RE: StatSN question

Julian,
 
When you say "target may discard whatever it may have
hold for the task" aren't you saying the same thing as
Eddy.  That the ExpStatSN is an indication that the
Initiator has also received the data since resources would
have been used for the data.
 
Thanks,
Ken Craig
 
 
 -----Original Message-----
From: Julian Satran [mailto:[email protected]] 
Sent: Friday, May 18, 2007 12:47 PM
To: Eddy Quicksall
Cc: [email protected]; Ken Craig
Subject: Re: [Ips] StatSN question




	ExpStatSN indicates to the target that the initiator has
received the status for the task and the target may discard whatever it
may have hold for the task. 
	It also indicates to to the target when it is safe to send the
response to a task abort or a "group" abort task management function. 
	Whether you can you use TCP ack for the same pupose dependes on
how you stack is layered and/or how your recovery from end-to-end errors
is done. 
	
	Julo 
	
	
	
"Eddy Quicksall" <[email protected]> 

18/05/07 08:03 

To
"Ken Craig" <[email protected]>, <[email protected]> 
cc
Subject
Re: [Ips] StatSN question

	




	It would mean the header and data has been received. The reason
is because 
	the target can use ExpStatSN to free the resources used to send
the Data-in. 
	At ERL 0 it is faster to just use the TCP ACK; for ERL > 0 I
think there was 
	argument given once that the TCP ACK may not really indicate
that the data 
	was received and hence the ExpStatSN would be used for that
purpose (I don't 
	really remember that well though).
	
	Eddy
	
	----- Original Message ----- 
	From: "Ken Craig" <[email protected]>
	To: <[email protected]>
	Sent: Friday, April 27, 2007 5:23 PM
	Subject: [Ips] StatSN question
	
	
	I have a question about what ExpStatSN means that
	I can't find an answer for in the reflector archives
	or in any of the RFCs.
	
	I, as an iSCSI Target running at ERL=0, send a
	DATA IN PDU with FINAL=1 and a StatSN of 0.  I
	receive a SCSI CMD PDU with an ExpStatSN of 1.
	Does this mean that the Initiator has received
	the PDU BHS and all of the data or is it simply
	an acknowledgement that it has received the PDU
	BHS?
	
	Thanks,
	Ken Craig
	
	
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