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}] [-k|--setactivationskip{y|n}] [-K|--ignoreactivationskip]
[--alloc AllocationPolicy] [-C|--contiguous {y|n}] [-d|--debug] [--deltag Tag] [--profile ProfileName] [--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]writebe-
hind IOCount] [--[raid]writemostly PhysicalVolume[:{t|n|y}]] [--sysinit] [--noudevsync] [-M|--persistent {y|n}] [--minor minor] [-P|--par-
tial] [-p|--permission {r|rw}] [-r|--readahead {ReadAheadSectors|auto|none}] [--refresh] [-t|--test] [-v|--verbose] [-Z|--zero {y|n}] Logi-
calVolumePath [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. 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 volumes 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 deac-
tivate only on the local node use -aln. Logical volumes with single-host snapshots are always activated exclusively because they
can only be used on one node at once.
-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 contiguous, if all of the allocated physical extents are already contiguous.
--detachprofile
Detach any configuration profiles attached to given Logical Volumes. See also lvm(8) and lvm.conf(5) for more information about
configuration 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.
--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_policy 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. However, 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 val-
ues). 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' command 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 speci-
fied 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 com-
mand; 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 write-
able 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_LOCKING_FAILURE_MESSAGES environment variable.
If --sysinit is used in conjunction with lvmetad(8) enabled and running, autoactivation is preferred over manual activation via
direct lvchange call. Logical volumes 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 cre-
ates.
--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 metadata 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 equiva-
lent 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.
Examples
Changes the permission on volume lvol1 in volume group vg00 to be read-only:
lvchange -pr vg00/lvol1
SEE ALSO
lvm(8), lvcreate(8), vgchange(8)
Sistina Software UK LVM TOOLS 2.02.105(2)-RHEL7 (2014-03-26) LVCHANGE(8)