Jack Harper harper at
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.



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.

Jack Harper, President
Secure Outcomes Inc
2942 Evergreen Parkway, Suite 300
Evergreen, Colorado 80439 USA

303.670.3750 (fax) for Product Info. 

More information about the cctalk mailing list