pvcreate - initialize a disk or partition for use by LVM
pvcreate [-d|--debug] [-f[f]|--force [--force]] [-y|--yes] [-h|--help] [-t|--test]
[-v|--verbose] [--labelsector] [-M|--metadatatypetype] [--metadatacopies#copies] [--meta-
datasizesize] [--restorefilefile] [--setphysicalvolumesizesize] [-u|--uuiduuid] [--ver-
sion] [-Z|--zeroy|n] PhysicalVolume [PhysicalVolume...]
pvcreate initializes PhysicalVolume for later use by the Logical Volume Manager (LVM).
Each PhysicalVolume can be a disk partition, whole disk, meta device, or loopback file.
For DOS disk partitions, the partition id should be set to 0x8e using fdisk(8), cfdisk(8),
or a equivalent. For whole disk devices only the partition table must be erased, which
will effectively destroy all data on that disk. This can be done by zeroing the first
dd if=/dev/zero of=PhysicalVolume bs=512 count=1
Continue with vgcreate(8) to create a new volume group on PhysicalVolume, or vgextend(8)
to add PhysicalVolume to an existing volume group.
See lvm(8) for common options.
Force the creation without any confirmation. You can not recreate (reinitialize) a
physical volume belonging to an existing volume group. In an emergency you can
override this behaviour with -ff.
-u, --uuid uuid
Specify the uuid for the device. Without this option, pvcreate generates a random
uuid. All of your physical volumes must have unique uuids. You need to use this
option before restoring a backup of LVM metadata onto a replacement device - see
Answer yes to all questions.
-Z, --zero y|n
Whether or not the first 4 sectors (2048 bytes) of the device should be wiped. If
this option is not given, the default is to wipe these sectors unless either or
both of the --restorefile or --uuid options were specified.
NEW METADATA OPTIONS
LVM2 introduces a new format for storing metadata on disk. This new format is more effi-
cient and resilient than the format the original version of LVM used and offers the
advanced user greater flexibility and control.
The new format may be selected on the command line with -M2 or by setting format = "lvm2"
in the global section of lvm.conf. Each physical volume in the same volume group must use
the same format, but different volume groups on a machine may use different formats simul-
taneously: the tools can handle both formats. Additional formats can be added as shared
Additional tools for manipulating the locations and sizes of metadata areas will be writ-
ten in due course. Use the verbose/debug options on the tools to see where the metadata
areas are placed.
The approximate amount of space to be set aside for each metadata area. (The size
you specify may get rounded.)
The number of metadata areas to set aside on each PV. Currently this can be 0, 1
or 2. If set to 2, two copies of the volume group metadata are held on the PV, one
at the front of the PV and one at the end. If set to 1 (the default), one copy is
kept at the front of the PV (starting in the 5th sector). If set to 0, no copies
are kept on this PV - you might wish to use this with VGs containing large numbers
of PVs. But if you do this and then later use vgsplit you must ensure that each VG
is still going to have a suitable number of copies of the metadata after the split!
In conjunction with --uuid, this extracts the location and size of the data on the
PV from the file (produced by vgcfgbackup) and ensures that the metadata that the
program produces is consistent with the contents of the file i.e. the physical
extents will be in the same place and not get overwritten by new metadata. This
provides a mechanism to upgrade the metadata format or to add/remove metadata
areas. Use with care. See also vgconvert(8).
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.
Overrides the automatically-detected size of the PV. Use with care.
Initialize partition #4 on the third SCSI disk and the entire fifth SCSI disk for later
use by LVM:
pvcreate /dev/sdc4 /dev/sde
lvm(8), vgcreate(8), vgextend(8), lvcreate(8), cfdisk(8), fdisk(8), losetup(8), mdadm(8),
Sistina Software UK LVM TOOLS 2.02.44-cvs (02-17-09) PVCREATE(8)