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    RE: iSCSI Reqts: In-Order Delivery



    Doug,
    
    At the moment, I'm trying to resolve the last call
    issue around the requirements draft.  In what you've
    written, I see an issue with the iSCSI specification
    draft, but not a need for any change to the
    requirements draft.
    
    Thanks,
    --David
    
    > -----Original Message-----
    > From:	Douglas Otis [SMTP:dotis@sanlight.net]
    > Sent:	Friday, April 20, 2001 9:37 PM
    > To:	Black_David@emc.com; ips@ece.cmu.edu
    > Subject:	RE: iSCSI Reqts: In-Order Delivery
    > 
    > David,
    > 
    > iSCSI has presently made providing this impossible.  You can not make
    > assumptions about relative delivery rates between connections.  This can
    > and
    > should be fixed.  As you know, I like my solution but there are many
    > others.
    > 
    > Doug
    > 
    > 
    > > Doug,
    > >
    > > Attempting a fast exit ... I agree with the interpretation
    > > of SAM insofar as SCSI responses are concerned - the
    > > description of ABORT TASK in SAM (6.1) is clear that a
    > > SCSI response to an aborted task must not be delivered to
    > > an initiator after the FUNCTION COMPLETE from the ABORT
    > > TASK that aborted it is, and similarly for both ABORT
    > > TASK SET and CLEAR TASK SET.
    > >
    > > Since this requirement is contained in the
    > > existing requirement to adhere to SAM, we don't need
    > > any additional text in the iSCSI requirements draft,
    > > right ;-) ?
    > >
    > > ???,
    > > --David
    > >
    > > > -----Original Message-----
    > > > From:	Douglas Otis [SMTP:dotis@sanlight.net]
    > > > Sent:	Friday, April 20, 2001 7:50 PM
    > > > To:	Black_David@emc.com; ips@ece.cmu.edu
    > > > Subject:	RE: iSCSI Reqts: In-Order Delivery
    > > >
    > > > David,
    > > >
    > > > I suggested one solution that has several benefits.  This one
    > suggestion
    > > > is
    > > > not the only option to resolve this issue.  Connection
    > > Allegiance does not
    > > > resolve state with respect to Management requests.  Off hand I can
    > think
    > > > of
    > > > several other options as these requests are clearly indicated.  How
    > this
    > > > problem is resolved should be considered a separate issue, but there
    > is
    > > > this
    > > > requirement that should not be overlook.  My interpretation of
    > > SAM places
    > > > this obligation on the transport.
    > > >
    > > > Doug
    > > >
    > > >
    > > > > Focusing solely on the discussion needed to resolve the
    > > > > (last call) issue in the requirements draft:
    > > > >
    > > > > (A) Charles suggests that "ordered delivery of SCSI commands"
    > > > > 	should include task management commands.  That
    > > > > 	was the intent of the proposal and words should be
    > > > > 	added to make this clear.  Section 7.3 of the -06
    > > > > 	version of the main iSCSI document contains an
    > > > > 	initial version of a description of how task management
    > > > > 	commands can be executed immediately but have the
    > > > > 	effects they would have had if delivered in order.
    > > > >
    > > > > (B) Doug is concerned that the task management response
    > > > > 	may arrive before the responses to one or more
    > > > > 	commands that were affected by the task management
    > > > > 	command.  While his technical concern is valid,
    > > > > 	and has/is being discussed, I don't think foreclosing
    > > > > 	that discussion by requiring session-wide
    > > > > 	synchronization of responses in the requirements
    > > > > 	document is the right thing to do.  Hence I would
    > > > > 	not change the proposal to require such synchronization.
    > > > >
    > > > > Thanks,
    > > > > --David
    > > > >
    > >
    


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Last updated: Tue Sep 04 01:04:57 2001
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