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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iSCSI version 0.6 - Query?This is a very good question. If "silently ignore" means that at the time of receipt the target should not attempt to qualify the receipt of the command at the time it received it, but instead attempt to resolve this after the MaxCmdSN has been sent, then I would say it makes sense, but your question interests me with regards to recovery. Since section 6.1 requires Targets to reject PDUs in a session with format errors (assuming a misaligned CmdSN constitutes a format error) then it would seem that this section on page 12 is not in agreement with recovery. But, the recovery section also leaves the door open for Target mode implementation on recovery, so if the paragraph on page 12 over-rides the recovery section, it must be up to the implementer of the Target to attempt to recover such a misaligned command? Bob Robert Griswold Technologist Crossroads Systems, Inc. 512-928-7272 -----Original Message----- From: Tanjore K. Suresh [mailto:Tanjore.Suresh@Sun.COM] Sent: Sunday, June 10, 2001 12:26 AM To: ips@ece.cmu.edu Subject: iSCSI version 0.6 - Query? Hi, Page 12, Last paragraph. Regarding the command sequence number. " The target MUST silently *ignore* any command outside this range or duplicates with in the range that have not been flagged with the retry bit (the X bit in the opcode)" Why ignore commands which are not in the expected range or duplicates with in the range? This type of ignoring could cause initator to cause some unnecessary recovery activity which could/may end up to be not good for the target which is hale and healthy. Such a command could have been errorneously numbered or errorneously checked for this condition or errnoneously delivered with sequence number change because of problems transporting it over the internet fabric. Hence, my opinion is appropriate error need to be returned for such command instead of ignoring. Comments? Thanks sureshtk I
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