Manage Volume Groups2016/09/12

	This is the basic operation of managing Volume Groups. It needs to create Phisical 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               Q3c0yC-ZgGf-E0aX-tZsv-wLe8-DETH-XDqPER

[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               Q3c0yC-ZgGf-E0aX-tZsv-wLe8-DETH-XDqPER

[4]	Display reports of Volume Groups.

root@dlp:~#

vgs

  VG      #PV #LV #SN Attr   VSize  VFree
  centos    1   2   0 wz--n- 49.51g     0
  vg_data   1   0   0 wz--n- 80.00g 80.00g

[5]	Scan Volume Groups.

root@dlp:~#

vgscan

  Reading all physical volumes.  This may take a while...
  Found volume group "centos" using metadata type lvm2
  Found volume group "vg_data" 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  4
  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               160.00 GiB
  PE Size               4.00 MiB
  Total PE              20479
  Alloc PE / Size       0 / 0
  Free  PE / Size       20479 / 160.00 GiB
  VG UUID               Q3c0yC-ZgGf-E0aX-tZsv-wLe8-DETH-XDqPER

[7]	Reduce Volume Group.

# remove sdc1 from vg_data

root@dlp:~#

vgreduce vg_data /dev/sdc1

Removed "/dev/sdd1" 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  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               Q3c0yC-ZgGf-E0aX-tZsv-wLe8-DETH-XDqPER

[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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