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    RE: iSCSI: Data In PDU with S bit set



    Title: RE: iSCSI: Data In PDU with S bit set

    In section 10.7 (draft 20):

       Status can accompany the last Data-in PDU if the command did not end
       with an exception (i.e., the status is "good status" - GOOD,
       CONDITION MET or INTERMEDIATE CONDITION MET).  The presence of
       status (and of a residual count) is signaled though the S flag bit.
       Although targets MAY choose to send even non-exception status in
       separate responses, initiators MUST support non-exception status in
       Data-In PDUs.

    Based on the last sentence of the above paragraph, the initiator has
    to be able to handle both cases, while the target has the option to
    not send a separate response if there is no exception.

    -Dennis

    >-----Original Message-----
    >From: Buck Landry [mailto:blandry@crossroads.com]
    >Sent: Wednesday, February 19, 2003 5:18 PM
    >To: Lakshmi Ramasubramanian
    >Cc: ips@ece.cmu.edu; Julian_Satran@il.ibm.com
    >Subject: RE: iSCSI: Data In PDU with S bit set
    >
    >
    >Well, I don't see any explicit text (too bad), but..
    >
    >3.5.1.5 "the last SCSI Data-in PDU passed for a command may
    >also contain the status if the status indicates termination
    >with no exceptions (no sense or response involved)"
    >
    >.. implies (maybe just to me) that the SCSI task is terminated
    >by a Data-In PDU w/S bit set.  A further response to a
    >terminated task would be inappropriate methinks, unless you
    >want to start talking about error recovery..
    >
    >Hope this helps, --buck
    >
    > -----Original Message-----
    >From: Lakshmi Ramasubramanian [mailto:nramas@windows.microsoft.com]
    >Sent: Wednesday, February 19, 2003 4:55 PM
    >To: ips@ece.cmu.edu
    >Subject: iSCSI: Data In PDU with S bit set
    >
    >
    >If the target sends a Data In PDU with S bit set,
    >can it also send a SCSI Response PDU for the same command?
    >
    >If the answer is no, there is no text in the spec that
    >says a target should not send scsi response PDU.
    >
    >thanks!
    > -lakshmi
    >
    >
    >
    >
    >



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Last updated: Fri Feb 21 02:19:12 2003
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