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SCSI problems with Qlogic ISP

>Hi -
>I've been seeing a lot of scsi errors recently on some of the drives
>attached to an alpha we have. All of these appear to be sense/parity
>errors of the form:
>scsi0 channel 0 : resetting for second half of retries.
>SCSI bus is being reset for host 0 channel 0.
>SCSI disk error : host 0 channel 0 id 2 lun 0 return code = 18000002
>[valid=0] Info fld=0x0, Current sd08:23: sense key Aborted Command
>Additional sense indicates Scsi parity error
>scsidisk I/O error: dev 08:23, sector 8913048
>We're running 4 drives + one tape drive off a QLogic 1020 ISP adapter
>(via a wide->narrow adapter). The total cable length exceeds 1.5m
>which I've seen elsewhere on the web as being the max length for this
>set up. The whole bus is terminated with an active terminator and the
>QLogic adapter is set to auto-terminate. We're running Debian 2.2,
>kernel 2.2.14 with the qlogicisp driver.
>Are these sort of errors indicative of cabling/termination problems or
>should I be looking elsewhere? If we swap around/replace the cables
>the drive id causing the error changes so I cant believe its a drive
>error. What worries me is the whole machine locks up solid after these
>errors and I dont know whether these errors should cause that...
>Any ideas?


This could be caused by bad cabling / termination.
You mention the use of a wide-->narrow convertor to
connect the tapedrive.
Does this adapter have "high byte termination" ?
(when you convert from wide(16 bit) to narrow(8 bit)
scsi , you need to terminate the upper 8 bits of the scsi bus.)
On the tapedrive (or the end of the lower 8 bits) you need to terminate
the lower 8 bits as well.

This setup could well confuse your auto termination too , maybe
you should try using a real terminator or setting jumpers on the
controller end too.


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