Comments on 09-250r2: SPC-4 Change power condition timer behavior when commands are received

Kevin D Butt kdbutt at
Tue Sep 29 12:09:55 PDT 2009

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In 09-250r2 under the REQUEST SENSE command I think that the changes are a 
little more than what you have.
Before the changes made earlier in the proposal, the timers were stopped 
for the processing of the Request Sense command and then restarted.  Also, 
the previous text implies that the power condition may have changed for 
processing the command.  After the changes in this proposal, the Request 
Sense command is processed in parallel with any power condition timers 
that are running and the state upon the completion of the Request Sense 
command is not necessarily the same power condition state as when the 
command was enabled.  Rather, the power condition state transitions are 
not effected by the REQUEST SENSE command and a state transition may have 
occurred during the processing of the command.
I suggest the following wording to replace the paragraph listed in the 
Processing a REQUEST SENSE command shall not have an effect on the power 
condition of the logical unit. A REQUEST SENSE command shall not reset any 
power condition timers.
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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