Quantum 10K II - Manual (Page 197)

SCSI Description
5–130 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
PERSISTENT RESERVATION OUT Command (5Fh) (continued)
Table 5-60 presents the definitions of the characters of the available “Type” values from
the Type field of the PERSISTENT RESERVATION IN Read Reservations parameters.
Each of the codes provides handling instructions for READ operations, for WRITE
operations, and for subsequent attempts to establish persistent reservations (referred to
as “Additional Reservations Allowed” in the table).
Table 5–60 Persistent Reservation Type Codes and Their Meanings
Code Name Description
0h READ Shared READS: Shared; any application client on any initiator may execute
commands that perform transfers from the disk to the initiator.
WRITES: Prohibited; any command from any initiator that performs a
transfer from the initiator to the disk 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 disk to the initiator.
WRITES: Exclusive; any command from any initiator other than the
initiator that holds the persistent reservation that attempts a
transfer to the disk 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 disk results in a reservation conflict
WRITES: Shared; any application client on any initiator may execute
commands that perform transfers to the disk 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.
(continued)