Mode Sense

Kevin_Marks at Kevin_Marks at
Wed Jul 9 18:56:16 PDT 2008

Formatted message: <A HREF="r0807091_f.htm">HTML-formatted message</A>

I would say, it means that current and saved are the same. You cannot
change the saved page without changing the current operating mode,
therefore you must always set the SP bit to 1, changing the current and
saved page. A bit of zero would mean changing the saved page but not the
current and this would not make sense if they were the same, hence the
From: owner-t10 at [mailto:owner-t10 at] On Behalf Of Eddy
Sent: Wednesday, July 09, 2008 3:08 PM
To: t10 at
Subject: Mode Sense
6.9 MODE SELECT(6) command
. . .
A save pages (SP) bit set to zero specifies that the device server shall
perform the specified MODE SELECT
operation, and shall not save any mode pages. If the logical unit
implements no distinction between current and
saved mode pages and the SP bit is set to zero, the command shall be
terminated with CHECK CONDITION status,
. . .
If my target is not saving mode pages then I am assuming the "logical
unit implements no distinction between current and saved mode pages". If
that is the case then I don't understand the sentence because it would
seem the initiator would have to set SP to 0; but 0 would cause a CHECK
CONDITION. So I think I don't understand the meaning.
Can someone explain what this means? 

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