Manage Volume Groups2024/05/29

	This is the basic operation of managing Volume Groups. It needs to create Physical Volume first.
[1]	Create Volume Group.

root@dlp:~#

vgcreate vg_dlp /dev/sdb1

Volume group "vg_dlp" successfully created

# specify like follows if you'd like to use multiple devices

root@dlp:~#

vgcreate vg_dlp /dev/sdb1 /dev/sdd1

Volume group "vg_dlp" successfully created

[2]	Display Volume Groups.

root@dlp:~#

vgdisplay vg_dlp

  --- Volume group ---
  VG Name               vg_dlp
  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               <80.00 GiB
  PE Size               4.00 MiB
  Total PE              20479
  Alloc PE / Size       0 / 0
  Free  PE / Size       20479 / <80.00 GiB
  VG UUID               VgQGGC-K6uM-WNc0-p8aU-1hgY-LYcu-hgZ0GO

[3]	Change Volume Group's name.

root@dlp:~#

vgrename vg_dlp vg_data

  Volume group "vg_dlp" successfully renamed to "vg_data"

root@dlp:~#

vgdisplay vg_data

  --- Volume group ---
  VG Name               vg_data
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  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               <80.00 GiB
  PE Size               4.00 MiB
  Total PE              20479
  Alloc PE / Size       0 / 0
  Free  PE / Size       20479 / <80.00 GiB
  VG UUID               VgQGGC-K6uM-WNc0-p8aU-1hgY-LYcu-hgZ0GO

[4]	Display reports of Volume Groups.

root@dlp:~#

vgs

  VG        #PV #LV #SN Attr   VSize   VFree
  ubuntu-vg   1   1   0 wz--n- <78.00g      0
  vg_data     1   0   0 wz--n- <80.00g <80.00g

[5]	Scan Volume Groups.

root@dlp:~#

vgscan

  Found volume group "vg_data" using metadata type lvm2
  Found volume group "ubuntu-vg" using metadata type lvm2

[6]	Extend Volume Group.

# add sdc1 to vg_data

root@dlp:~#

vgextend vg_data /dev/sdc1

  Volume group "vg_data" successfully extended

root@dlp:~#

vgdisplay vg_data

  --- Volume group ---
  VG Name               vg_data
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               159.99 GiB
  PE Size               4.00 MiB
  Total PE              40958
  Alloc PE / Size       0 / 0
  Free  PE / Size       40958 / 159.99 GiB
  VG UUID               VgQGGC-K6uM-WNc0-p8aU-1hgY-LYcu-hgZ0GO

[7]	Reduce Volume Group.

# remove sdc1 from vg_data

root@dlp:~#

vgreduce vg_data /dev/sdc1

  Removed "/dev/sdc1" from volume group "vg_data"

root@dlp:~#

vgdisplay vg_data

  --- Volume group ---
  VG Name               vg_data
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  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               <80.00 GiB
  PE Size               4.00 MiB
  Total PE              20479
  Alloc PE / Size       0 / 0
  Free  PE / Size       20479 / <80.00 GiB
  VG UUID               VgQGGC-K6uM-WNc0-p8aU-1hgY-LYcu-hgZ0GO

[8]	Delete Volume Group.

# disable target volume group first and delete it

root@dlp:~#

vgchange -a n vg_data

  0 logical volume(s) in volume group "vg_data" now active

root@dlp:~#

vgremove vg_data

  Volume group "vg_data" successfully removed

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