RE: iSCSI: multiple sessions b/n a pair of WWUIs.

["KRUEGER,MARJORIE (HP-Roseville,ex1)" <marjorie_krueger@hp.com>]

> One clarification: these are unique between any I-T *pair*.
> (you make it sound like an initiator must have a unique ISID 
> for all sessions
> with all targets)
> 
> -Matt

The ISID must be unique within the iSCSI layer on an iSCSI device - that
amounts to "initiator must have unique ISID for all sessions with all
targets".  

To quote Jim "The requirement in name+disc that a given initiator name
cannot reuse an ISID for two different sessions comes as a consequence a
number of things (which are described in the draft).  The gist is that this
is needed to provide the correct context for restoration of reservations
state (and other nexus state) to a particular nexus after logout/login. In
other words, if the session goes down for some reason, the target needs
clear context to restore nexus state to a rebuilt session. The only tool it
has is uniqueness of Name+ISID combination within its name space."

-Marj