LVCHANGE(8)LVCHANGE(8)NAMElvchange - change attributes of a logical volume
SYNOPSISlvchange [--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] [--ignorelock‐
ingfailure] [--ignoremonitoring] [--ignoreskippedcluster] [--monitor
{y|n}] [--poll {y|n}] [--[raid]maxrecoveryrate Rate] [--[raid]minrecov‐
eryrate Rate] [--[raid]syncaction {check|repair}] [--[raid]writebehind
IOCount] [--[raid]writemostly PhysicalVolume[:{t|n|y}]] [--sysinit]
[--noudevsync] [-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}] LogicalVol‐
umePath [LogicalVolumePath...]
DESCRIPTIONlvchange 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. Com‐
municates 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 activa‐
tion/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 pos‐
sible to select which volumes to activate using the activa‐
tion/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.
-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 logi‐
cal volumes. It's only possible to change a non-contiguous logi‐
cal 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 Vol‐
umes. 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 synchro‐
nization happens automatically. Data is read from the primary
mirror device and copied to the others, so this can take a con‐
siderable 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 moni‐
tored 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 incor‐
rect parity values). If check is used, the discrepancies will
be counted but not repaired. If repair is used, the discrepan‐
cies 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 syn‐
chronous (i.e. all writes to the constituent devices must com‐
plete before the array signals the write has completed). Set‐
ting the value to zero clears the preference and allows the sys‐
tem 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 neces‐
sary. 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 pos‐
sible 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 logi‐
cal 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 equiva‐
lent to using --ignorelockingfailure, --ignoremonitoring,
--poll n and setting LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES envi‐
ronment 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 accord‐
ing 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 some‐
thing 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 ALSOlvm(8), lvcreate(8), vgchange(8)Sistina Software UK LVM TOOLS 2.02.106(2) (2014-04-10) LVCHANGE(8)
