using Request Sense

Knight, Frederick Frederick.Knight at
Tue Jul 1 13:09:29 PDT 2008

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REQUEST SENSE is also used as an independent command to determine the
power state of the device.
See the description of the REQUEST SENSE command in SPC.
    Fred Knight
From: Mark Overby [mailto:moverby at] 
Sent: Wednesday, June 25, 2008 10:06 PM
To: Eddy Quicksall; t10 at
Subject: 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>
	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?
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