iSCSI : target session login behaviour

[Santosh Rao <santoshr@cup.hp.com>]

All,

How should a target respond when it receives a session login  [on a new
TCP connection] with the same (ISID, Initiator Name) as a session
already active at the target.

Does such a login request imply :

1) the target should perform implicit logout and re-login of the session
identified by (ISID, initiator name) ? 

2) Or does this result in the target responding to the session login
with :
a login response with status class of non-zero indicating target is
rejecting the login ?

[The draft does not describe target behaviour for this scenario.]

iSCSI session login semantics should explicitly state that the above
scenario will result in case (1) above. i.e. when a target sees a
session login for a given (ISID, initiator name), it MUST treat this as
an implicit logout of any previous session active at the target for that
(ISID, initiator name) and then, establish a new session.

This is required because the above scenario can typically occur when an
initiator reboots without having performed a session logout on all
active sessions.(system did not perform an orderly shutdown).
 
As a side note, the iSCSI draft Status Class/Codes could do with a misc
error category along the lines of the FC "No additional Explantion"
reason explantion. This would help deal with error conditions that don't
come under the listed category.

- Santosh
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