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

[Oliver Howe]

 ~]# ls -la /dev/sdd
brw-r----- 1 root disk 8, 48 Dec 14 12:27 /dev/sdd
 ~]# ls -la /dev/sdc
brw-r----- 1 root disk 8, 32 Dec 14 12:27 /dev/sdc
 ~]#

looks like they got created yesterday when the server rebooted


 ~]# fdisk -l /dev/sdc
Disk /dev/sdc: 20 MB, 20971520 bytes
64 heads, 32 sectors/track, 20 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
   Device Boot      Start         End      Blocks   Id  System
 ~]#
 ~]# fdisk -l /dev/sdd
 ~]#






On Wed, Dec 15, 2010 at 3:59 PM, James Courtier-Dutton <
james.dutton at gmail.com> wrote:

>  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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>
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