[root@centos mapper]# pvchange -u /dev/hda2
  Found duplicate PV s4Wh4CVy3SL77NEg0NEVwZ99U6pEH9Rv: using /dev/hdb2 not /dev/hda2
  Unable to find /dev/hda2 in VolGroup00
  0 physical volumes changed / 0 physical volumes not changed
  Internal error: Volume Group VolGroup00 was not unlocked
  Device '/dev/hdb2' has been left open.
  Device '/dev/hda2' has been left open.
  Device '/dev/hda2' has been left open.
  Device '/dev/hda2' has been left open.
  Device '/dev/hdb2' has been left open.
  You have a memory leak (not released memory pool):
   [0x9a8bcd8]
  You have a memory leak (not released memory pool):
   [0x9a8bcd8]

[root@centos mnt]# pvscan
  Found duplicate PV s4Wh4CVy3SL77NEg0NEVwZ99U6pEH9Rv: using /dev/hdb2 not /dev/hda2
  PV /dev/hdb2   VG VolGroup00   lvm2 [49.88 GB / 0    free]
  Total: 1 [49.88 GB] / in use: 1 [49.88 GB] / in no VG: 0 [0   ]

[root@centos mnt]# vgscan
  Reading all physical volumes.  This may take a while...
  Found duplicate PV s4Wh4CVy3SL77NEg0NEVwZ99U6pEH9Rv: using /dev/hdb2 not /dev/hda2
  Found volume group "VolGroup00" using metadata type lvm2

[root@centos mnt]# lvscan
  Found duplicate PV s4Wh4CVy3SL77NEg0NEVwZ99U6pEH9Rv: using /dev/hdb2 not /dev/hda2
  ACTIVE            '/dev/VolGroup00/LogVol00' [47.88 GB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [2.00 GB] inherit

[root@centos mnt]# mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw,grpquota,usrquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hdb1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

[root@centos mnt]# mount /dev/hda2 /mnt/a2
mount: you must specify the filesystem type
[root@centos mnt]# mount /dev/hda2 /mnt/a2 -t ext3
mount: wrong fs type, bad option, bad superblock on /dev/hda2,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so