Quantum 10K II - Manual (Page 188)

SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–121
PERSISTENT RESERVATION IN Command (5Eh) (continued)
Table 5–56 Persistent Reservation Type Codes and Their Meanings (continued)
Code Name Description
6h Exclusive
Registrants Only
READS: Exclusive; any command from an initiator that has not previously
performed a Register service action with the device server that
attempts a transfer from the disk results in a reservation conflict.
WRITES: Exclusive; any command from an initiator that has not previously
performed a Register service action with the device server 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 to not conflict
with any reservations already known to the
device server.
7h - Fh Reserved N/A