NAME¶
lvchange — change attributes of a logical volume
SYNOPSIS¶
lvchange [
--addtag Tag] [
-A|
--autobackup
{
y|
n}] [
-a|
--activate
[
a|
e|
l]{
y|
n}] [
--activationmode
{complete
|degraded
|partial
}]
[
-k|
--setactivationskip{
y|
n}
]
[
-K|
--ignoreactivationskip] [
--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
PhysicalVolume[
:{
t|
n|
y}]]
[
--sysinit] [
--noudevsync] [
--metadataprofile
ProfileName] [
-M|
--persistent {
y|
n}]
[
--minor minor] [
-P|
--partial]
[
-p|
--permission {
r|
rw}]
[
-r|
--readahead
{
ReadAheadSectors|
auto|
none}] [
--refresh]
[
-t|
--test] [
-v|
--verbose]
[
-Z|
--zero {
y|
n}]
LogicalVolumePath
[
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/LogicalVolumeName 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 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 deactivate 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.
- --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 considered 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 contiguous, 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 profile 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_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
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' 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 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_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 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
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 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)