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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iSCSI: Question: ISID Rule?> > It's the SCSI device that is the comparison point, so you > > are comparing the iSCSI node name of the two entities to > > determine if they are "the same". > > Then this implies that a session is uniquely identified by > (InitiatorName, TargetName). No, a session is uniquely identified by the combination of initiator name, target name, and SSID. It is also uniquely identified by the combination of initiator port name (initiator node name+ISID) and target port name (target node name+PGT), since there can be only one session between a given pair of ports. There can be multiple sessions between an initiator and a target node, but only via different port combinations. > > Then for a new connection at the target: I think you mean "when a login request is received at the target", since a login request can be either a "new connection", or an attempt to recover an existing connection? > > i) TSID!=0 provides implicit uniqueness, > since a new connection will be added, > if the session already exists. I don't know what you're driving at? I can't see where TSID!=0 provides uniqueness, implicit or otherwise. If an initiator sends a login request w/TSID!=0 on a new connection pair, it must be trying to add a connection to a session, assuming all other points of comparison are equal (initiator name, target name, ISID, TSID, target portal group). > > ii) TSID=0, implies that there does NOT exist > a session with the given TargetName, InitatorName > and ISID given in the Login Request PDU, else close the > connection. It implies that the initiator does not think a session currently exists between the initiator and target ports identified by the login request. If a session does exist (from the targets viewpoint), the target should terminate that session as the initiator has lost all state information for that "old" session, and create a new session. See section 4.3.5 Session Reinstatement in draft 11 for further explanation.
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