09-085r1 Power Condition Transition modifications

Kevin D Butt kdbutt at us.ibm.com
Wed Apr 29 16:22:52 PDT 2009

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I have an issue with 09-085r1.	The suggested changes to SPC-4 assume that 
every device that uses power conditions and the power condition mode page 
support the START/STOP UNIT command and its controlling of power 
conditions.  Since this is in SPC-4 this applies to all devices including 
SSC (i.e., Tape) and SMC (i.e., library) devices and neither of these 
devices support START/STOP UNIT - nor can they because the opcode is 
LOAD/UNLOAD - whatever is proposed needs to make the distinction between 
those devices.	I don't know if the solution is to exclude SSC and SMC 
devices or to explicitly state that the statements only apply to SBC 
devices or to have a list of behaviors depending on device type.
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 us.ibm.com

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