Dave,

Despite the potential value of CISC to FCP operation in Class 3, we must advise against requiring or even recommending it.

In our interoperability testing, we have discovered there are devices with significant installed base that do not behave properly when actually presented with CISC.  Unfortunately, they do not reject an N_Port Login that offers CISC, so this problem is not discoverable.

Even recommending CISC in a standard would therefore increase the incidence of interoperability problems with use of Fibre Channel.

  - Bob Nixon, Emulex alternate representative

-----Original Message-----
From: t11_3-bounces@listserve.com [mailto:t11_3-bounces@listserve.com]On Behalf Of David Peterson
Sent: Sunday, October 08, 2006 12:34 PM
To: t10@t10.org
Cc: t11_3@t11.org
Subject: [T11.3] FCP-4: Continuously Increasing SEQ_CNT

Howdy All,

At the last FCP-4 working group meeting I presented a proposal to request the use of continuously increasing SEQ_CNT (CISC) for Class 3 service.

While most believe requiring continuously increasing SEQ_CNT for Class 3 service is a good idea, one vendor indicated that none of their implementations support CISC, and another vendor was concerned about the requirement.

As such, we have the following options:

a. require CISC for Class 3 service. This means that existing implementations can claim compliance to a prior standard (e.g., FCP-3);
b. specify that CISC should be used for Class 3 service;
c. no change (i.e., CISC is not required except for streamed Sequences).

My preference would be option a.

What say ye?

...Dave

(no disclaimer)

---

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