using Request Sense

[Elliott, Robert (Server Storage)]

* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
It's also used for unit attention interlock (a feature requested by the iSCSI
community).
When enabled, after the device server returns BUSY, TASK SET FULL, or
RESERVATION CONFLICT, it starts returning
CHECK CONDITION/UNIT ATTENTION/PREVIOUS BUSY STATUS
for every command from that I_T nexus until it processes a REQUEST SENSE
command from that I_T nexus.  The REQUEST SENSE command clears a unit
attention interlock the same way a CLEAR ACA task management function
clears an ACA condition.
---
Rob Elliott, HP Industry Standard Server Storage
________________________________
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Ralph Weber
Sent: Wednesday, June 25, 2008 10:10 PM
To: t10 at t10.org
Subject: Re: using Request Sense
I support Katata-san.
The REQUEST SENSE command is very useful in monitoring the progress
of long-running operations, some of which have been pushed into the
background by setting the IMMED bit to one.
In fact, I have just posted a proposal to enhance this capability.
http://www.t10.org/ftp/t10/document.08/08-263r0.pdf
All the best,
.Ralph
keiji_katata at post.pioneer.co.jp wrote:
	* From the T10 Reflector (t10 at t10.org), posted by:
	* keiji_katata at post.pioneer.co.jp
	*
	In the case of autosense environment, to see the progress indication
in the
	sense data, you may use the request sense command alone.
	Best regards,
	Keiji Katata
	PIONEER CORP.
	Mark Overby <moverby at nvidia.com>  @t10.org
on 2008/06/26 11:06:24
	$BAw?.<T(B:	  owner-t10 at t10.org
	$B08 at h(B:  Eddy Quicksall <Quicksall_SCSI at Bellsouth.net>
<mailto:Quicksall_SCSI at Bellsouth.net> , <t10 at t10.org> <mailto:t10 at t10.org>
	cc:
	$B7oL>(B:  Re: using Request Sense
	For protocols that use autosense, probably not.
	For protocols that do not have autosense, you bet. (There are quite a
few wide
	spread protocols that do not have autosense capability).
	On 6/25/08 6:51 PM, "Eddy Quicksall" <Quicksall_SCSI at bellsouth.net>
<mailto:Quicksall_SCSI at bellsouth.net>  wrote:
	      Since some protocols use autosense then the sense data will be
cleared
	      when a command creates the condition and request sense will
just get back
	      "no sense".
	      Is there a case where request sense is still useful?
	      Eddy
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