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The PERSISTENT RESERVATION OUT command is a 10-byte command used
to reserve a logical unit or an extent within a logical unit for the exclusive or
shared use by an initiator. Note that reservations are not persistent across power
cycles. The command is used in conjunction with the PERSISTENT
RESERVATION IN command; it is not used with the RESERVE and RELEASE
commands.
Persistent reservations conflict with reservations made via the RESERVE
command. Initiators that perform PERSISTENT RESERVATION OUT actions are
identified by a reservation key assigned by the application client. The client may
use the PERSISTENT RESERVATION IN command to identify which other
initiators within a system hold conflicting or invalid persistent reservations and use
the PERSISTENT RESERVATION OUT command to preempt those reservations
if necessary.
Note that since persistent reservations are not reset by the TARGET RESET task
management function or other global actions, they can be used to enact device
sharing among multiple initiators. The PERSISTENT RESERVATION OUT and
PERSISTENT RESERVATION IN commands provide the means for resolving
contentions in multiple-initiator systems with multiple port target. By using the
reservation key to identify persistent reservations, it is possible to determine which
ports hold conflicting persistent reservations and to take over such reservations
from failing or “greedy” initiators.
The figure that follows illustrates the format of the PERSISTENT
RESERVATION OUT command; the table that follows explains the data fields of
the command.