[T11.3] FCP-4: Continuously Increasing SEQ_CNT

Craig W. Carlson craig.carlson at qlogic.com
Mon Oct 16 08:19:13 PDT 2006

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I¹d have to agree with Bob on this one.  We are aware of devices which
cannot support CISC, and which would seriously break if presented with it.
A change such as this (either a or b) could create havoc with device
On 10/13/06 6:08 PM, "Bob.Nixon at Emulex.Com" <Bob.Nixon at Emulex.Com> wrote:
> 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
> 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
> interoperability problems with use of Fibre Channel.
>    - Bob Nixon, Emulex alternate representative
> -----Original Message-----
> From: t11_3-bounces at listserve.com [mailto:t11_3-bounces at listserve.com]On
> Behalf Of David Peterson
> Sent: Sunday, October 08, 2006 12:34 PM
> To: t10 at t10.org
> Cc: t11_3 at 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
> 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
> 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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Craig W. Carlson		   mailto:craig.carlson at qlogic.com
QLogic Corporation				    (952) 932-4064
6321 Bury Drive
Eden Prairie, MN 55346

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