[CentOS] mount old LVM drive

How can I mount an old LVM drive into a new system so I can view the old
files? I want to mount it as /mnt/backup


fdisk -l

Disk /dev/sda: 160.0 GB, 160000000000 bytes
255 heads, 63 sectors/track, 19452 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       19452   156143767+  8e  Linux LVM

Disk /dev/sdb: 160.0 GB, 160000000000 bytes
255 heads, 63 sectors/track, 19452 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          13      104391   83  Linux
/dev/sdb2              14       19452   156143767+  8e  Linux LVM

when I do

mount -t ext3 /dev/sdb2 /mnt/backup
mount: wrong fs type, bad option, bad superblock on /dev/sdb2,
       or too many mounted file systems

any help would be greatly appreciated!

Chuck
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