CentOS 5
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Volume Group
2008/08/15
[1] Create a Volume Group
[root@ns ~]#
vgcreate VZ /dev/sdb1
 
# create a Volume group 'VZ'

  Volume group "VZ" successfully created

# insert a space like below if you specify some devices

[root@ns ~]#
vgcreate VZ /dev/sdb1 /dev/sdd1

  Volume group "VZ" successfully created
[2] Display Volume Groups
[root@ns ~]#
vgdisplay

  --- Volume group ---
  VG Name
VZ

  System ID
  Format
lvm2

  Metadata Areas
2

  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
2

  Act PV
2

  VG Size
227.89 GB

  PE Size
4.00 MB

  Total PE
58339

  Alloc PE / Size
0 / 0

  Free PE / Size
58339 / 227.89 GB

  VG UUID
AFGDj5-xi8k-e3JO-Sj0j-wVsx-pyA2-3MosMH
[3] Change name of Volume Group
[root@ns ~]#
vgrename VZ RX-7
# change current name 'VZ' to new name 'RX-7'


  Volume group "VZ" successfully renamed to "RX-7"
[root@ns ~]#
vgdisplay

  --- Volume group ---
  VG Name
RX-7
# changed

  System ID
  Format
lvm2

  Metadata Areas
2

  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
2

  Act PV
2

  VG Size
227.89 GB

  PE Size
4.00 MB

  Total PE
58339

  Alloc PE / Size
0 / 0

  Free PE / Size
58339 / 227.89 GB

  VG UUID
AFGDj5-xi8k-e3JO-Sj0j-wVsx-pyA2-3MosMH
[4] Output reports of Volume Groups
[root@ns ~]#
vgs

  VG
#PV
#LV
#SN
Attr
VSize
VFree

  VZ
2
0
0
wz--n-
227.89G
227.89G

  Xen
2
35
0
wz--n-
227.06G
84.06GG

[5] Scan Volume Groups
[root@ns ~]#
vgscan

  Reading all physical volumes. This may take a while...
  Found volume group "VZ" using metadata type lvm2
  Found volume group "Xen" using metadata type lvm2
[6] Extend a Volume Group
[root@ns ~]#
vgdisplay

  --- Volume group ---
  VG Name
VZ

  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
153.38 GB

  PE Size
4.00 MB

  Total PE
39266

  Alloc PE / Size
0 / 0

  Free PE / Size
39266 / 153.38 GB

  VG UUID
l4fisd-ke1o-E0HA-eICL-QuZN-jt30-652mC9


[root@ns ~]#
vgextend VZ /dev/sdd1
 
# add sdd1 in VZ

  Volume group "VZ" successfully extended
[root@ns ~]#
vgdisplay

  --- Volume group ---
  VG Name
VZ

  System ID
  Format
lvm2

  Metadata Areas
2

  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
2

  Act PV
2

  VG Size
227.89 GB

  PE Size
4.00 MB

  Total PE
58339

  Alloc PE / Size
0 / 0

  Free PE / Size
58339 / 227.89 GB

  VG UUID
l4fisd-ke1o-E0HA-eICL-QuZN-jt30-652mC9


[7] Reduce a Volume Group
[root@ns ~]#
vgreduce VZ /dev/sdd1
 
# remove sdd1 from VZ

  Removed "/dev/sdd1" from volume group "VZ"
[root@ns ~]#
vgdisplay

  --- Volume group ---
  VG Name
VZ

  System ID
  Format
lvm2

  Metadata Areas
1

  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
1

  Act PV
1

  VG Size
153.38 GB

  PE Size
4.00 MB

  Total PE
39266

  Alloc PE / Size
0 / 0

  Free PE / Size
39266 / 153.38 GB

  VG UUID
l4fisd-ke1o-E0HA-eICL-QuZN-jt30-652mC9
[8] Remove a Volume Group
[root@ns ~]#
vgchange -a n VZ
# make VZ non-active first

  0 logical volume(s) in volume group "VZ" now active
[root@ns ~]#
vgremove VZ
# remove VZ

  Volume group "VZ" successfully removed
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