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00h Register When the command executes a Register service action, it registers a
reservation key with a device server without generating a reservation. The
device server holds these reservation keys from each initiator that performs
a PERSISTENT RESERVATION OUT command with a Register service
action until the key is changed by a new PERSISTENT RESERVATION
OUT command with Register service action from the same initiator, or until
the initiator registration is removed by:
• Powering down the logical unit, if the last Activate Persist Through Power
Loss (APTPL; see Figure 5-69 and Table 5-69) received by the device
server was 0;
• Performing a Clear service action;
• Performing a Pre-empt service action;
• Performing a Pre-empt and Clear service action; or
• Performing a Register service action from the same initiator with the
value of the service action reservation key set to 0.
When a reservation key has not yet been established or when the
reservation key has been removed, a reservation key of 0 is used when the
initiator performs a PERSISTENT RESERVATION OUT with the Register
service action. When the reservation has been removed, no information is
reported for the initiator in the Read Keys service action of the resulting
PERSISTENT RESERVATION IN command..
01h Reserve A PERSISTENT RESERVATION OUT command with Reserve service
action creates a persistent reservation with a specified Scope and Type.
Persistent reservations are not superseded by a new persistent reservation
from any initiator except by the execution of a PERSISTENT
RESERVATION OUT command that specifies either a Pre-empt or Pre-
empt and Clear service action. New persistent reservations that do not
conflict with an existing persistent reservation execute normally. Persistent
reservations of logical units or extents having the same Type value are
permitted if no conflicting persistent reservations are held by another
initiator. When these types of overlapping reservations are released, each of
the extent reservations and logical unit reservations are removed with a
separate Release service action. Multiple identical reservations from the
same initiator are all released simultaneously via a single Release service
action that matches the reservations.
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