[CentOS] unable to read partition table in log

[Scott Silva]

on 5-18-2009 1:04 PM P.A spake the following:
> 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.
> 

Does the system have memory card slots or a sd or cf reader? Some of those get
detected as a scsi drive, but fail like this.

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