[T10] FINISH ZONE commands that specify Sequential Or Before Required zones

Joe Breher joe at lingua-data.com
Sun Jun 9 11:21:19 PDT 2019

Hmmm. Seems to me like T13 did a boo-boo.

I could envision a zoned device implementation that has no issue in promptly finishing zones. Why punish the entire world (a word chosen deliberately) for the sins limitations of an implementation that does not optimize for this behavior? 

I note that initiators are free to not invoke such an operation, should they consider it to be too lengthy to be of benefit to them.

Joe Breher
lingua data, LLC
(478) 2-Breher
(478) 227-3437

> On Jun 9, 2019, at 10:14 AM, Ralph Weber <Ralph.Weber at wdc.com> wrote:
> The latest T13/ZAC-2 working draft prohibits FINISH ZONE EXT commands from requesting that Sequential Or Before Required zones be processed (with a suitable error, of course).
> There is no equivalent prohibition in T10/ZBC-2.
> The difference could be a timing anomaly (and T10 needs to play catchup), or it could be intentional.
> The T13 motivation for the prohibition was based on the (potentially very large) amounts of time required to do the writing necessary to finish Sequential Or Before Required zones.
> If a T10 consensus position can be observed on this reflector, then a revision of 19-056 <http://www.t10.org/cgi-bin/ac.pl?t=d&f=19-056.pdf> will be uploaded. Otherwise, this will be a CAP discussion topic during the consideration of 19-056.
> All the best,
> .Ralph
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