[T10] Tape Stream Miroring incorporation into SPC-5 r11 feedback

Ralph Weber roweber at ieee.org
Mon Aug 8 02:46:58 PDT 2016

With the following exceptions, the changes shown below have been marked 
for inclusion in SPC-4 r12.

  * The page 281 change is covered in a separate email.
  * On page 200, the editor prefers the e.g. because it allows a future
    proposal to define a second segment descriptor that starts a tape
    stream mirroring operation and not accidentally create letter ballot
    comment opportunities by forgetting to modify the cited text.
  * Regarding the TSMC bit discussion on page 201. Since the device is
    **always** the entity that sets the value in any VPD page bit, the
    editor is a big fan of removing "being set to one". To whit,
    requiring support for the bit is sufficient, which is what the
    modified text will say. Product specs and/or other mechanisms can
    define its value. Thank you to the reviewers for granting license to
    remove this text. It will be done.
  * The change proposed for page 280 will not be made because the cited
    sentence is the first sentence in the formal description of the tape
    stream mirroring segment descriptor. Especially in this location,
    the details which the proposed change would remove are essential to
    eliminating future claims that the standard is inconsistent.

All the best,


On 8/3/2016 9:32 PM, Dennis Appleyard wrote:
> Kevin,
> Thanks for the review.
> My comments are inline below.
> Dennis
> On 8/1/2016 1:09 PM, Kevin D Butt wrote:
>> Ralph, Dennis, and all,
>> I have 10 comments related to the incorporation of Tape Stream 
>> Mirroring into SPC-5r11. I included an fdf, but also wrote it out in 
>> text since I think Dennis can't do fdf's and I am not sure how an 
>> attached fdf will get processed by the reflector.
>> I admit, some of the comments are not strictly incorporation issues, 
>> so I have split them into one list of strictly incorporation issues, 
>> and one list that is more (and may need a proposal written if there 
>> is consensus that they should be changed)
>> *Strictly incorporation issues:*
>> On page 280, table 142, byte 8, there are missing vertical lines in 
>> the table.
> Agree
>> On page 281, fourth paragraph, "then the <<copy manager shall and 
>> device server shall>>establish a
>> deferred error condition with CHECK CONDITION status" I think there 
>> is something wrong with "copy manager shall and device server shall" 
>> The device server is the one to establish a deferred error. The copy 
>> manager has a requirement to terminate the copy operation which was 
>> just stated prior to the then, so what does the copy manager need to 
>> do here? I think, perhaps, the "copy manager shall and" should be 
>> deleted, but perhaps there was intent to have something here.
> I suggest changing to "then the copy  manager shall direct the device 
> server to establish a deferred error condition" This was the wording 
> in the proposal.
>> *Other issues:*
>> On page 200, third paragraph, I think the "e.g." should be an "i.e."
> Agree
>> On page 201, first paragraph, "SSC-5 or ADC-4" should be "SSC-5 and 
>> ADC-4".
> Agree
>> On page 201, first paragraph, "A sequential-access device that 
>> supports the tape stream mirroring copy
>> operation shall support the TSMC bit in the Sequential-access Device 
>> Capabilities VPD page (see SSC-5)being set to one." This is a VPD 
>> page. I think it should say "shall set ... to one" instead of "shall 
>> support ... being set to one"
> I think text should not be changed or should have "being set to one." 
> removed.
> The TSMC bit set to one indicates that the device is capable of tape 
> stream mirroring as set by a method outside the scope of the standard 
> (operator
> panel) or set by a Set Tape Stream Mirroring command from the ADC 
> interface when a library configures its drives. The TSMC bit set to 
> zero indicates that
> the device is not capable of tape stream mirroring because it knows 
> nothing about tape stream mirroring or that tape stream mirroring has 
> been made not available by a operator panel or the Set Tape Stream 
> Mirroring command from the ADC interface.
>> On page 204, row for 19h, "The equivalent affects of data transfer 
>> and positioning requested for the copy source shall be mirrored to 
>> the specified CSCD as equivalent data transfers and positioning 
>> requests to those processed for the copy source. Mirroring shall 
>> continue until stopped by the copy manager."
>>     1) The word "affects" should be "effects" and
> Agree
>>     2) "as equivalent data transfers and positioning requests to 
>> those processed for the copy source" actually detracts from the 
>> intent. I think the entire quoted text from "as" to the end of the 
>> sentence should be deleted.
> Agree
>> On page 280, first paragraph, "tape copy source" and "tape copy 
>> destination" should have the word "tape" deleted. There is already a 
>> requirement in third paragraph below the table to enforce the 
>> peripheral device type to be 01h.
> Agree
>> Kevin D. Butt
>> SCSI Architect, Tape Firmware, CAMSS
>> T10 Standards
>> MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
>> Tel: 520-799-5280
>> Fax: 520-799-2723 (T/L:321)
>> Email address: kdbutt at us.ibm.com
>> http://www-03.ibm.com/servers/storage/
>> From: Ralph Weber <roweber at ieee.org>
>> To: "T10, Reflector" <T10 at t10.org>
>> Date: 07/30/2016 18:32
>> Subject: [T10] SPC-5 r11 is available for download
>> Sent by: t10-bounces at t10.org
>> ------------------------------------------------------------------------
>> Incorporating all the proposals approved in Denver, SPC-5 r11 is not
>> available for your reading enjoyment.
>> http://www.t10.org/cgi-bin/ac.pl?t=f&f=spc5r11.pdf
>> Four substantive typos were discovered in data structure format tables
>> during the incorporation of 16-067r5 (PREPARE BINDING REPORT command).
>> All four were corrected by the editor, in consultation with the proposal
>> authors where necessary.
>> In recognition of the fact that programmers are known to implement by
>> reading only the pictures, a toe tag (aka Editor's note) has been
>> attached to each of the four miscreants. Anticipating that there will be
>> an SPC-5 r12, a proposal is being prepared to "do the right thing" with
>> the Editor's notes.
>> Two other major enhancements can be found in SPC-5 r11: SCSI Feature
>> Sets and Tape Stream Mirroring. Since the editor always reads and
>> sanity-corrects multi-page proposals, persons with passionate interests
>> are encouraged to open the PDF to see what glyphs hit the pages.
>> All the best,
>> .Ralph
>> _______________________________________________
>> T10 mailing list
>> T10 at t10.org
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