Messages in this thread | | | Subject | Re: PATCH: Different SCSI ordering for WIDE SCSI chains. | Date | Tue, 01 Dec 1998 17:47:06 -0500 | From | "Brandon S. Allbery KF8NH" <> |
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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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