Attention Tape Vendors: Intepretation of Information Field Value after Space Command early termination

Zeitler, Carl Carl.Zeitler at COMPAQ.com
Mon Apr 19 06:58:22 PDT 1999


* From the T10 Reflector (t10 at symbios.com), posted by:
* "Zeitler, Carl" <Carl.Zeitler at COMPAQ.com>
*
Inserted below is the slide I showed at the FC-Tape Meeting on April 14.  I
was asked to distribute this slide on the appropriate reflectors for
response by Tape Vendors.  What is your interpretation of the value of the
Information Field after early termination of a Space Command with a negative
Count Field value (Back space)?  Please respond to the reflectors.  Thanks.
============================================================================
=========

INFORMATION FIELD VALUE AFTER  SPACE COMMAND EARLY TERMINATION



Page 44 of SSC Document, Revision 15, 2nd paragraph, last sentence:


A CHECK CONDITON caused by early termination of any SPACE command shall not
result in a negative information field value.

Change from SCSI 2.

Current Compaq interpretation  is:

		Forward Space:  

COUNT field  - (blocks, filemarks, setmarks spaced over) = Information field
value.

		5       -			   3
=             2	

	Backward Space

		-5     -			-(-3)
=	  -2


Is this interpretation correct?


If correct, need to modify and clarify the above sentence.

	Move sentence to end of first paragraph, to remove the possible
implication that it only applies to the filemarks case.


Regards,
Carl

Carl Zeitler
Compaq Computer Corporation
MS150801
20555 SH 249
Houston, TX 77070-2698
Room: CCA15 8 A74
Phone:  (281) 518-5258
Fax:       (281) 514-5270
E-Mail: Carl.Zeitler at compaq.com  



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