09-085r1 Power Condition Transition modifications

[Kevin D Butt]

Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r0904300_f.htm">HTML-formatted message</a>

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/