By default the system volume group holds only one disk. If you tried to add another disk then you might be received like below error.

Existing space in system volume group

# vgs
  /dev/cdrom: open failed: No medium found
  VG     #PV #LV #SN Attr   VSize  VFree  
  applvg   1   1   0 wz--n- 40.68G 692.00M
  system   1   7   0 wz--n- 19.88G      0 

Error while trying to extend the system VG

# vgextend system /dev/sdb1
  /dev/cdrom: open failed: No medium found
  No space for '/dev/sdb1' - volume group 'system' holds max 1 physical volume(s).
  Unable to add physical volume '/dev/sdb1' to volume group 'system'.

Change the system VG value

# vgchange system -p 0
  Volume group "system" successfully changed

Now extending of system VG is successful

# vgextend system /dev/sdb1
  Volume group "system" successfully extended

Now you can notice in vgs and pvs that disk has been successully added to VG and PV.

# vgs
pv  VG     #PV #LV #SN Attr   VSize  VFree  
  applvg   1   1   0 wz--n- 40.68G 692.00M
  system   2   7   0 wz--n- 29.19G   9.31G
# pvs
  PV         VG     Fmt  Attr PSize  PFree  
  /dev/sda2  system lvm2 a--  19.88G      0 
  /dev/sdb1  system lvm2 a--   9.31G   9.31G
  /dev/sdb2  applvg lvm2 a--  40.68G 692.00M

 

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