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SubjectRe: PATCH: Different SCSI ordering for WIDE SCSI chains.
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In message <19981201122758.A3415@wau.mis.ah.nl>, Paul Slootman writes:
+-----
| In article <3662D55D.A31769E5@airways.com> lancer@airways.com wrote:
| >When mixing narrow and wide devices you must only use the first eight
| >scsi ids. If you don't, scsi arbitration will not work correctly. The
| >scsi bus uses the data bits to arbitrate for the bus. A narrow device
|
| This is not true. Your narrow devices will simply see that they are not
| selected when one of the wide devices on address 8 and up is selected,
| and ignore it. As long as you keep your adapter on a low address, all
+--->8

IIRC, if the host adapter is issuing commands and then disconnecting, a
narrow device can send a response while a wide device is already talking on
the bus because it won't see the wide device, resulting in a collision.

--
brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net
system administrator [WAY too many hats] allbery@ece.cmu.edu
carnegie mellon / electrical and computer engineering KF8NH
Kiss my bits, Billy-boy.



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