Persistent Reservations Service Actions

Bob Snively Bob.Snively at Ebay.Sun.COM
Mon Sep 28 09:47:06 PDT 1998

* From the T10 (formerly SCSI) Reflector (t10 at, posted by:
* Bob Snively <Bob.Snively at Ebay.Sun.COM>

A better way is to make the unused functionality obsolete, thereby
preserving those already existing applications that have chosen to
implement exactly the subset of persistent reservation functionality
that is being more clearly explained in SPC-2.  In addition, it
allows those applications that may possibly have used some of the
less popular features of SPC to continue their compliance with the
present document.

That means that we probably should not withdraw SPC when we bring
SPC-2 into publication, but that is probably what we would do for 
other reasons anyway.


> Date: Fri, 25 Sep 1998 17:56:06 -0500
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> To: T10 at
> CC: Bob Snively <Bob.Snively at Ebay>, gop at, Bob.Snively at Sun.COM, 
tom.coughlan at
> Subject: Re: Persistent Reservations Service Actions
> Content-Transfer-Encoding: 7bit
> } If we have done this correctly (and I know of no place where we
> } have not) this is a simple and perfect subset of the original SPC-2
> } that obsoletes functions that were originally included for symmetry
> } but were never required by any persistent reservation implementations.
> ... never required by any persistent reservation implementations
> As I was reminded in regards to a certain Standard Inquiry data bit,
> SPC is a published standard that defines all the capabilities that
> the committee is in the process of discarding and/or rendering
> obsolete in this 'subset' of the SPC capabilities.  The committee's
> duty to those who read the published standard but do not attend
> the meetings is to make changes that preserve published behavior
> or make the differences obvious to entities implemented against
> the published standard.
> Changing the service action codes is one way to discharge the
> committee's duty.  In terms of resources accessible to SPC-2,
> it is a low-cost option.  There may be other options, I do not
> claim to have exhausted the list.
> Ralph...

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