[T10] Bug in Third-party Copy VPD page

Dennis Appleyard dennis.appleyard at oracle.com
Wed Jan 27 13:58:04 PST 2016

Hi Ralph,

My interpretation has always been that the MAXIMUM SEGMENT LENGTH field 
is 4 bytes long. The byte numbering in the byte column makes that clear. 
Oracle has implemented the field as 4 bytes long.

Dennis Appleyard

Ralph Weber wrote:
> In the General Copy Operations third-party copy descriptor of the 
> Third-party Copy VPD page SPC-5 r08 through at least SPC-4 r37a have 
> inconsistently represented the size of the MAXIMUM SEGMENT LENGTH 
> field. Depending on whether one reads the bytes column of the field 
> format notation, the field is either 4 bytes (per the bytes column) or 
> 2 bytes (per the black and white reading of the field format notation).
> An excerpted copy of the table with the problem highlighted is 
> available in:
> http://www.t10.org/cgi-bin/ac.pl?t=d&f=16-054r0.pdf
> The editorial fix is to declare the field to be 4 bytes in size and 
> fix the field format accordingly.
> If the field is intended to be 2 bytes, then a change proposal will be 
> required since additional changes will be required to maintain the 
> descriptor's total size.
> Comments are hereby solicited from those who have implemented the 
> Third-party Copy VPD page.
> All the best,
> .Ralph
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