[CentOS] LVM Input/output error

Hi,

I recently installed centos for the first time and I like it!

Also, I just started working with lvm.  The following warnings 
are genertated whenever I run one of lvm commands on the external 
usb disk (MyBook by Western Digital).

* What could be the source for those messages?
* Should I worry about them (writing into the created LV's
   seems to work)?
* If yes, how to fix them?

[root at frodo pilpel10]# uname -a
Linux frodo 2.6.9-34.0.1.ELsmp #1 SMP Wed May 24 05:28:30 CDT 2006 x86_64 x86_64 x86_64 GNU/Linux

Using lvm2 2.02.01-1.3

 	Thanks in advance,
 	Itay

<quote>
[root at frodo pilpel10]# vgcreate VGe1 /dev/sdc2
   /dev/dm-11: read failed after 0 of 4096 at 5242814464: Input/output error
   /dev/dm-11: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 54460416: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 216895782912: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 61203218432: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-11: read failed after 0 of 4096 at 5242814464: Input/output error
   /dev/dm-11: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 54460416: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 216895782912: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 61203218432: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 0: Input/output error
   Volume group "VGe1" successfully created
[root at frodo pilpel10]# pvscan
   /dev/dm-11: read failed after 0 of 4096 at 5242814464: Input/output error
   /dev/dm-11: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 54460416: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 216895782912: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 61203218432: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 0: Input/output error
   PV /dev/sdc2   VG VGe1   lvm2 [296.13 GB / 296.13 GB free]
   PV /dev/sda2   VG VG00   lvm2 [232.78 GB / 1.78 GB free]
   Total: 2 [528.91 GB] / in use: 2 [528.91 GB] / in no VG: 0 [0   ]
[root at frodo pilpel10]# lvcreate -L 202G -n LVbiogateBAK_home VGe1
   /dev/dm-11: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-12: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-14: read failed after 0 of 4096 at 0: Input/output error
   Logical volume "LVbiogateBAK_home" created
</quote>