pvcreate <root
PVCREATE(8)                          System Manager's Manual                          PVCREATE(8)

NAME
       pvcreate — initialize a disk or partition for use by LVM

SYNOPSIS
       pvcreate  [--commandprofile  ProfileName]  [-d|--debug] [-h|--help] [-t|--test] [-v|--ver‐
       bose] [--version] [-f[f]|--force [--force]] [-y|--yes] [--labelsector]  [--bootloaderarea‐
       size  size] [-M|--metadatatype type] [--[pv]metadatacopies NumberOfCopies] [--metadatasize
       size] [--metadataignore {y|n}] [--dataalignment alignment]  [--dataalignmentoffset  align‐
       ment_offset]   [--restorefile   file]   [--norestorefile]  [--setphysicalvolumesize  size]
       [-u|--uuid uuid] [-Z|--zero {y|n}] PhysicalVolume [PhysicalVolume...]

DESCRIPTION
       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
       sector with:

       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.

OPTIONS
       See lvm(8) for common options.

       -f, --force
              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(8) generates a ran‐
              dom  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  vgcfgrestore(8).   As  such,  use  of  --restorefile  is compulsory unless the
              --norestorefile is used.

       -y, --yes
              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(5).  Each physical volume in the same volume group must
       use the same format, but different volume groups on a machine may  use  different  formats
       simultaneously:  the  tools  can  handle both formats.  Additional formats can be added as
       shared libraries.

       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.

       --metadatasize size
              The approximate amount of space to be set aside for each metadata area.  (The  size
              you specify may get rounded.)

       --dataalignment alignment
              Align  the start of the data to a multiple of this number.  You should also specify
              an appropriate PhysicalExtentSize when creating the Volume Group with vgcreate.

              To see the location of the first Physical Extent of an existing Physical Volume use
              pvs  -o +pe_start .  It will be a multiple of the requested alignment.  In addition
              it may be shifted  by  alignment_offset  from  data_alignment_offset_detection  (if
              enabled in lvm.conf(5)) or --dataalignmentoffset.

       --dataalignmentoffset alignment_offset
              Shift the start of the data area by this additional alignment_offset.

       --[pv]metadatacopies NumberOfCopies
              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(8) you must ensure that each
              VG  is  still  going  to have a suitable number of copies of the metadata after the
              split!

       --metadataignore {y|n}
              Ignore or un-ignore metadata areas on this physical volume.  The  default  is  "n".
              This  setting can be changed with pvchange.  If metadata areas on a physical volume
              are ignored, LVM will not store metadata in the  metadata  areas  present  on  this
              Physical  Volume.   Metadata areas cannot be created or extended after Logical Vol‐
              umes have been allocated on the device. If you do not want  to  store  metadata  on
              this  device,  it is still wise always to allocate a metadata area in case you need
              it in the future and to use this option to instruct LVM2 to ignore it.

       --restorefile file
              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).

       --norestorefile
              In conjunction with --uuid, this allows a uuid to be specified without also requir‐
              ing that a backup of the metadata be provided.

       --labelsector sector
              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.

       --bootloaderareasize size
              Create a separate bootloader area of specified size besides  PV's  data  area.  The
              bootloader  area  is  an  area of reserved space on the PV from which LVM2 will not
              allocate any extents and it's kept untouched. This is primarily aimed for use  with
              bootloaders  to embed their own data or metadata.  The start of the bootloader area
              is always aligned, see also --dataalignment and  --dataalignmentoffset.  The  boot‐
              loader  area  size  may  eventually end up increased due to the alignment, but it's
              never less than the size that is requested. To see the bootloader  area  start  and
              size of an existing Physical Volume use pvs -o +pv_ba_start,pv_ba_size.

       --setphysicalvolumesize size
              Overrides the automatically-detected size of the PV.  Use with care.

Examples
       Initialize  partition  #4  on the third SCSI disk and the entire fifth SCSI disk for later
       use by LVM:

       pvcreate /dev/sdc4 /dev/sde

       If the 2nd SCSI disk is a 4KiB sector drive  that  compensates  for  windows  partitioning
       (sector  7 is the lowest aligned logical block, the 4KiB sectors start at LBA -1, and con‐
       sequently sector 63 is aligned on a 4KiB boundary) manually account for this when initial‐
       izing for use by LVM:

       pvcreate --dataalignmentoffset 7s /dev/sdb

SEE ALSO
       lvm.conf(5),  lvm(8),  vgcreate(8),  vgextend(8),  lvcreate(8),  cfdisk(8), fdisk(8), los‐
       etup(8), mdadm(8), vgcfgrestore(8), vgconvert(8)

Sistina Software UK             LVM TOOLS 2.02.133(2) (2015-10-30)                    PVCREATE(8)

Go-to-top  




Designed by SanjuD(@ngineerbabu)

<>