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Table Table 5–68 presents the definitions of the characters of the available “Type”values from the Type field of the PERSISTENT RESERVATION IN ReadReservations parameters.Each of the codes provides handling instructions for READ operations, for WRITEoperations, and for subsequent attempts to establish persistent reservations(referred to as “Additional Reservations Allowed” in the table).
0h READ Shared READS: Shared; any application client on any initiator may execute
commands that perform transfers from the target to the initiator.
WRITES: Prohibited; any command from any initiator that perform s a transfer
from the initiator to the target results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
1h WRITE Exclusive READS: Shared; any application client on any initiator may execute
commands that perform transfers from the target to the initiator.
WRITES: Exclusive; any command from any initiator other than the init iator
that holds the persistent reservation that attempts a transfer to the
target results in a reservation conflict
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
2h READ Exclusive READS: Exclusive; any command from any initiator other than the initiator that
holds the persistent reservation that attempts a transfer from the
target results in a reservation conflict
WRITES: Shared; any application client on any initiator may execute
commands that perform transfers to the target from the initiator.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the
logical unit, extents, or elements as long as
the persistent reservations do not conflict
with any reservations already known to the
device server.
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