question about reservation and persistent reservation

Ming Zhang blackmagic02881 at
Thu Dec 28 08:21:46 PST 2006

* From the T10 Reflector (t10 at, posted by:
* Ming Zhang <blackmagic02881 at>
Hi All
We try to add reservation support to an iSCSI target and have some
questions about reservation.
Reservation is per nexus or per initiator? persistent reservation is per
nexus or per initiator?
Our dilemma is like this. between an iSCSI initiator and target,
multipath IO can (1) has multiple sessions over to same target via
different physical NICs and paths. or (2) has one session with multiple
connections, with each connection over different paths. Base on iSCSI
RFC, (1) will have multiple I_L nexus while (2) only have 1 nexus.
Then for reservation support via RESERVE_6/10, if one initiator reserve
one LU via one session, can this initiator send WRITE or other commands
via another session?
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