[root@xen ~]# lvscan
  ACTIVE            '/dev/xen/Backup_Root' [4.00 GB] inherit
  ACTIVE            '/dev/xen/Backup_Swap' [256.00 MB] inherit
  ACTIVE            '/dev/xen/Backup_Backup' [60.00 GB] inherit
[root@xen ~]# fdisk /dev/xen/Backup_Root

Command (m for help): p

Disk /dev/xen/Backup_Root: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

               Device Boot      Start         End      Blocks   Id  System
/dev/xen/Backup_Root1   *           1          13      104391   83  Linux
/dev/xen/Backup_Root2              14         522     4088542+  8e  Linux LVM

Command (m for help): q

[root@xen ~]# pvscan
  PV /dev/md4   VG xen   lvm2 [130.75 GB / 66.50 GB free]
  Total: 1 [130.75 GB] / in use: 1 [130.75 GB] / in no VG: 0 [0   ]

[root@xen ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "xen" using metadata type lvm2