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VGCREATE(8) System Manager's Manual VGCREATE(8)
NAME
vgcreate - Create a volume group
SYNOPSIS
vgcreate position_args
[ option_args ]
DESCRIPTION
vgcreate creates a new VG on block devices. If the devices were not previously intialized
as PVs with pvcreate(8), vgcreate will inititialize them, making them PVs. The pvcreate
options for initializing devices are also available with vgcreate.
When vgcreate uses an existing PV, that PV's existing values for metadata size, PE start,
etc, are used, even if different values are specified in the vgcreate command. To change
these values, first use pvremove on the device.
USAGE
vgcreate VG_new PV ...
[ -A|--autobackup y|n ]
[ -c|--clustered y|n ]
[ -l|--maxlogicalvolumes Number ]
[ -p|--maxphysicalvolumes Number ]
[ -M|--metadatatype lvm2 ]
[ -s|--physicalextentsize Size[m|UNIT] ]
[ -f|--force ]
[ -Z|--zero y|n ]
[ --addtag Tag ]
[ --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit ]
[ --metadataprofile String ]
[ --labelsector Number ]
[ --metadatasize Size[m|UNIT] ]
[ --pvmetadatacopies 0|1|2 ]
[ --[vg]metadatacopies all|unmanaged|Number ]
[ --reportformat basic|json ]
[ --dataalignment Size[k|UNIT] ]
[ --dataalignmentoffset Size[k|UNIT] ]
[ --shared ]
[ --systemid String ]
[ --locktype sanlock|dlm|none ]
[ COMMON_OPTIONS ]
Common options for lvm:
[ -d|--debug ]
[ -h|--help ]
[ -q|--quiet ]
[ -t|--test ]
[ -v|--verbose ]
[ -y|--yes ]
[ --commandprofile String ]
[ --config String ]
[ --driverloaded y|n ]
[ --lockopt String ]
[ --longhelp ]
[ --nolocking ]
[ --profile String ]
[ --version ]
OPTIONS
--addtag Tag
Adds a tag to a PV, VG or LV. This option can be repeated to add multiple tags at
once. See lvm(8) for information about tags.
--alloc contiguous|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 overriden 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 infor-
mation about allocation.
-A|--autobackup y|n
Specifies if metadata should be backed up automatically after a change. Enabling
this is strongly advised! See vgcfgbackup(8) for more information.
-c|--clustered y|n
This option was specific to clvm and is now replaced by the --shared option with
lvmlockd(8).
--commandprofile String
The command profile to use for command configuration. See lvm.conf(5) for more in-
formation about profiles.
--config String
Config settings for the command. These override lvm.conf settings. The String arg
uses the same format as lvm.conf, or may use section/field syntax. See lvm.conf(5)
for more information about config.
--dataalignment Size[k|UNIT]
Align the start of a PV data area with a multiple of this number. To see the loca-
tion of the first Physical Extent (PE) of an existing PV, use pvs -o +pe_start. In
addition, it may be shifted by an alignment offset, see --dataalignmentoffset.
Also specify an appropriate PE size when creating a VG.
--dataalignmentoffset Size[k|UNIT]
Shift the start of the PV data area by this additional offset.
-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).
--driverloaded y|n
If set to no, the command will not attempt to use device-mapper. For testing and
debugging.
-f|--force ...
Override various checks, confirmations and protections. Use with extreme caution.
-h|--help
Display help text.
--labelsector Number
By default the PV is labelled with an LVM2 identifier in its second sector (sector
1). This lets you use a different sector near the start of the disk (between 0 and
3 inclusive - see LABEL_SCAN_SECTORS in the source). Use with care.
--lockopt String
Used to pass options for special cases to lvmlockd. See lvmlockd(8) for more in-
formation.
--locktype sanlock|dlm|none
Specify the VG lock type directly in place of using --shared. See lvmlockd(8) for
more information.
--longhelp
Display long help text.
-l|--maxlogicalvolumes Number
Sets the maximum number of LVs allowed in a VG.
-p|--maxphysicalvolumes Number
Sets the maximum number of PVs that can belong to the VG. The value 0 removes any
limitation. For large numbers of PVs, also see options --pvmetadatacopies, and
--vgmetadatacopies for improving performance.
--metadataprofile String
The metadata profile to use for command configuration. See lvm.conf(5) for more
information about profiles.
--metadatasize Size[m|UNIT]
The approximate amount of space used for each VG metadata area. The size may be
rounded.
-M|--metadatatype lvm2
Specifies the type of on-disk metadata to use. lvm2 (or just 2) is the current,
standard format. lvm1 (or just 1) is no longer used.
--nolocking
Disable locking.
-s|--physicalextentsize Size[m|UNIT]
Sets the physical extent size of PVs in the VG. The value must be either a power
of 2 of at least 1 sector (where the sector size is the largest sector size of the
PVs currently used in the VG), or at least 128KiB. Once this value has been set,
it is difficult to change without recreating the VG, unless no extents need moving.
--profile String
An alias for --commandprofile or --metadataprofile, depending on the command.
--pvmetadatacopies 0|1|2
The number of metadata areas to set aside on a PV for storing VG metadata. When 2,
one copy of the VG metadata is stored at the front of the PV and a second copy is
stored at the end. When 1, one copy of the VG metadata is stored at the front of
the PV. When 0, no copies of the VG metadata are stored on the given PV. This may
be useful in VGs containing many PVs (this places limitations on the ability to use
vgsplit later.)
-q|--quiet ...
Suppress output and log messages. Overrides --debug and --verbose. Repeat once to
also suppress any prompts with answer 'no'.
--reportformat basic|json
Overrides current output format for reports which is defined globally by the re-
port/output_format setting in lvm.conf. 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 for-
mat. See lvmreport(7) for more information.
--shared
Create a shared VG using lvmlockd if LVM is compiled with lockd support. lvmlockd
will select lock type sanlock or dlm depending on which lock manager is running.
This allows multiple hosts to share a VG on shared devices. lvmlockd and a lock
manager must be configured and running. See lvmlockd(8) for more information about
shared VGs.
--systemid String
Specifies the system ID that will be given to the new VG, overriding the system ID
of the host running the command. A VG is normally created without this option, in
which case the new VG is given the system ID of the host creating it. Using this
option requires caution because the system ID of the new VG may not match the sys-
tem ID of the host running the command, leaving the VG inaccessible to the host.
See lvmsystemid(7) for more information.
-t|--test
Run in test mode. Commands will not update metadata. This is implemented by dis-
abling all metadata writing but nevertheless returning success to the calling func-
tion. 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.
-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.
--[vg]metadatacopies all|unmanaged|Number
Number of copies of the VG metadata that are kept. VG metadata is kept in VG meta-
data areas on PVs in the VG, i.e. reserved space at the start and/or end of the
PVs. Keeping a copy of the VG metadata on every PV can reduce performance in VGs
containing a large number of PVs. When this number is set to a non-zero value, LVM
will automatically choose PVs on which to store metadata, using the metadataignore
flags on PVs to achieve the specified number. The number can also be replaced with
special string values: unmanaged causes LVM to not automatically manage the PV
metadataignore flags. all causes LVM to first clear the metadataignore flags on
all PVs, and then to become unmanaged.
-y|--yes
Do not prompt for confirmation interactively but always assume the answer yes. Use
with extreme caution. (For automatic no, see -qq.)
-Z|--zero y|n
Controls if the first 4 sectors (2048 bytes) of the device are wiped. The default
is to wipe these sectors unless either or both of --restorefile or --uuid are spec-
ified.
VARIABLES
VG
Volume Group name. See lvm(8) for valid names.
PV
Physical Volume name, a device path under /dev. For commands managing physical ex-
tents, a PV positional arg generally accepts a suffix indicating a range (or multi-
ple ranges) of physical extents (PEs). When the first PE is omitted, it defaults to
the start of the device, and when the last PE is omitted it defaults to end. Start
and end range (inclusive): PV[:PE-PE]... Start and length range (counting from 0):
PV[:PE+PE]...
String
See the option description for information about the string content.
Size[UNIT]
Size is an input number that accepts an optional unit. Input units are always
treated as base two values, regardless of capitalization, e.g. 'k' and 'K' both re-
fer to 1024. The default input unit is specified by letter, followed by |UNIT.
UNIT represents other possible input units: bBsSkKmMgGtTpPeE. b|B is bytes, s|S is
sectors of 512 bytes, k|K is KiB, m|M is MiB, g|G is GiB, t|T is TiB, p|P is PiB,
e|E is EiB. (This should not be confused with the output control --units, where
capital letters mean multiple of 1000.)
ENVIRONMENT VARIABLES
See lvm(8) for information about environment variables used by lvm. For example,
LVM_VG_NAME can generally be substituted for a required VG parameter.
EXAMPLES
Create a VG with two PVs, using the default physical extent size.
vgcreate myvg /dev/sdk1 /dev/sdl1
SEE ALSO
lvm(8) lvm.conf(5) lvmconfig(8)
pvchange(8) pvck(8) pvcreate(8) pvdisplay(8) pvmove(8) pvremove(8) pvresize(8) pvs(8) pvs-
can(8)
vgcfgbackup(8) vgcfgrestore(8) vgchange(8) vgck(8) vgcreate(8) vgconvert(8) vgdisplay(8)
vgexport(8) vgextend(8) vgimport(8) vgimportclone(8) vgmerge(8) vgmknodes(8) vgreduce(8)
vgremove(8) vgrename(8) vgs(8) vgscan(8) vgsplit(8)
lvcreate(8) lvchange(8) lvconvert(8) lvdisplay(8) lvextend(8) lvreduce(8) lvremove(8)
lvrename(8) lvresize(8) lvs(8) lvscan(8)
lvm-fullreport(8) lvm-lvpoll(8) lvm2-activation-generator(8) blkdeactivate(8) lvmdump(8)
dmeventd(8) lvmpolld(8) lvmlockd(8) lvmlockctl(8) cmirrord(8) lvmdbusd(8)
lvmsystemid(7) lvmreport(7) lvmraid(7) lvmthin(7) lvmcache(7)
Red Hat, Inc. LVM TOOLS 2.03.11(2) (2021-01-08) VGCREATE(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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