Re: iSCSI: Canonical Targets

[Mark Bakke <mbakke@cisco.com>]

Stephen Bailey wrote:
> 
> Jim,
> 
> > I have a question for you (and the list) about a long Text response (as
> > might be needed for SendTargets).  Can the Text response come in multiple
> > PDUs?
> 
> As I interpret the spec (emphasis on interpret---I don't think the
> spec says anything clearly one way or another), yes.
>
> > In particular, can one "key=value" pair span multiple PDUs?
> 
> Not as I interpret the spec.
> 
> > And if so, does this help address your resources concerns?
> 
> No.  The problem I'm talking about is handling an unbounded TOTAL
> amount of data returned from a single request.  It doesn't matter
> whether it comes in a single PDU or broken into a million, unless you
> can offer a finer grain of flow control for the million PDUs than for
> the one.  In either case the data returned may a) clog the channel b)
> possibly consume resources necessary for other operational purposes.
> 
> Again, if we disallow SendTargets (and other interactions with
> indeterminate, potentially large uncontrolled flows) in an operational
> login, we can allow the transport to provide the flow control.  In an
> operational login we don't want to engage transport flow control in
> this way because it interferes with other operational communication.

This would simplify things a lot.  I started another thread on
iterating SendTargets, with what I think I heard from the interim
meeting.  If we can keep SendTargets out of the operational sessions,
perhaps we don't need to iterate.

> 
> Steph

-- 
Mark A. Bakke
Cisco Systems
mbakke@cisco.com
763.398.1054