Re: Concensus Call on Urgent Pointer.

[David Robinson <David.Robinson@EBay.Sun.COM>]

I like the challenge and the way you put it.  But I would
also like to preface it with a better statement of
the "framing problem" we are trying to solve.  Some will
(and have) argued that simply placing the message
length in the iSCSI header is sufficient, the rest is
just a performance optimization and not all agree that
there is a performance problem, just an implementation
detail.

So lets clearly define the framing problem, agree it is a problem,
the argue solutions constructively as proposed below.

	-David

"HAAGENS,RANDY (HP-Roseville,ex1)" wrote:
> 
> I disagree with making a solution to the framing problem optional.
> 
> The framing problem is real.  Without a solution to it, iSCSI will fail.
> Failure is not an option.
> 
> Those who doubt the importance of finding a solution to the framing problem
> should argue that point directly, without trying to negate proposed
> solutions by making them optional.
> 
> Those who accept the framing problem, but disagree with the urgent pointer
> mechanism as a solution, can contribute constructively by (a) exhibiting an
> alternative solution; (b) fully explaining their reservations about use of
> the urgent pointer mechanism.
> 
> I myself am not yet convinced that the urgent pointer mechanism is a viable
> solution to the framing problem.  But I do applaud Matt's attempts to find a
> solution.
> 
> R
> 
> Randy Haagens
> Director, Networked Storage Architecture
> Storage Organization
> Hewlett-Packard Co.
> e-mail: Randy_Haagens@hp.com
> tel: +1 916 785 4578
> fax: +1 916 785 0391
> 
> -----Original Message-----
> From: Dick Gahan [mailto:Dick_Gahan@eur.3com.com]
> Sent: Friday, November 17, 2000 10:14 AM
> To: Daniel Smith
> Cc: ips@ece.cmu.edu
> Subject: Re: Concensus Call on Urgent Pointer.
> 
> I agree with Daniel smiths wording.
> 
> >"During login, if the target reqests use of the Urgent Pointer (UP) then
> >.this should be taken as meaning that the target will operate more
> >efficiently when the UP is used.  The initiator should make an effort to
> use
> >the UP.  If it is unable (or unwilling, because of user intervention*) to
> >use the UP then it must indicate its non-compliance to the target."
> 
> Neither the target or the initiator must support it but either or both can
> request it.
> The requested party does not have to support it to be complient.
> 
> Dick Gahan
> 3com
> 
> I apologize for the advertizing in my last memo - some MIS people have
> enabled
> this and I havn't had time
> to turn it off.
> 
> Dick
> 
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