LVM : Manage Volume Groups2021/07/20

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

[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               Zfj9Go-G0qK-qhVe-HVYi-SbeB-EX5X-w3VHrE

[3]	Change Volume Groups' 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               Zfj9Go-G0qK-qhVe-HVYi-SbeB-EX5X-w3VHrE

[4]	Display reports of Volume Groups.

[root@dlp ~]#

vgs

  VG      #PV #LV #SN Attr   VSize   VFree
  rl        1   2   0 wz--n- <29.00g      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 "rl" using metadata type lvm2

[6]	Extend Volume Groups.

# 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               Zfj9Go-G0qK-qhVe-HVYi-SbeB-EX5X-w3VHrE

[7]	Reduce Volume Groups.

# 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               Zfj9Go-G0qK-qhVe-HVYi-SbeB-EX5X-w3VHrE

[8]	Delete Volume Groups.

# 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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