Lesson 4.3: Assign physical volumes to volume groups

Case I: Create VG with the default PE

# Create a Volume Group
[root@server dev]# vgcreate loanvg /dev/nvme0n3
  Volume group "loanvg" successfully created
 
# Viewing  the Volume Group Information
[root@server dev]# vgdisplay loanvg 
  --- Volume group ---
  VG Name               loanvg
  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               <6.00 GiB
  PE Size               4.00 MiB
  Total PE              1535
  Alloc PE / Size       0 / 0   
  Free  PE / Size       1535 / <6.00 GiB
  VG UUID               TdeDuw-dDFu-iI4w-rFNs-QQse-Aye9-pu3gnr

Default PE SIZE is 4.00 MiB

Total PE = (Size of Physical volume) / Pe

Case II: Create VG with the specified PE Size

# Create VG with 16M PE Size
[root@server dev]# vgcreate -s 16M loanvg /dev/nvme0n3 
  Volume group "loanvg" successfully created
 
# View VG
[root@server dev]# vgdisplay loanvg 
  --- Volume group ---
  VG Name               loanvg
  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               5.98 GiB
  PE Size               16.00 MiB
  Total PE              383
  Alloc PE / Size       0 / 0   
  Free  PE / Size       383 / 5.98 GiB
  VG UUID               JB30qz-RgVz-cSlB-aegh-rj6d-oqXW-EaIgzs