SSC-4: Sequential-access device log page

Kevin D Butt kdbutt at
Mon Mar 1 07:51:53 PST 2010

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In the sequential access device log page (0Ch) there are several 
parameters defined where there is the use of the term "medium".  This has 
caused some confusion about whether the intent is to report values based 
on what has actually been committed to the medium or what has made it into 
the object buffer (e.g., during writes are the blocks that have 
successfully been received into the buffer part of the parameter or only 
those that have been flushed to medium).
The intent when I brought the proposal to add the parameters from 0004h on 
is that it be the logical state of the medium, not the committed state of 
the medium.  It is intended to be used as a gas gauge for the operations 
being processed.
Are there any objections to refining the wording to clarify this?
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at

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