ADC-2 Question regarding.

Kevin D Butt kdbutt at us.ibm.com
Wed Jan 25 16:49:17 PST 2006


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* Kevin D Butt <kdbutt at us.ibm.com>
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Halvard,

If I remember correctly, that restriction should be on the ADC LUN page,=20
not the SMC LUN page.  We didn't want a host on the primary interface to=20
be able to disable itself and get in an unrecoverable scenario.

Does anybody remember differently?

Thanks,

Kevin D. Butt
Fibre Channel & SCSI Architect, IBM Tape Firmware,=20
6TYA, 9000 S. Rita Rd., Tucson, AZ  85744
Tie-line 321; Office: 520-799-5280, Lab: 799-5751, Fax: 799-4138, Email:=20
kdbutt at us.ibm.com



"Halvard Eriksen" <halvard.eriksen at tandberg.com>=20
Sent by: owner-t10 at t10.org
01/25/2006 11:18 AM

To
<t10 at t10.org>
cc

Subject
ADC-2 Question regarding.






To:        ADI-2 working group members.
From;    Halvard Eriksen, Tandberg Data ASA.
.
We have encountered a small problem in ADC-2 in chapter 6.2.2.4.3 SMC=20
logical unit descriptor format.
=20
In the paragraph next in front of the last, it is stated that:
 ?If the ADC device server receives a MODE SELECT command via a DT device=20
primary port, and the parameter
data would change the ENABLE bit, the ADC device server shall return Check =

Condition ??..?
=20
I assume the ENABLE bit in question is the one in the SMC logical unit=20
descriptor.=20
=20
Why is it not the same for the ENABLE bits in the RMC and the ADC logical=20
unit descriptor.
Why is the SMC ENABLE bit special.
Can someone that took part in the discussion resulting in this text kindly =

help me with an explanation?
=20
If required, I would like to have a short discussion on this subject=20
during the March ADI meeting.
Should it be required to make a formal proposal for a change in the=20
standard, I am willing to
do that based on next meeting discussion.
=20
Regards
Halvard Eriksen
Tandberg Data ASA.
=20

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<br><font size=3D2 face=3D"sans-serif">Halvard,</font>
<br>
<br><font size=3D2 face=3D"sans-serif">If I remember correctly, that restri=
ction
should be on the ADC LUN page, not the SMC LUN page. &nbsp;We didn't want
a host on the primary interface to be able to disable itself and get in
an unrecoverable scenario.</font>
<br>
<br><font size=3D2 face=3D"sans-serif">Does anybody remember differently?</=
font>
<br>
<br><font size=3D2 face=3D"sans-serif">Thanks,</font>
<br><font size=3D2 face=3D"sans-serif"><br>
Kevin D. Butt<br>
Fibre Channel &amp; SCSI Architect, IBM Tape Firmware, <br>
6TYA, 9000 S. Rita Rd., Tucson, AZ &nbsp;85744<br>
Tie-line 321; Office: 520-799-5280, Lab: 799-5751, Fax: 799-4138, Email:
kdbutt at us.ibm.com</font>
<br>
<br>
<br>
<table width=3D100%>
<tr valign=3Dtop>
<td width=3D40%><font size=3D1 face=3D"sans-serif"><b>"Halvard Eriksen=
"
<halvard.eriksen at tandberg.com&gt;</b> </font>
<br><font size=3D1 face=3D"sans-serif">Sent by: owner-t10 at t10.org</font>
<p><font size=3D1 face=3D"sans-serif">01/25/2006 11:18 AM</font>
<td width=3D59%>
<table width=3D100%>
<tr>
<td>
<div align=3Dright><font size=3D1 face=3D"sans-serif">To</font></div>
<td valign=3Dtop><font size=3D1 face=3D"sans-serif"><t10 at t10.org&gt;</fo=
nt>
<tr>
<td>
<div align=3Dright><font size=3D1 face=3D"sans-serif">cc</font></div>
<td valign=3Dtop>
<tr>
<td>
<div align=3Dright><font size=3D1 face=3D"sans-serif">Subject</font></div>
<td valign=3Dtop><font size=3D1 face=3D"sans-serif">ADC-2 Question regardin=
g.</font></table>
<br>
<table>
<tr valign=3Dtop>
<td>
<td></table>
<br></table>
<br>
<br>
<br><font size=3D2 face=3D"Arial">To: &nbsp; &nbsp; &nbsp; &nbsp;ADI-2 work=
ing
group members.</font>
<br><font size=3D2 face=3D"Arial">From; &nbsp; &nbsp;Halvard Eriksen, Tandb=
erg
Data ASA.</font>
<br><font size=3D2 face=3D"Arial">.</font>
<br><font size=3D2 face=3D"Arial">We have encountered a small problem in AD=
C-2
in chapter 6.2.2.4.3 SMC logical unit descriptor format.</font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br><font size=3D2 face=3D"Arial">In the paragraph next in front of the las=
t,
it is stated that:</font>
<br><font size=3D2 face=3D"Arial">&nbsp;&#8220;If the ADC device server rec=
eives
a MODE SELECT command via a DT device primary port, and the parameter</font>
<br><font size=3D2 face=3D"Arial">data would change the ENABLE bit, the ADC
device server shall return Check Condition &#8230;&#8230;..&#8221;</font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br><font size=3D2 face=3D"Arial">I assume the ENABLE bit in question is the
one in the SMC logical unit descriptor. </font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br><font size=3D2 face=3D"Arial">Why is it not the same for the ENABLE bits
in the RMC and the ADC logical unit descriptor.</font>
<br><font size=3D2 face=3D"Arial">Why is the SMC ENABLE bit special.</font>
<br><font size=3D2 face=3D"Arial">Can someone that took part in the discuss=
ion
resulting in this text kindly help me with an explanation?</font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br><font size=3D2 face=3D"Arial">If required, I would like to have a short
discussion on this subject during the March ADI meeting.</font>
<br><font size=3D2 face=3D"Arial">Should it be required to make a formal pr=
oposal
for a change in the standard, I am willing to</font>
<br><font size=3D2 face=3D"Arial">do that based on next meeting discussion.=
</font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br><font size=3D2 face=3D"Arial">Regards</font>
<br><font size=3D2 face=3D"Arial">Halvard Eriksen</font>
<br><font size=3D2 face=3D"Arial">Tandberg Data ASA.</font>
<br><font size=3D2 face=3D"Arial">&nbsp;</font>
<br>
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