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From: ridder@elvira.enet.dec.com (Hans Ridder)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A2091 PROBLEMS MUST BE RECOGNIZED! (Open letter to CBM)
Keywords: Anyone want to buy a A2500/30?
Message-ID: <2383@shodha.enet.dec.com>
Date: 25 Jan 91 18:00:47 GMT
References: <87541@tut.cis.ohio-state.edu> <51333@sequent.UUCP>
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Organization: Digital Equipment Corporation, Customer Support Center
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In article <51333@sequent.UUCP> cseaman@sequent.UUCP (Chris "The Bartman" Seaman) writes:
>I've heard sufficient reports from people at Commodore, as well as users,
>to believe that, when done properly, disabling reselect for ALL drives
>connected to the 2091 will correct the lock-up problem.

I don't want to get involved in the battle going on here, but I would
like to point out that while disabling reselection does seem to correct
*most* lock-up problems, it also has a significant impact on overall
SCSI bus performance.  Reslection isn't in the SCSI standard (and in
high-performance drives) just for the fun of it.  It allows SCSI devices
to release the bus during time consuming operations, such as seeking, so
that other devices have a chance.

With this in mind, I think that, in my opinion, disabling reselection
should be considered a *work around*, not a final fix.  We have been
told for a long time that a *fix* is in the works.  I hope to see it
soon, although I must admit that as time goes on, my hope does dwindle.

>Chris

-hans
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  Hans-Gabriel Ridder			Digital Equipment Corporation
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