Re: Testing for the execution state (represented by identifying the Initiator Task Tag) MUST precede any other action at the target.

Hi Barry,

        So, I could send a Task Management command using the proper ITT 
(without the immediate bit set) using an out of order CmdSN
        and the device server would process the command, resulting in a 
response w/ a status?

I'm not sure what the 'proper ITT' means.   In my understanding, each Task 
Mangement command has a unique ITT.  The ITT of the currently active 
command (to be aborted or reassigned) is in the Referenced Task Tag field. 
 The unique ITT in the task management command will not have any execution 
state, and thus will be subject to ordering. 

regards,

david


Java: The elegant simplicity of C++ 
and the blazing speed of smalltalk.

David J Cuddihy
Principal Engineer
ATTO Technology, Inc.
 

www.attotech.com
Power Behind the Storage



William Studenmund <[email protected]> 
11/02/2007 02:40 PM

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Re: [Ips] Testing for the execution state (represented by identifying the 
Initiator Task Tag) MUST precede any other      action at the target.






On Nov 2, 2007, at 10:54 AM, Barry Reinhold wrote:

Question relative to the proper understanding of the following conformance 
statement from 3.2.2.1
 
A numbered iSCSI request will not change its allocated CmdSN,
regardless of the number of times and circumstances in which it is
reissued (see Section 6.2.1 Usage of Retry). At the target, CmdSN is
only relevant when the command has not created any state related to
its execution (execution state); afterwards, CmdSN becomes
irrelevant. Testing for the execution state (represented by
identifying the Initiator Task Tag) MUST precede any other action at
the target. If no execution state is found, it is followed by
ordering and delivery. If an execution state is found, it is
followed by delivery.
 
Is the proper understanding of this requirement imply that if a task w/ 
ITT=100, sent in an iSCSI PDU w/ CmdSN = 10, has been submitted to the 
device server and is ?executing?, that if another command with the same 
ITT and a CmdSN = 12 (no CmdSN 11 has been xmitted) is received by the 
target, it should ignore the CmdSN = 12 and submit the command to the 
device server?

What kind of second packet are you talking about? Your question above is 
very vague.

So, I could send a Task Management command using the proper ITT (without 
the immediate bit set) using an out of order CmdSN and the device server 
would process the command, resulting in a response w/ a status?

I believe you are correct.

Take care,

Bill_______________________________________________
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