Quantum 10K II - page 189

SCSI Description
5–122 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
PERSISTENT RESERVATION IN Command (5Eh) (continued)
Table 5-57 represents graphically all possible combinations of Persistent
Reservations Being Attempted when Persistent Reservations are already held for
each of the types of persistent reservations.
Table 5-57 When Do Conflicts Between Existing Reservations and New Reservations Exist?
Persistent Reservation Already Held
Persistent
Reservation
Being
Attempted
READ
Shared
LU EX
WRITE
Exclusive
LU EX
READ
Exclusive
LU EX
Exclusive
Access *
LU EX
Shared
Access *
LU EX
WRITE
Exclusive
RO
LU EX
Exclusive
Access
RO
LU EX
LU
READ
Shared
EX
N N
N N
Y Y
YO
Y Y
YO
Y Y
YO
N N
N N
Y Y
YO
Y Y
YO
LU
WRITE
Exclusive
EX
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
LU
READ
Exclusive
EX
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
LU
Exclusive
Access *
EX
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
LU
Shared
Access *
EX
N N
N N
Y Y
YO
Y Y
YO
Y Y
YO
N N
N N
Y Y
YO
Y Y
YO
LU
WRITE
Exclusive
RO
EX
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
O O
N N
N N
N N
N N
LU
Exclusive
Access RO
EX
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
Y Y
YO
N N
N N
N N
N N
KEY: LU = Logical Unit Scope
EX = Extent or Element Scope
RO = Registrants Only
* = Conflicts with all reservation requests
from other initiators.
N = No Conflict
Y = Conflict
O = Conflict occurs if extent or element overlaps with
existing extent or element reservation.