primary mirror device and copied to the others, so this can take a
considerable amount of time - and during this time you are without a complete
redundant copy of your data.
--metadataprofile ProfileName
Uses and attaches ProfileName configuration profile to the logical volume metadata.
Whenever the logical volume is processed next time, the profile is automatically
applied. If the volume group has another profile attached, the logical volume pro‐
file is preferred. See lvm.conf(5) for more information about metadata profiles.
--minor minor
Set the minor number.
--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 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.
--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.
--[raid]maxrecoveryrate Rate[bBsSkKmMgG]
Sets the maximum recovery rate for a RAID logical volume. Rate is specified as an
amount per second for each device in the array. If no suffix is given, then
KiB/sec/device is assumed. Setting the recovery rate to 0 means it will be
unbounded.
--[raid]minrecoveryrate Rate[bBsSkKmMgG]
Sets the minimum recovery rate for a RAID logical volume. Rate is specified as an
amount per second for each device in the array. If no suffix is given, then
KiB/sec/device is assumed. Setting the recovery rate to 0 means it will be
unbounded.
--[raid]syncaction {check|repair}
This argument is used to initiate various RAID synchronization operations. The
check and repair options provide a way to check the integrity of a RAID logical
volume (often referred to as "scrubbing"). These options cause the RAID logical
volume to read all of the data and parity blocks in the array and check for any
discrepancies (e.g. mismatches between mirrors or incorrect parity values). If
check is used, the discrepancies will be counted but not repaired. If repair is
used, the discrepancies will be corrected as they are encountered. The 'lvs' com‐
mand can be used to show the number of discrepancies found or repaired.
--[raid]writebehind IOCount
Specify the maximum number of outstanding writes that are allowed to devices in a
RAID1 logical volume that are marked as write-mostly. Once this value is exceeded,
writes become synchronous (i.e. all writes to the constituent devices must complete
before the array signals the write has completed). Setting the value to zero
clears the preference and allows the system to choose the value arbitrarily.
--[raid]writemostly PhysicalVolume[:{t|y|n}]
Mark a device in a RAID1 logical volume as write-mostly. All reads to these drives
will be avoided unless absolutely necessary. This keeps the number of I/Os to the
drive to a minimum. The default behavior is to set the write-mostly attribute for
the specified physical volume in the logical volume. It is possible to also remove
the write-mostly flag by appending a ":n" to the physical volume or to toggle the
value by specifying ":t". The --writemostly argument can be specified more than
one time in a single command; making it possible to toggle the write-mostly
attributes for all the physical volumes in a logical volume at once.
--sysinit
Indicates that lvchange(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 equivalent to using
--ignorelockingfailure, --ignoremonitoring, --poll n and setting LVM_SUPPRESS_LOCK‐
ING_FAILURE_MESSAGES environment variable.
If --sysinit is used in conjunction with lvmetad(8) enabled and running, autoacti‐
vation is preferred over manual activation via direct lvchange call. Logical vol‐
umes are autoactivated according 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.
-M, --persistent {y|n}
Set to y to make the minor number specified persistent.
-p, --permission {r|rw}
Change access permission to read-only or read/write.
-r, --readahead {ReadAheadSectors|auto|none}
Set read ahead sector count of this logical volume. For volume groups with meta‐
data in lvm1 format, this must be a value between 2 and 120 sectors. The default
value is "auto" which allows the kernel to choose a suitable value automatically.
"None" is equivalent to specifying zero.
--refresh
If the logical volume 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.
-Z, --zero {y|n}
Set zeroing mode for thin pool. Note: already provisioned blocks from pool in non-
zero mode are not cleared in unwritten parts when setting zero to y.
ENVIRONMENT VARIABLES
LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES
Suppress locking failure messages.
Examples
Changes the permission on volume lvol1 in volume group vg00 to be read-only:
lvchange -pr vg00/lvol1
SEE ALSO
lvm(8), lvmcache(7), lvmthin(7), lvcreate(8), vgchange(8)
Sistina Software UK LVM TOOLS 2.02.111(2) (2014-09-01) LVCHANGE(8)
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