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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iSCSI Reqts: In-Order DeliveryDoug, 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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