When Do Conflicts Between Existing Reservations And New Reservations Exist - Maxtor ATLAS 10K III Product Manual

SCSI Description
WRITE
Exclusive,
5h
Registrants
Only
Exclusive
Access,
6h
Registrants
Only
7h - Fh Reserved
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.
T a b l e 5 - 1 1 7 When Do Conflicts Between Existing Reservations and New Reservations Exist?
Persistent
Reservation
Being At-
tempted
LU
READ Shared
EX
LU
WRITE
Exclusive
EX
LU
READ
Exclusive
EX
LU
Exclusive
Access *
EX
5-94 Maxtor Atlas 10K III
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.
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.
2 G T U K U V G P V 4 G U G T X C V K Q P # N T G C F [ * G N F
READ WRITE READ
Shared Exclu- Exclu-
LU EX sive
LU EX LU EX
N N Y Y
N N Y O
Y Y Y Y
Y O Y O
Y Y Y Y
Y O Y O
Y Y Y Y
Y O Y O
N/A
Exclu- Shared
sive Access
sive Access
* LU EX
LU EX
Y Y Y Y N N
Y O Y O N N
Y Y Y Y Y Y
Y O Y O Y O
Y Y Y Y Y Y
Y O Y O Y O
Y Y Y Y Y Y
Y O Y O Y O
WRITE Exclu-
Exclu- sive
sive Access
* RO RO
LU EX LU EX
Y Y Y Y
Y O Y O
Y Y Y Y
Y O Y O
Y Y Y Y
Y O Y O
Y Y Y Y
Y O Y O