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SCSI Description
5-94 Maxtor Atlas 10K III
Table 5-117 represents graphically all possible combinations of Persistent Reservations
Being Attempted when Persistent Reservations are already held for each of the types
of persistent reservations.
When Do Conflicts Between Existing Reservations and New Reservations Exist?
5h
WRITE
Exclusive,
Registrants
Only
READS: Shared; any application client on any initiator may execute com-
mands that perform transfers from the disk to the initiator.
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 log-
ical unit, extents, or elements as long as the persistent reservations to not
conflict with any reservations already known to the device server.
6h
Exclusive
Access,
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 log-
ical 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
Persistent
Reservation
Being At-
tempted
READ
Shared
LU EX
WRITE
Exclu-
sive
LU EX
READ
Exclu-
sive
LU EX
Exclu-
sive
Access
*
LU EX
Shared
Access
*
LU EX
WRITE
Exclu-
sive
RO
LU EX
Exclu-
sive
Access
RO
LU EX
LU
READ Shared
EX
N N
N N
Y Y
Y O
Y Y
Y O
Y Y
Y O
N N
N N
Y Y
Y O
Y Y
Y O
LU
WRITE
Exclusive
EX
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
LU
READ
Exclusive
EX
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
LU
Exclusive
Access *
EX
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O
Y Y
Y O