[CentOS] unable to read partition table in log
Robert Heller
heller at deepsoft.com
Mon May 18 21:49:55 UTC 2009
At Mon, 18 May 2009 14:34:09 -0700 CentOS mailing list <centos at centos.org> wrote:
>
>
>
> 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
> >
> >
> >
> > Iâm 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.
So do any removable SCSI or USB disk devices (Zip drives, Orb drives, etc.).
Also any unformatted & unpartitioned USB mass storage devices will also
do this. This could include USB thumb drives that have somehow lost
their file system and/or partition table.
>
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--
Robert Heller -- 978-544-6933
Deepwoods Software -- Download the Model Railroad System
http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows
heller at deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/
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