[CentOS] unable to read partition table in log

Hi recently I noticed in the messages log, the following error

 

May 18 15:59:52 mail kernel: sdb: assuming drive cache: write through

May 18 15:59:52 mail kernel: sdb : READ CAPACITY failed.

May 18 15:59:52 mail kernel: sdb : status=0, message=00, host=1, driver=00

May 18 15:59:52 mail kernel: sdb : sense not available.

May 18 15:59:52 mail kernel: sdb: assuming Write Enabled

May 18 15:59:52 mail kernel: sdb: assuming drive cache: write through

May 18 15:59:52 mail kernel:  sdb:<3>Buffer I/O error on device sdb, logical
block 0

May 18 15:59:52 mail kernel: Buffer I/O error on device sdb, logical block 0

May 18 15:59:52 mail last message repeated 5 times

May 18 15:59:52 mail kernel:  unable to read partition table

 

I'm not sure what sdb is since its not listed on my partition table

 

[root at mail srvadmin]# fdisk -l

 

Disk /dev/sda: 109.1 GB, 109196476416 bytes

255 heads, 63 sectors/track, 13275 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       13275   106527015   8e  Linux LVM

 

[root at mail srvadmin]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

                       99G   42G   52G  45% /

/dev/sda1              99M   44M   51M  47% /boot

none                  3.9G     0  3.9G   0% /dev/shm

[root at mail srvadmin]#

 

I looked at the hardware itself and all disk in this raid system are fine,
my question is, is this something I need to worry about and what is causing
this issue.

Although everything looking fine, my messages log is full of sdb complaints.

 

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