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Date: Sat, 13 Sep 97 14:03:39 -0400
From: curt@kcwc.com (Curt Welch)
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To: dag-erli@ifi.uio.no (Dag-Erling Coidan Smxrgrav)
Subject: Re: XP34550S / AHA2940UW refuses wide negotiation
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dag-erli@ifi.uio.no (Dag-Erling Coidan Smxrgrav) wrote:
>  I recently upgraded my Adaptec 2940 to a 2940UW to take full advantage
>  of my Quantum Atlas II. However, it seems that both the adapter and
>  the disk are refusing wide negotiation.

>  I am using both internal connectors on the SCSI adapter,
>  with the Atlas on the wide bus and a Conner 1080S and a
>  Toshiba 3801 on the narrow bus. "Enable wide negotiation"
>  is set to "Yes" (default) for all devices in the 2940UW
>  BIOS setup.

Relevant information from dmesg follows:

>  FreeBSD 2.2.1-RELEASE #0: Sun Aug 10 17:01:55 CEST 1997
>  [...]
>  ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 0 int a irq 9 on  
pci0:10
>  ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs

>  ahc0:A:0: refuses WIDE negotiation.  Using 8bit transfers
>  (ahc0:0:0): "CONNER CFP1080S 4649" type 0 fixed SCSI 2
>  sd0(ahc0:0:0): Direct-Access 1030MB (2110812 512 byte sectors)

>  (ahc0:2:0): "QUANTUM XP34550W LXY1" type 0 fixed SCSI 2
>  sd1(ahc0:2:0): Direct-Access 4341MB (8890760 512 byte sectors)

>  ahc0:A:5: refuses WIDE negotiation.  Using 8bit transfers
>  (ahc0:5:0): "TOSHIBA CD-ROM XM-3801TA 1047" type 5 removable SCSI 2
>  cd0(ahc0:5:0): CD-ROM can't get the size

It looks to me like the Quantum is working fine.  It's the Conner
and the CD-ROM that are refusing WIDE negotation.  I think you just
got confused by the order in which the messages come out.  Note
the device numbers.

> Is it caused by using narrow and wide devices on the same adapter?

No, that works fine.  I do it also.

> Why is the Atlas II reported as a SCSI 2 device rather than SCSI 3?

Don't know but that's how it works.  I think wide and maybe even ultra
speed devices are part of the SCSI 2 spec.  People have just come to
call wide SCSI-3 even though it isn't.  Don't know if the dirve
is SCSI-3 or not.  Maybe some of the SCSI experts on this list can
give us a lesson.

Curt