Persistent Reservations Service Actions
Bob.Snively at Ebay.Sun.COM
Fri Sep 25 14:22:01 PDT 1998
* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* Bob Snively <Bob.Snively at Ebay.Sun.COM>
I do not believe there is any reason to make any such changes.
The functions are identical in all respects. The only difference
is an editorial difference that moves some of the descriptive
detail to the model.
Additional text that has been added does not change the function,
but merely clarifies flaws in the original description.
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.
> Date: Wed, 23 Sep 1998 08:30:34 -0500
> To: "T10, Reflector" <T10 at symbios.com>
> CC: "Penokie, George" <gop at us.ibm.com>, "Snively, Bob" <Bob.Snively at Sun.COM>,
> "Coughlan, Tom" <tom.coughlan at digital.com>
> Persistent reservations are defined in SPC,
> a published ANSI standard. Proposal 98-203
> substantially changes the operation of persistent
> reservations. If 98-203 is approved, several
> reservation types will be made obsolete and the
> number of reservations per LUN will be reduced
> from one per initiator to just plain one.
> In consideration of these substantial changes,
> I believe that all service action codes on the
> PERSISTENT RESERVE IN and PERSISTENT RESERVE OUT
> commands documented in SPC must be made obsolete
> in SPC-2. 98-203 should propose specific, new
> (previously reserved) service action codes to
> the functions it defines.
> I believe changing the service action code values
> is critical to representing properly the magnitude
> of the changes proposed in 98-203. Furthermore,
> changing the service action codes is the only
> way to coordinate the initiator and target views
> of the functions being performed, there being no
> effective version in the SCSI command sets.
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