[Gllug] I/O messages for non existant device?

[James Courtier-Dutton]

On 15 December 2010 11:58, Oliver Howe <ojhowe at gmail.com> wrote:
>
>
> I'm seeing the following error messages in my /var/log/messages file
> regarding devices sdc and sdd but I dont see those devices when I do a df,
> or look in the mtab file
>
>
> Buffer I/O error on device sdc, logical block 11
> end_request: I/O error, dev sdc, sector 48
> ..
> end_request: I/O error, dev sdd, sector 25382150136
> end_request: I/O error, dev sdd, sector 0
>
> etc
>
> but, I cant see these discs in /etc/mtab
>
>  ~]# grep sdc /etc/mtab
>  ~]# grep sdd /etc/mtab
>  ~]#
> or by doing df
>
>  ~]# df | grep sdd
>  ~]# df | grep sdc
>
>
> does that mean the error is referring to a disc that maybe is in the
> attached disk array and is not being used?
> could this bring the system down if the disc failes totally?
>

df only shows mounted devices.
sdd could be any block device. E.g. CDROM, USB stick, iPOD etc.

fdisk -l /dev/sdc
fdisk -l /dev/sdd

might give you some idea as to what sort of device it is.
But it will give bogus output if the block device does not have a
partition table.

ls -l /dev/disk/by-id

might give you an idea where the sdc and sdd came from.
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