IGNORE WIDE RESIDUE Message
Brian A. Berg
bberg at bswd.com
Fri Nov 27 07:16:35 PST 1998
* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* bberg at bswd.com (Brian A. Berg)
*
Norbert:
Since it is not possible to know the number of bytes that will ACTUALLY
get transferred by a SCSI command, this message is indeed necessary.
In other words, the transfer count is what is requested, but not
necessarily what is experienced. I have found this message to be
particularly important with tape drives.
___________________________________________________________________
Brian A. Berg bberg at bswd.com Voice: 408.741.5010
Berg Software Design FAX: 408.741.5234
P.O. Box 3488 http://www.bswd.com/
14363 Saratoga Ave., Suite 200 Consulting: SCSI, storage, I/O
Saratoga, CA 95070 USA
> * From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
> * "Norbert Lewalski" <norbert_lewalski at vortex.de>
> *
> IGNORE WIDE RESIDUE message has been defined in the SCSI-2
> specification and is also part of the SCSI-3 specification. As we
> have never seen such a message being sent by a target we wonder if
> anyone has ever made use of this message or will do so in the future.
>
> If wide transfer has been negotiated between initiator and target and
> transfer count is an odd number of bytes, then the message is not
> required as both sides know that the high byte of the last word
> transfered must be ingnored.
>
> If wide transfer has been negotiated and transfer count is an even
> number of bytes, then why should the target disrupt the transfer at
> an odd number of bytes?
>
> Regards,
> Norbert Lewalski
>
>
>
> *****************************************************************
> Norbert Lewalski Phone: +49-(0)7131-59720
> ICP vortex Computersysteme GmbH Fax: +49-(0)7131-255063
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> 74223 Flein WWW: http://www.icp-vortex.com
> Germany
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