--alloccontiguous|cling|cling_by_tags|normal|anywhere|inherit
Determines the allocation policy when a command needs to allocate Physical Extents (PEs) from the
VG. Each VG and LV has an allocation policy which can be changed with vgchange/lvchange, or over‐
ridden on the command line. normal applies common sense rules such as not placing parallel
stripes on the same PV. inherit applies the VG policy to an LV. contiguous requires new PEs be
placed adjacent to existing PEs. cling places new PEs on the same PV as existing PEs in the same
stripe of the LV. If there are sufficient PEs for an allocation, but normal does not use them,
anywhere will use them even if it reduces performance, e.g. by placing two stripes on the same PV.
Optional positional PV args on the command line can also be used to limit which PVs the command
will use for allocation. See lvm(8) for more information about allocation.
-A|--autobackupy|n
Specifies if metadata should be backed up automatically after a change. Enabling this is strongly
advised! See vgcfgbackup(8) for more information.
--commandprofileString
The command profile to use for command configuration. See lvm.conf(5) for more information about
profiles.
--configString
Config settings for the command. These override lvm.conf(5) settings. The String arg uses the
same format as lvm.conf(5), or may use section/field syntax. See lvm.conf(5) for more information
about config.
-d|--debug ...
Set debug level. Repeat from 1 to 6 times to increase the detail of messages sent to the log file
and/or syslog (if configured).
--devicesPV
Restricts the devices that are visible and accessible to the command. Devices not listed will ap‐
pear to be missing. This option can be repeated, or accepts a comma separated list of devices.
This overrides the devices file.
--devicesfileString
A file listing devices that LVM should use. The file must exist in /etc/lvm/devices/ and is man‐
aged with the lvmdevices(8) command. This overrides the lvm.conf(5) devices/devicesfile and de‐vices/use_devicesfile settings.
--driverloadedy|n
If set to no, the command will not attempt to use device-mapper. For testing and debugging.
-l|--extents [+|-]Number[PERCENT]
Specifies the new size of the LV in logical extents. The --size and --extents options are alter‐
nate methods of specifying size. The total number of physical extents used will be greater when
redundant data is needed for RAID levels. An alternate syntax allows the size to be determined
indirectly as a percentage of the size of a related VG, LV, or set of PVs. The suffix %VG denotes
the total size of the VG, the suffix %FREE the remaining free space in the VG, and the suffix %PVS
the free space in the specified PVs. For a snapshot, the size can be expressed as a percentage of
the total size of the origin LV with the suffix %ORIGIN (100%ORIGIN provides space for the whole
origin). When expressed as a percentage, the size defines an upper limit for the number of logi‐
cal extents in the new LV. The precise number of logical extents in the new LV is not determined
until the command has completed. When the plus + or minus - prefix is used, the value is not an
absolute size, but is relative and added or subtracted from the current size.
-f|--force ...
Override various checks, confirmations and protections. Use with extreme caution.
--fsString
Control file system resizing when resizing an LV. checksize: Check the fs size and reduce the LV
if the fs is not using the reduced space (fs reduce is not needed.) If the reduced space is used
by the fs, then do not resize the fs or LV, and return an error. (checksize only applies when re‐
ducing, and does nothing for extend.) resize: Resize the fs by calling the fs-specific resize
command. This may also include mounting, unmounting, or running fsck. See --fsmode to control
mounting behavior, and --nofsck to disable fsck. resize_fsadm: Use the old method of calling
fsadm to handle the fs (deprecated.) Warning: this option does not prevent lvreduce from destroy‐
ing file systems that are unmounted (or mounted if prompts are skipped.) ignore: Resize the LV
without checking for or handling a file system. Warning: using ignore when reducing the LV size
may destroy the file system.
--fsmodeString
Control file system mounting behavior for fs resize. manage: Mount or unmount the fs as needed to
resize the fs, and attempt to restore the original mount state at the end. nochange: Do not mount
or unmount the fs. If mounting or unmounting is required to resize the fs, then do not resize the
fs or the LV and fail the command. offline: Unmount the fs if it is mounted, and resize the fs
while it is unmounted. If mounting is required to resize the fs, then do not resize the fs or the
LV and fail the command.
-h|--help
Display help text.
--journalString
Record information in the systemd journal. This information is in addition to information enabled
by the lvm.conf log/journal setting. command: record information about the command. output:
record the default command output. debug: record full command debugging.
--lockoptString
Used to pass options for special cases to lvmlockd. See lvmlockd(8) for more information.
--longhelp
Display long help text.
-n|--nofsck
Do not perform fsck when resizing the file system with --resizefs.
--nohints
Do not use the hints file to locate devices for PVs. A command may read more devices to find PVs
when hints are not used. The command will still perform standard hint file invalidation where ap‐
propriate.
--nolocking
Disable locking. Use with caution, concurrent commands may produce incorrect results.
--nosync
Causes the creation of mirror, raid1, raid4, raid5 and raid10 to skip the initial synchronization.
In case of mirror, raid1 and raid10, any data written afterwards will be mirrored, but the origi‐
nal contents will not be copied. In case of raid4 and raid5, no parity blocks will be written,
though any data written afterwards will cause parity blocks to be stored. This is useful for
skipping a potentially long and resource intensive initial sync of an empty mir‐
ror/raid1/raid4/raid5 and raid10 LV. This option is not valid for raid6, because raid6 relies on
proper parity (P and Q Syndromes) being created during initial synchronization in order to recon‐
struct proper user date in case of device failures. raid0 and raid0_meta do not provide any data
copies or parity support and thus do not support initial synchronization.
--noudevsync
Disables udev synchronization. The process will not wait for notification from udev. It will con‐
tinue irrespective of any possible udev processing in the background. Only use this if udev is not
running or has rules that ignore the devices LVM creates.
--poolmetadatasize [+]Size[m|UNIT]
Specifies the new size of the pool metadata LV. The plus prefix + can be used, in which case the
value is added to the current size.
--profileString
An alias for --commandprofile or --metadataprofile, depending on the command.
-q|--quiet ...
Suppress output and log messages. Overrides --debug and --verbose. Repeat once to also suppress
any prompts with answer 'no'.
--reportformatbasic|json|json_std
Overrides current output format for reports which is defined globally by the report/output_format
setting in lvm.conf(5). basic is the original format with columns and rows. If there is more
than one report per command, each report is prefixed with the report name for identification. json
produces report output in JSON format. json_std produces report output in JSON format which is
more compliant with JSON standard. See lvmreport(7) for more information.
-r|--resizefs
Resize the fs using the fs-specific resize command. May include mounting, unmounting, or running
fsck. See --fsmode to control mounting behavior, and --nofsck to disable fsck. See --fs for more
options (--resizefs is equivalent to --fs resize.)
-L|--size [+|-]Size[m|UNIT]
Specifies the new size of the LV. The --size and --extents options are alternate methods of spec‐
ifying size. The total number of physical extents used will be greater when redundant data is
needed for RAID levels. When the plus + or minus - prefix is used, the value is not an absolute
size, but is relative and added or subtracted from the current size.
-i|--stripesNumber
Specifies the number of stripes in a striped LV. This is the number of PVs (devices) that a
striped LV is spread across. Data that appears sequential in the LV is spread across multiple de‐
vices in units of the stripe size (see --stripesize). This does not change existing allocated
space, but only applies to space being allocated by the command. When creating a RAID 4/5/6 LV,
this number does not include the extra devices that are required for parity. The largest number
depends on the RAID type (raid0: 64, raid10: 32, raid4/5: 63, raid6: 62), and when unspecified,
the default depends on the RAID type (raid0: 2, raid10: 2, raid4/5: 3, raid6: 5.) To stripe a new
raid LV across all PVs by default, see lvm.conf(5) allocation/raid_stripe_all_devices.
-I|--stripesizeSize[k|UNIT]
The amount of data that is written to one device before moving to the next in a striped LV.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented by disabling all metada‐
ta writing but nevertheless returning success to the calling function. This may lead to unusual
error messages in multi-stage operations if a tool relies on reading back metadata it believes has
changed but hasn't.
--typelinear|striped|snapshot|raid|mirror|thin|thin-pool|vdo|vdo-pool|cache|cache-pool|writecache
The LV type, also known as "segment type" or "segtype". See usage descriptions for the specific
ways to use these types. For more information about redundancy and performance (raid<N>, mirror,
striped, linear) see lvmraid(7). For thin provisioning (thin, thin-pool) see lvmthin(7). For
performance caching (cache, cache-pool) see lvmcache(7). For copy-on-write snapshots (snapshot)
see usage definitions. For VDO (vdo) see lvmvdo(7). Several commands omit an explicit type op‐
tion because the type is inferred from other options or shortcuts (e.g. --stripes, --mirrors,
--snapshot, --virtualsize, --thin, --cache, --vdo). Use inferred types with care because it can
lead to unexpected results.
-v|--verbose ...
Set verbose level. Repeat from 1 to 4 times to increase the detail of messages sent to stdout and
stderr.
--version
Display version information.
-y|--yes
Do not prompt for confirmation interactively but always assume the answer yes. Use with extreme
caution. (For automatic no, see -qq.)
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