Re: iSCSI: draft 7: Final bit in Data PDUs

["Julian Satran" <Julian_Satran@il.ibm.com>]

Rishab,

I am not sure what you are asking for.
Both for read and for write the status is the one that dictate when things
end.
For bidirectional this does not change.
It is obvious an error to have a status arrive when a data sequence is not
terminated.

Julo


Rishabh Srivastav <rishabh_srivastav@yahoo.com> on 10-08-2001 19:48:43

Please respond to Rishabh Srivastav <rishabh_srivastav@yahoo.com>

To:   Julian Satran/Haifa/IBM@IBMIL
cc:
Subject:  Re: iSCSI: draft 7: Final bit in Data PDUs



Julian,
Can we retain the previous definition of F bit ? In
the case of write, the term "sequence of PDU's" has a
meaning since a sequence is always demarcated by an
R2T. However, the new concept of "sequence of PDU's"
in the case of read is not analogous to the write
sequence as there is no definite demarcation like R2T
even in the case of bi-di reads.
I would rather ask for another bit in the case of
write that tells that the whole write transaction is
over, synonymous to the old F-bit defintion for read.
regards,
Rishabh

--- Julian Satran <Julian_Satran@il.ibm.com> wrote:
>
> Yes. Julo
>
> Rishabh Srivastav <rishabh_srivastav@yahoo.com> on
> 08-08-2001 20:48:40
>
> Please respond to Rishabh Srivastav
> <rishabh_srivastav@yahoo.com>
>
> To:   Julian Satran/Haifa/IBM@IBMIL
> cc:
> Subject:  Re: iSCSI: draft 7: Final bit in Data PDUs
>
>
>
> which means, there can even be a case of consecutive
> sequences of Data-in PDUs,
> with each sequence consisting of 1 PDU with F bit
> set.
> is it so ?
>
> -rishabh
>
> Julian Satran wrote:
>
>   Elliot,
>
>   Thanks .  Will change 2.7.1 to read:
>
>   1.1.1     F (Final) Bit
>
>      For outgoing data, this bit is 1 for the last
> PDU
> of unsolicited data or
>      the last PDU of a sequence answering a R2T.
>
>      For incoming data, this bit is 1 for the last
> input (read) data PDU of a
>      sequence.  Input can be split in several
> sequences each one having it's
>      own F bit. Splitting in sequences does not
> affect
> DataSN counting on
>      Data-IN PDUs but MAY be used as a "change
> direction" indication for
>      Bidirectional operations that need such a
> change
> and/or end of
>      recoverable sequences by targets with a limited
> replay buffer.
>
>      For Bidirectional operations, the F bit is 1
> both
> for the end of the
>      input sequences as well as the end of the
> output
> sequences.
>
>    Comments?
>
>    Julo
>
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