Si nécessaire :

# apt-get install lvm2

# pvcreate /dev/sda3  Physical volume "/dev/sda3" successfully created
#

“/dev/sda3” pourra être remplacé par “/dev/mda1” sans le cas d'un raid logiciel.

Pour voir le résultat :

# pvdisplay
  "/dev/sda3" is a new physical volume of "1,82 TiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda3
  VG Name               
  PV Size               1,82 TiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               glYidS-jRei-31RM-pTAQ-Hzjl-Iydk-Z2tbnu
#  

# vgcreate vg /dev/sda3
Volume group "vg" successfully created
#

Pour afficher le résultat :

# vgdisplay
  --- Volume group ---
  VG Name               vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1,82 TiB
  PE Size               4,00 MiB
  Total PE              476439
  Alloc PE / Size       0 / 0   
  Free  PE / Size       476439 / 1,82 TiB
  VG UUID               Vetofl-gQwV-Y7fN-BS38-xgiB-uDr6-ZP4Vtr
#