CentOS 8
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LVM : Manage Volume Groups2020/02/07
 
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               i21D9u-fman-ROdO-KEam-mjHj-5T9e-8CjD5I
[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               i21D9u-fman-ROdO-KEam-mjHj-5T9e-8CjD5I
[4] Display reports of Volume Groups.
[root@dlp ~]#
vgs 

  VG      #PV #LV #SN Attr   VSize   VFree
  cl        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 "cl" 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               i21D9u-fman-ROdO-KEam-mjHj-5T9e-8CjD5I
[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               i21D9u-fman-ROdO-KEam-mjHj-5T9e-8CjD5I
[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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