Adaptec AHA-2940U2W "Data Parity Error Dectected" messages

Adaptec AHA-2940U2W "Data Parity Error Dectected" messages

[Daniel Pittman]

I recently installed a SCSI tape drive and Adaptec AHA-2940U2W SCSI
controller into my server to run backups.

Since then, the driver issues these warnings on a semi-regular basis
while the drive is busy:

Aug  9 17:00:26 anu kernel: scsi0: Data Parity Error Detected during address or write data phase
Aug  9 17:00:26 anu kernel: scsi0: PCI error Interrupt at seqaddr = 0x8

[...]

Aug  9 17:03:34 anu kernel: scsi0: Data Parity Error Detected during address or write data phase

[...]

Aug  9 17:04:36 anu kernel: scsi0: PCI parity error checking has been disabled.
Aug  9 17:04:36 anu kernel: scsi0: Some device on this bus is generating bad parity.
Aug  9 17:04:36 anu kernel: scsi0: This is an error *observed by*, not *generated by*, this controller.
Aug  9 17:04:36 anu kernel: scsi0: Too many PCI parity errors observed as a target.
Aug  9 17:04:36 anu kernel: scsi0: WARNING WARNING WARNING WARNING


Now, the log message claims that the SCSI controller is not responsible
for these parity errors, so my questions are:

* should I panic about this?
* should I have seen this before the SCSI controller was installed?
* can I do anything about it, or identifying the cause?

Thanks,
      Daniel

Re: Adaptec AHA-2940U2W "Data Parity Error Dectected" messages

[Lee Revell]

On Tue, 2005-08-09 at 17:19 +1000, Daniel Pittman wrote:
> I recently installed a SCSI tape drive and Adaptec AHA-2940U2W SCSI
> controller into my server to run backups.
> 
> Since then, the driver issues these warnings on a semi-regular basis
> while the drive is busy:
> 
> Aug  9 17:00:26 anu kernel: scsi0: Data Parity Error Detected during address or write data phase
> Aug  9 17:00:26 anu kernel: scsi0: PCI error Interrupt at seqaddr = 0x8

Make sure the hardware is all installed correctly.  Check that the card
is fully seated, or try it in another PCI slot.  Also check your cabling
and termination.

Lee

Re: Adaptec AHA-2940U2W "Data Parity Error Dectected" messages

[Daniel Pittman]

Lee Revell <rlrevell@joe-job.com> writes:
> On Tue, 2005-08-09 at 17:19 +1000, Daniel Pittman wrote:
>> I recently installed a SCSI tape drive and Adaptec AHA-2940U2W SCSI
>> controller into my server to run backups.
>> 
>> Since then, the driver issues these warnings on a semi-regular basis
>> while the drive is busy:
>> 
>> Aug  9 17:00:26 anu kernel: scsi0: Data Parity Error Detected during address or write data phase
>> Aug  9 17:00:26 anu kernel: scsi0: PCI error Interrupt at seqaddr = 0x8
>
> Make sure the hardware is all installed correctly.  Check that the card
> is fully seated, or try it in another PCI slot.  

Thanks.  I will take the server down shortly and give that a shot.

> Also check your cabling and termination.

Could SCSI cabling and/or termination cause the card to report *PCI*
errors, or am I misunderstanding these messages?

I guess that the fact that the "PCI" bit kept showing up in them is
what confuses me.  I didn't except a SCSI card to report PCI bus issues
through the Linux driver, and since it claimed to be a victim, not a
cause, I didn't know quite how to trace the problem down...

Thanks,
      Daniel