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Subject: [Ips] iSCSI RW Command
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Dear all , as mentioned above , what kind of SCSI command can be classfied
as RW command in iSCSI sense ? For an example ? Thanks in advance

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Dear all , as mentioned above , what kind of SCSI command can be classfied as RW command in iSCSI sense ? For an example ? Thanks in advance<br>

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Bidirectional SCSI commands (that transfer data in both directions
in executing a single SCSI command) are not used much, but they do
exist.
=20
An example is the XDWRITEREAD (10) command in SBC (see latest draft
of SBC-3).
=20
Thanks,
--David

=20


________________________________

	From: ips-bounces@ietf.org [mailto:ips-bounces@ietf.org] On
Behalf Of yushang
	Sent: Tuesday, September 22, 2009 12:35 AM
	To: ips@ietf.org
	Subject: [Ips] iSCSI RW Command
=09
=09
	Dear all , as mentioned above , what kind of SCSI command can be
classfied as RW command in iSCSI sense ? For an example ? Thanks in
advance
=09


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<BODY>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New"=20
size=3D2>Bidirectional SCSI commands (that transfer data in both=20
directions</FONT></SPAN></DIV>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New" =
size=3D2>in executing=20
a single&nbsp;SCSI command) are not used much, but they =
do</FONT></SPAN></DIV>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New"=20
size=3D2>exist.</FONT></SPAN></DIV>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New"=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New" =
size=3D2>An example=20
is the XDWRITEREAD (10) command in SBC (see latest =
draft</FONT></SPAN></DIV>
<DIV><SPAN class=3D671170011-22092009><FONT face=3D"Courier New" =
size=3D2>of=20
SBC-3).</FONT></SPAN></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Thanks,<BR>--David<BR></DIV></FONT>
<DIV>&nbsp;</DIV><BR>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> ips-bounces@ietf.org=20
  [mailto:ips-bounces@ietf.org] <B>On Behalf Of =
</B>yushang<BR><B>Sent:</B>=20
  Tuesday, September 22, 2009 12:35 AM<BR><B>To:</B>=20
  ips@ietf.org<BR><B>Subject:</B> [Ips] iSCSI RW =
Command<BR></FONT><BR></DIV>
  <DIV></DIV>Dear all , as mentioned above , what kind of SCSI command =
can be=20
  classfied as RW command in iSCSI sense ? For an example ? Thanks in=20
advance<BR></BLOCKQUOTE></BODY></HTML>

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Subject: [Ips] Data-In ExpDataSN
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Dear all , RFC 3720 says that Data-In/R2T PDU number is acknowledged by
ExpDataSN filed of SCSI Response . But if a target choose to send a Data-In
PDU with S bit set instead of a SCSI Response . Where to get the ExpDataSN ?
There is no such a field in Data-In PDU. Many thanks.

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Dear all , RFC 3720 says that Data-In/R2T PDU number is acknowledged by Exp=
DataSN filed of SCSI Response . But if a target choose to send a Data-In PD=
U with S bit set instead of a SCSI Response . Where to get the ExpDataSN ? =
There is no such a field in Data-In PDU. Many thanks.<br>

--001636e0ba2a941d2b0474611619--

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> RFC 3720 says that Data-In/R2T PDU number is acknowledged by ExpDataSN
filed of SCSI Response=20
=20
Where?  Section 3.2.2.3 says:
    Data and R2T PDUs are implicitly acknowledged by status for the
command.

> But if a target choose to send a Data-In PDU with S bit set instead of
a SCSI Response .
> Where to get the ExpDataSN ? There is no such a field in Data-In PDU.

Not by that name, but the information is present.  The ExpDataSN
field in the SCSI Response PDU is "The number of R2T and Data-In
(read) PDUs the target has sent for the command."  That number can
be obtained from a Data-In PDU whose S bit is set to 1 by adding 1
to the value of that PDU's DataSN field.

Thanks,
--David


=20



________________________________

	From: ips-bounces@ietf.org [mailto:ips-bounces@ietf.org] On
Behalf Of yushang
	Sent: Friday, September 25, 2009 2:31 AM
	To: ips@ietf.org
	Subject: [Ips] Data-In ExpDataSN
=09
=09
	Dear all , RFC 3720 says that Data-In/R2T PDU number is
acknowledged by ExpDataSN filed of SCSI Response . But if a target
choose to send a Data-In PDU with S bit set instead of a SCSI Response .
Where to get the ExpDataSN ? There is no such a field in Data-In PDU.
Many thanks.
=09


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<DIV><SPAN class=3D413092214-25092009>&gt; RFC 3720 says that =
Data-In/R2T PDU=20
number is acknowledged by ExpDataSN filed of SCSI Response </SPAN></DIV>
<DIV><SPAN class=3D413092214-25092009><FONT face=3D"Courier New"=20
size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D413092214-25092009><FONT face=3D"Courier New" =
size=3D2>Where?&nbsp;=20
Section 3.2.2.3 says:</FONT></SPAN></DIV>
<DIV><SPAN class=3D413092214-25092009><SPAN lang=3DEN>
<P><SPAN class=3D413092214-25092009>&nbsp;&nbsp;&nbsp; </SPAN>Data and =
R2T PDUs=20
are<SPAN class=3D413092214-25092009> </SPAN>implicitly acknowledged by =
status for=20
the command.</P>
<P><SPAN class=3D413092214-25092009>&gt; But if a target choose to send =
a Data-In=20
PDU with S bit set instead of a SCSI Response .<BR>&gt; </SPAN><SPAN=20
class=3D413092214-25092009>Where to get the ExpDataSN ? There is no such =
a field=20
in Data-In PDU.</SPAN></P>
<P><SPAN class=3D413092214-25092009><FONT face=3D"Courier New" =
size=3D2>Not by that=20
name, but the information is present.&nbsp; The ExpDataSN<BR>field in =
the SCSI=20
Response PDU is "<SPAN lang=3DEN>The number of R2T and Data-In<BR>(read) =

</SPAN></FONT></SPAN><SPAN class=3D413092214-25092009><FONT =
face=3D"Courier New"=20
size=3D2><SPAN lang=3DEN>PDUs the target has sent for the =
command."&nbsp; That=20
number can<BR>be </SPAN></FONT></SPAN><SPAN =
class=3D413092214-25092009><FONT=20
face=3D"Courier New" size=3D2><SPAN lang=3DEN>obtained from a Data-In =
PDU whose S bit=20
is set to 1 by adding 1<BR>to the value of that PDU's DataSN=20
field.</SPAN></FONT></SPAN><SPAN class=3D413092214-25092009><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
lang=3DEN></P></SPAN></FONT></SPAN></SPAN></SPAN></DIV><!-- Converted =
from text/plain format -->
<P><FONT size=3D2>Thanks,<BR>--David<BR></FONT></P>
<DIV>&nbsp;</DIV><FONT face=3D"Courier New" size=3D2></FONT><BR>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px =
solid; MARGIN-RIGHT: 0px">
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> ips-bounces@ietf.org=20
  [mailto:ips-bounces@ietf.org] <B>On Behalf Of =
</B>yushang<BR><B>Sent:</B>=20
  Friday, September 25, 2009 2:31 AM<BR><B>To:</B>=20
  ips@ietf.org<BR><B>Subject:</B> [Ips] Data-In =
ExpDataSN<BR></FONT><BR></DIV>
  <DIV></DIV>Dear all , RFC 3720 says that Data-In/R2T PDU number is=20
  acknowledged by ExpDataSN filed of SCSI Response . But if a target =
choose to=20
  send a Data-In PDU with S bit set instead of a SCSI Response . Where =
to get=20
  the ExpDataSN ? There is no such a field in Data-In PDU. Many=20
thanks.<BR></BLOCKQUOTE></BODY></HTML>

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