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SubjectRE: Strange SCSI behavior?
Date
The most common cause of Sense Key errors on DDS drives is
dirty heads. Try running a cleaning tape through the drive
a couple of times. No, once is not enough, from my experience.

Cheers,

Phil

---------------------------------------------
Phil Randal
Network Engineer
Herefordshire Council
Hereford, UK

> -----Original Message-----
> From: Cress, Andrew R [mailto:andrew.r.cress@intel.com]
> Sent: 17 August 2001 13:46
> To: 'lapham@extracta.com.br'; linux-kernel@vger.kernel.org
> Subject: RE: Strange SCSI behavior?
>
>
> Jon,
>
> You really need to know what the additional sense data shows.
> With DAT tapes often they have variable length block sizes
> and get errors
> from some UNIX commands as a result. Or, it may be something
> that could be
> fixed with a firmware update to the DAT drive, or a driver
> fix. It depends
> on the details. Is sd08:11 the DAT drive?
>
> Make sure
> CONFIG_SCSI_LOGGING=y
> CONFIG_SCSI_DEBUG=m (or =y)
> in your kernel, and issue
> echo "scsi log error 3" > /proc/scsi/scsi
> and rerun the tape backup to get more info.
>
> Andy
>
> -----Original Message-----
> From: Jon Lapham [mailto:lapham@extracta.com.br]
> Sent: Friday, August 17, 2001 8:27 AM
> To: linux-kernel@vger.kernel.org
> Subject: Strange SCSI behavior?
>
>
> Hello-
>
> I'm running a heavily used (~10-40 simultaneous users) NFS/smb/email
> server on which I recently installed a new SCSI HD (Atlas V
> 18GB). The
> system is a PIII 450, 256MB RAM, 2940U2W SCSI controller,
> running kernel
> v2.4.8 (but I've also tried older kernels as well) using the
> new aic7xxx
> driver, the fs is ext2.
>
> What I'm seeing is SCSI "sense key hardware Errors" on the new HD
> during tape backups (HPC1554 DDS-3 drive) scheduled at night
> (when the
> system is unused):
>
> SCSI disk error : host 0 channel 0 id 1 lun 0 return code = 8000002
> Info fld=0x214a55b, Current sd08:11: sense key Hardware Error
> I/O error: dev 08:11, sector 34907416
>
> Sounds like bad HD, right? Well, I've seen bad SCSI disks
> before, and
> this seems different. These messages *only* appear during
> tape backups,
> but not during the day when the machine is under *heavy*
> I/O load to
> that HD. It is *only* when the DAT tape gets involved that I
> see these
> messages. I should also say that files that correspond to
> the affected
> sectors in the error messages are fine, they are not corrupted.
>
> Suggestions? What can I do to track this down?
>
> TIA, Jon
>
> [root@office /root]# cat /proc/scsi/scsi
> Attached devices:
> Host: scsi0 Channel: 00 Id: 00 Lun: 00
> Vendor: SEAGATE Model: ST39175LW Rev: 0001
> Type: Direct-Access ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 01 Lun: 00
> Vendor: QUANTUM Model: ATLAS_V_18_WLS Rev: 0230
> Type: Direct-Access ANSI SCSI revision: 03
> Host: scsi0 Channel: 00 Id: 03 Lun: 00
> Vendor: HP Model: C1537A Rev: L708
> Type: Sequential-Access ANSI SCSI revision: 02
>
> [root@office /root]# cat /proc/scsi/aic7xxx/0
> Adaptec AIC7xxx driver version: 6.1.13
> aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/255 SCBs
> Channel A Target 0 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Goal: 40.000MB/s transfers (20.000MHz, offset 15, 16bit)
> Curr: 40.000MB/s transfers (20.000MHz, offset 15, 16bit)
> Channel A Target 0 Lun 0 Settings
> Commands Queued 760609
> Commands Active 0
> Command Openings 52
> Max Tagged Openings 253
> Device Queue Frozen Count 0
> Channel A Target 1 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Goal: 40.000MB/s transfers (20.000MHz, offset 63, 16bit)
> Curr: 40.000MB/s transfers (20.000MHz, offset 63, 16bit)
> Channel A Target 1 Lun 0 Settings
> Commands Queued 790561
> Commands Active 0
> Command Openings 64
> Max Tagged Openings 253
> Device Queue Frozen Count 0
> Channel A Target 2 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 3 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Goal: 10.000MB/s transfers (10.000MHz, offset 32)
> Curr: 10.000MB/s transfers (10.000MHz, offset 32)
> Channel A Target 3 Lun 0 Settings
> Commands Queued 3200334
> Commands Active 0
> Command Openings 1
> Max Tagged Openings 0
> Device Queue Frozen Count 0
> Channel A Target 4 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 5 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 6 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 7 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 8 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 9 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 10 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 11 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 12 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 13 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 14 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
> Channel A Target 15 Negotiation Settings
> User: 80.000MB/s transfers (40.000MHz, offset 255, 16bit)
>
>
>
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