SCSI
Jack Harper
harper at secureoutcomes.net
Tue Jan 23 11:40:28 CST 2018
Jim -
I appreciate the great SCSI information.
The hang is not at all frequent.
I do resets many times during a programming
session as my "marvelous" code hangs or otherwise
goes crazy and into thew weeds :) and I only
see a SCSI hang every few days.
Regards,
Jack
At 10:28 AM 1/23/2018, jim stephens wrote:
>Scsi controllers are very sensitive to resets
>and getting out of step with the state of the bus the initiators they control.
>
>Scsi can have multiple initiators, and you may
>of course have a system which acts as a target,
>but i'm guessing since you said drives, you have
>a pretty common setup, a system with drives
>attached, where the scsi device on your system is the initiator.
>
>One thing that throws off scsi is to do a reset
>which comes from somewhere the initiator doesn't
>know about. many are not friendly when that
>happens and just end up hung up. Reset tells
>all the devices to stand down, and it is
>expected that an enumeration of the bus will
>take place by all the initiator(s).
>
>That may have happened if you reset your other
>processors or did something which affected the
>initiator. And the resets on most systems
>usually hit all components, so I'd be surprised
>if only the one processor was affected.
>
>thanks
>Jim
----------------------------------------------------------------------------------
Jack Harper, President
Secure Outcomes Inc
2942 Evergreen Parkway, Suite 300
Evergreen, Colorado 80439 USA
303.670.8375
303.670.3750 (fax)
http://www.secureoutcomes.net for Product Info.
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