unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (Debian-3.1)
Page:
Section:
Apropos / Subsearch:
optional field

PVCREATE(8)                 System Manager's Manual                PVCREATE(8)



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

SYNOPSIS
       pvcreate  [-d|--debug] [-f[f]|--force [--force]] [-y|--yes] [-h|--help]
       [-t|--test]  [-v|--verbose]   [--labelsector]   [-M|--metadatatypetype]
       [--metadatacopies#copies]    [--metadatasizesize]   [--restorefilefile]
       [--setphysicalvolumesizesize] [--version] [-Z|--zeroy/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, 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  vgcfgre-
              store(8).

       -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.  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 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.)

       --metadatacopies copies
              The number of metadata areas to set aside on each PV.  Currently
              this can be 0, 1 or 2.  If set to 2 (the default), 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, 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!

       --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).

       --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.

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

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

       pvcreate /dev/sdc4 /dev/sde


SEE ALSO
       lvm(8), vgcreate(8),  vgextend(8),  lvcreate(8),  cfdisk(8),  fdisk(8),
       losetup(8), mdadd(8), vgcfgrestore(8), vgconvert(8)



Sistina Software UK                LVM TOOLS                       PVCREATE(8)