===== Cannot create logical volumes =====
==== Error description ====
Althouh there is enough free space inside the affected LVM volume group no logical volumes can be created.
  root@kvm5:~# vgs
    VG   #PV #LV #SN Attr   VSize   VFree
    vg3    1  19   0 wz--n- 750.00g 430.00g
    vg     1   2   0 wz--n- 451.51g   1.51g
  
  root@kvm5:~# lvcreate -s -n nas_bkup -L 5G /dev/SCSI/nas
    Insufficient free space: 1280 extents needed, but only 0 available
==== Failure cause ====
The LVM volume group or the LVM physical device is in a state of 'inactive'.
==== Solution ====
The problem was solved by reactivating the LVM physical device:
  root@kvm5:~# pvchange -x y /dev/mapper/SCSI
    Physical volume "/dev/mapper/SCSI" changed
    1 physical volume changed / 0 physical volumes not changed
  root@kvm5:~# lvcreate -s -n nas_bkup -L 5G /dev/SCSI/nas
    Logical volume "nas_bkup" created
    
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