RE: StatSN question

Definitely yes (acknowledging the status is equivalent to acking all the 
data). In addition resources are help to enable status retransmission even 
in commands that do not have data transfers. Julo



"Ken Craig" <[email protected]> 
18/05/07 23:05

To
Julian Satran/Haifa/IBM@IBMIL
cc
<[email protected]>
Subject
RE: [Ips] 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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