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Changing the Reserve Conditions (Superseding Reserve)
The INIT which has the reserve right for an IDD (the INIT which has issued this command in
the past and has established the IDD reserve state) can change the IDD's reserve conditions by
issuing a another RESERVE command (Superseding Reserve).
When a superseding reserve is executed, the IDD releases the reserve state it was in up to that
point and establishes a new reserve state in accordance with the specifications in this newly
issued command.
By using this function, the INIT can, for example, change the SCSI device (SCSI ID) for
which the logical unit is reserved while continuing the reserve state of the logical unit with
which the reserve state was established using the previous third party reserve function.
•
Reserve Right and the Third Party Reserve Function
Remark
In order to clarify the jurisdiction related to reserve and release, the term "Reserve Right"
is used in this manual.
INIT
#A
TARG
#0
1. If INIT #A issues a RESERVE command which does not specify the third party reserve
function to TARG #0, TARG #0 enters the reserved state from INIT #A and INIT #A has
the reserve right with respect to TARG #0. In this case,
•
INIT #A has an exclusive monopoly over TARG #0.
•
Any commands issued to TARG #0 by any other SCSI device (INIT #B, TARG/INIT
#1) are rejected with a RESERVATION CONFLICT status, with the exception of an
INQUIRY, REQUEST SENSE or RELEASE command. The RELEASE command is
terminated normally, but TARG #0's reserve state is not influenced by it.
3 - 72
SCSI Bus
C141-E039-01EN
INIT
#B
TARG/INIT
#1
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