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Persistent Reserve Out Command
Registering a Reservation Key
An initiator must register a key before performing any other Persistent Reserve Out
commands. To register a key, the initiator sends a Persistent Reserve Out command
with the Service Action field set to Register (0h), and the Parameter List length set to
18h. The Scope and Type fields will be ignored. In the parameter data, the
Reservation Key field is set to 0h, the Service Action Reservation Key is set to the
desired key value and the APTPL bit to 0h. If the initiator is already registered, the
key can be changed by sending the same command with the Reservation Key field set
to the current reserved key.
A key may be registered without regard to whether one had been previously
established by setting the Service Action field to Register and Ignore (06h).
Once an initiator has registered a key, it becomes a registered initiator and can
perform other Persistent Reserve functions.
Creating a Persistent Reservation
To create a Persistent Reservation, a registered initiator sends a Persistent Reserve
Out command with a Service Action field of Reserve (01h). The Scope field is set to 0,
the Type field to Exclusive Access (03h) or Exclusive Access Registrants Only (06h),
and the Parameter List Length to 18h. In the parameter data, the Reservation Key is
set to the currently registered key for this initiator, the Service Action Reservation
Key field is ignored, and the APTPL bit is set to zero.
A Type field of Exclusive Access will reserve the device for this initiator only. A Type
field of Exclusive Access, Registrants Only will allow access by all registered
initiators.
When a reservation of type Exclusive Access, Registrants Only is cleared, a unit
attention condition is established for the initiators holding the reservation.
Releasing a Persistent Reservation
To release a Persistent Reservation, a registered initiator sends a Persistent Reserve
Out command with a Service Action field of Release (02h). The Scope and Type fields
must match those used when making the reservation. The Parameter List Length is
set to 18h. In the parameter data, the Reservation Key is set to the currently registered
key for this initiator, the Service Action Reservation Key field is ignored and the
APTPL bit is set to zero.
When a reservation of type Exclusive Access, Registrants Only is released, a unit
attention condition is established for the other registered initiators.
Clearing all Persistent Reservations and Keys
To clear all Persistent Reservations and key registrations, a registered initiator sends a
Persistent Reserve Out command with a Service Action field of Clear (03h). The
Scope and Type fields are ignored. The Parameter List Length is set to 18h. In the
parameter data, the Reservation Key is set to the currently registered key for this
initiator, the Service Action Reservation Key field is ignored and the APTPL bit is set
to zero.
138 T10000: Interface Reference Manual
August 2016
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