Subject: Re: Fwd: questions on iSCSI draft

From: "Julian Satran" <[email-masked]>
Date: Sat, 1 Dec 2001 09:39:33 +0200

some comments in text - Julo

                    Subbu                                                                                                           
                    Subramaniam          To:     "Julian Satran" <[email-masked]>                                         
                    <subbu_ario@ya       cc:                                                                                        
                    hoo.com>             Subject:     Fwd: questions on iSCSI draft                                                 
                                                                                                                                    
                    11/29/2001                                                                                                      
                    08:09 PM                                                                                                        

Hi Julian,

I had sent the questions in the attached mail to the
mailing list, but nobody has clarified.

I thought I would check with the author of the draft.
I would appreciate if you can answer them.

thanks,

-Subbu

Note: forwarded message attached.

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----- Message from Subbu Subramaniam <[email-masked]> on Fri, 16 Nov
2001 15:44:13 -0800 (PST) -----
                                 
      To: [email-masked]        
                                 
      cc: [email-masked]   
                                 
 Subject: questions on iSCSI     
          draft                  

Hi,

I am reading through the iSCSI draft, and a I have a
few questions. I would appreciate if someone
clarifies:

1. The default value of FirstBurstSize (amount of data
that can be included immediate with a commdn) is 128
units, and that of DataPDULength (amount of data in a
DATA-only PDU) is 16 units. If a target can accept 128
bytes of data immediately with a command, do we expect
 that the same target will only accept less number of
units in a later PDU? Why? Should the FirstBurstSize
not be less than DataPDULength and not vice versa?
(asme argument holds for initiator, since both can
specify this option).

+++ You must be reading an old version of the spec. But even there the
units where not bytes by 512 byte block. First burst includes immediate and
unsolicited data PDUs that follow.
+++

2. If a target has sent more than one R2T PDUs, and
DataSequenceInOrder is "no", then can the initiator
interleave data between the two sequences? It seems
that the target should be able to distinguish between
the PDUs belonging to the two sequences using the
"Buffer Offset" field, and the spec does not prohibit
the initiator from sending two sequences
simultaneously.

+++ The spec requires R2Ts to be fulfilled in order as the target may need
the data in that order (and to minimize bookkeeping at the target).
 +++

Thanks,

-Subbu

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