RE: Using SNACK to request retransmission of R2T

[David Lee <David.Lee@vicom.com>]

I'm sorry, but I did not understand this response.  The case I am inquiring
about involves a missing R2T PDU (detected as a result of receiving another
R2T with a higher DataSn).  The following excerp is from section 6.7.1:

      (1)Lost data PDU or lost R2T - a data PDU or R2T may be lost 
      due to a header digest error or a data digest error.  In case 
      of a data digest error, the error is recognized immediately and 
      the initiator MAY request the missing data through SNACK. In 
      case of a header digest error, the initiator recognizes the 
      missing data or R2T either when receiving a subsequent piece 
      out of sequence or by a timeout in completing a sequence (no 
      status).  In this case, the initiator MAY request the missing 
      data or R2T through a SNACK. 

The description of the SNACK PDU does not appear to include a form for
requesting retransmission of R2T.


David Lee


-----Original Message-----
From: julian_satran@il.ibm.com
To: ips@ece.cmu.edu
Sent: 5/29/01 8:07 PM
Subject: Re: Using SNACK to request retransmission of R2T



The SNACK is just a data SNACK (R2T are treated as input data for the
command).

Julo

David Lee <David.Lee@vicom.com> on 30-05-2001 04:24:01

Please respond to David Lee <David.Lee@vicom.com>

To:   "'ips@ece.cmu.edu'" <ips@ece.cmu.edu>
cc:
Subject:  Using SNACK to request retransmission of R2T




Hi all,

Please forgive me if this has already been addressed.  In at least one
place
in the Rev. 6 draft it states that SNACK may be used by an initiator to
request a resend by a target of a missing R2T PDU.  However, the format
of
the SNACK PDU does not seem to cover this case.


David Lee
Vicom Systems, Inc.