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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|--verbose]   [--version]   [-f[f]|--force   [--force]]
       [-y|--yes]   [--labelsector]  [--bootloaderareasize  size]  [-M|--meta-
       datatype type]  [--[pv]metadatacopies  NumberOfCopies]  [--metadatasize
       size]     [--metadataignore    {y|n}]    [--dataalignment    alignment]
       [--dataalignmentoffset alignment_offset] [--restorefile file]  [--nore-
       storefile]  [--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 par-
       tition id should be set to 0x8e using fdisk(8), cfdisk(8), or a equiva-
       lent.  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  PhysicalVol-
       ume, 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 recre-
              ate (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,  pvcre-
              ate(8)  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 vgcfgrestore(8).  As such, use of --restorefile  is  compul-
              sory 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  efficient  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 set-
       ting format = "lvm2" in the global section of lvm.conf(5).  Each physi-
       cal  volume in the same volume group must use the same format, but dif-
       ferent volume groups on a machine may use different formats  simultane-
       ously:  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 written 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  meta-
              data 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  cre-
              ating 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 align-
              ment_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 Log-
              ical Volumes 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 con-
              sistent with the contents of the file i.e. the physical  extents
              will  be  in the same place and not get overwritten by new meta-
              data.  This provides a mechanism to upgrade the metadata  format
              or  to add/remove metadata areas. Use with care. See also vgcon-
              vert(8).

       --norestorefile
              In conjunction with --uuid, this allows a uuid to  be  specified
              without  also  requiring  that  a backup of the metadata be pro-
              vided.

       --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 boot-
              loader area is always  aligned,  see  also  --dataalignment  and
              --dataalignmentoffset.  The  bootloader 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 win-
       dows partitioning (sector 7 is the lowest aligned  logical  block,  the
       4KiB  sectors start at LBA -1, and consequently sector 63 is aligned on
       a 4KiB boundary) manually account for this when initializing 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), losetup(8), mdadm(8), vgcfgrestore(8), vgconvert(8)

Sistina Software UK   LVM TOOLS 2.02.111(2) (2014-09-01)           PVCREATE(8)

Czas wygenerowania: 0.00014 sek.


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