Re: PATCH: Different SCSI ordering for WIDE SCSI chains.

Brandon S. Allbery KF8NH (
Tue, 01 Dec 1998 17:47:06 -0500

In message <>, Paul Slootman writes:
| In article <> 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

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]
system administrator	     [WAY too many hats]
carnegie mellon / electrical and computer engineering			 KF8NH
			  Kiss my bits, Billy-boy.

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