Adaptec 29160N errors

[whizkid at ValueDJ.com]

here are the errors from the messages log.  This ONLY happened when A) a
device was connected to the Adaptec 29160N and B) when the device was
being used by dump.  According the the replies I am afraid the problem may
be related to the MB..  And ideas on how to trouble shoot it?  For some
reason this error no longer occurs with the AHA-2940.  Could it be some
IRQ conflict?  I know that the SCSI controller used IRQ 11, as do alot of
the other devices on the system..

ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x16b
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x16b
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x8
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x9
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x82
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: PCI error Interrupt at seqaddr = 0x16b
ns1 kernel: ahc0: Data Parity Error Detected during address or write data
phase
ns1 kernel: ahc0: WARNING WARNING WARNING WARNING
ns1 kernel: ahc0: Too many PCI parity errors observed as a target.
ns1 kernel: ahc0: Some device on this bus is generating bad parity.
ns1 kernel: ahc0: This is an error *observed by*, not *generated by*, this
controller.
ns1 kernel: ahc0: PCI parity error checking has been disabled.
ns1 kernel: ahc0: WARNING WARNING WARNING WARNING