MODE SELECT SP bit question

Gerry Houlder gerry.houlder at seagate.com
Fri Jan 28 13:27:19 PST 2011


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1101285_f.htm">HTML-formatted message</a>

Yes, it is correct interpretation that all savable parameters in all mode
pages are saved when MODE SELECT with SP set to one is received.
On Fri, Jan 28, 2011 at 11:01 AM, Kevin D Butt <kdbutt at us.ibm.com> wrote:
> All,
>
> I was just surprised by one of my engineers telling me that the SP bit in
> the MODE SELECT command set to one indicates that ALL saveable mode
> parameters - not just those sent in this MODE SELECT command - are supposed
> to be saved.	I thought it meant to save the saveable parameters of those
> sent in this MODE SELECT command.  The text in SPC-4r29 states:
> <<An SP bit set to one specifies that the device server shall perform the
> specified MODE SELECT operation, and shall save
> to a nonvolatile vendor specific location all the saveable mode pages
> including any sent in the Data-Out Buffer.>>
>
> When I read this, I see the "including any sent in the Data-Out Buffer" and
> I have to conclude that my engineer is correct.
>
> Are we interpreting this correctly and should this be made more clear?
>
> Potential clarification
> <<An SP bit set to one specifies that the device server shall perform the
> specified MODE SELECT operation, and shall save
> to a nonvolatile vendor specific location all the saveable mode pages sent
> in the Data-Out Buffer and not sent in the Data-Out Buffer.>>
>
> Kevin D. Butt
> SCSI & Fibre Channel Architect, Tape Firmware
> Data Protection & Retention
> 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/



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