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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iscsi: Text keyscomments/answers in text. Thanks, Julo sandeepj@research.bell-labs.com (Sandeep Joshi) on 02-05-2001 06:49:53 Please respond to sandeepj@research.bell-labs.com (Sandeep Joshi) To: ips@ece.cmu.edu cc: Subject: iscsi: Text keys Julian, Some comments on the text keys defined in Appendix E. thanks, -Sandeep 1) There are several text keys which have been specified with Use=ALL. Such keys can be negotiated during full-feature phase, which raises interesting questions about their effect on currently outstanding tasks. For example, a) maxOutstandingR2T : what is the effect on currently outstanding R2Ts ? b) LoginLogoutMaxTime : how does it affect connections which just got dropped and need to be recovered ? c) DataPDULength : effect on data PDUs in flight. Similar questions need to be answered for practically all the keys which have this behaviour. For the sake of simplicity, it may be better to forbid such usage and allow these keys to be only negotiated in the connection or session login phase. +++ some of the parameters you mentioned are SCSI mode-page parameters. Even if we restricted them to login they can be changed by a SCSI mode-set. I agree that keeping them all restricted to login would simplify implementations but I am not convince it would make them better. Evidently a negotiated change will apply to all packets that are sent after the negotiation ended (and a negotiation end is known to both parties) and an initiator will avoid sending things in violation of its last offering. Except that we will have to find a way to reject mode set I am open to restrict those parameters to login if that is what the majority of implementors tells me. +++ 2) The paragraph on TargetAddress seems to indicate that one or more text responses could be sent to satisfy a SendTargets command. "If the list cant be delivered as a single text response PDU, ..several text response PDUs can be sent..logical merge of the individual lists". How does the initiator know more than one TextResponse PDUs are expected for that TextCommand PDU ? If the final bit is to be used, does it imply that the initiator should keep sending the sendTargets TextCommand with f=1 until it receives the last TextResponse PDU ? Could you please clarify... +++ the value 0 in the F bit of a text commands tells you that there is more to come. I addition I think that the naming and discovery folks are looking at a "list syntax" ++++ 3) SendTargets again. The ordering within the text response currently is implied and needs to be specified so that the initiator can correlate the target alias with the target addresses. Something along these lines may help "The order within a text response should be (targetName, targetAlias(if any), list of addresses)" +++ I have to coordinate this with the Naming and discovery team. +++ 4) The section on InitiatorName seems to imply that the target can also propose the value for this key ?? I presume this is a typo. See "Who: Initiator and Target" +++ it is a typo thanks +++
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