09-085r1 Power Condition Transition modifications

[Gerry.Houlder at seagate.com]

* From the T10 Reflector (t10 at t10.org), posted by:
* Gerry.Houlder at seagate.com
*
I believe that the SPC-4 text added by Kevin Marks that mentions START STOP
UNIT is of the form "..all commands, except START STOP UNIT, shall do this
..". If you are a device that doesn't support this command, then excepting
this command from the behavior should not be any consequence to you.
There are plenty of other reasons to disagree with this proposal, this
reason is minor compared to those. See you next week.
	     Kevin D Butt						   
	     <kdbutt at us.ibm.co						   
	     m> 							To 
	     Sent by:		       <Kevin_Marks at Dell.com>		   
	     owner-t10 at t10.org						cc 
	     No Phone Info	       t10 at t10.org			   
	     Available						   Subject 
				       RE: 09-085r1 Power Condition	   
				       Transition modifications 	   
	     04/30/2009 12:48						   
	     PM 							   
Kevin,
In 5.10.5.4.2 there is a new paragraph about ITC.  BTW, there is an
unordered list with only one item - oops.
Also 5.10.5.5.2 and 5.10.5.5.3	BTW, there is an unordered list with only
one item - oops.
You might make the argument that the START STOP UNIT command is not
required and therefore that it is not necessary to spell out the
difference, but it does levy a requirement on all devices and I think it
should be clear.
In 7.4.2 the two new bits are added ITC and STC.  Looking a little closer,
this is the crux of the issue.	It may be a nit, but tape and library
devices (and any other) that do not support the START STOP UNIT command
have a curious choice here.  Either support the bit - and imply the START
STOP UNIT command which cannot be supported - or not allow the bit to be
supported - in which case they can't get the in process of becoming ready
response.  Does there need to be an explicit statement or what?
Thanks,
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
http://www-03.ibm.com/servers/storage/
 From:	    <Kevin_Marks at Dell.com>					   
 To:	    Kevin D Butt/Tucson/IBM at IBMUS, <t10 at t10.org>		   
 Date:	    04/29/2009 07:43 PM 					   
 Subject:   RE: 09-085r1 Power Condition Transition modifications	   
Kevin,
I will take a look at it, and see where in the proposal and SPC4 you think
it assumes a block device and START STOP UNIT. Are you talking about LU
Control? I looked thru rev 2 that I am working on, and did not see the
issue. Almost all the SSU command changes are in SBC3.
Kevin
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Kevin D
Butt
Sent: Wednesday, April 29, 2009 6:23 PM
To: t10 at t10.org
Subject: 09-085r1 Power Condition Transition modifications
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.
Thanks,
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
http://www-03.ibm.com/servers/storage/
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