Re: LUN field in R2T

Your interpretation is more liberal than the text says. The reason for 
requiring a LUN field in the first place was to remove the requirement for 
a  target-wide unique TTT and enable distributed targets that do not 
require coordination.  The reason LUN was chosen to tag the R2T is that it 
may simplify routing of the data to the appropriate destination.
But since it is called LUN some zealous initiator may check (although it 
is not mandated) the LUN validity versus a list obtained otherwise - so I 
would not go for a very liberal interpretation.

Julo



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01/02/08 11:57 PM

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[Ips] LUN field in R2T






Just a quick clarification:
 
10.8.5.  Target Transfer Tag
[...]The Target Transfer Tag and LUN are copied in the outgoing data PDUs 
and are only used by the target.
 
Does this mean that the LUN field in the R2T does not need to contain the 
actual LUN number specified by the SCSI write?   Since the field is ?only 
used by the target? I assume this text means that the target may place 
anything it wants in the LUN field of the R2T and have it echoed back by 
the initiator.
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