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SCSI Description
5-102 Maxtor Atlas 10K III
Persistent Reservation Type Codes and Their Meanings
0h READ Shared
READS: Shared; any application client on any initiator may execute com-
mands that perform transfers from the disk to the initiator.
WRITES: Prohibited; any command from any initiator that performs a trans-
fer from the initiator to the disk results in a reservation conflict.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-
cal unit, extents, or elements as long as the persistent reservations do not
conflict with any reservations already known to the device server.
1h
WRITE Exclu-
sive
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 any initiator other than the initiator
that holds the persistent reservation that attempts a transfer to the disk re-
sults in a reservation conflict
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-
cal 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 com-
mands that perform transfers to the disk from the initiator.
ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-
cal unit, extents, or elements as long as the persistent reservations do not
conflict with any reservations already known to the device server.
3h
Exclusive Ac-
cess
READS: Exclusive; any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer from the disk re-
sults in a reservation conflict.
WRITES: Exclusive; any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer to the disk results
in a reservation conflict.
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUT command with the Reserve service action from any initiator other
than the initiator holding the persistent reservation results in a reservation
conflict. The initiator that holds the persistent reservation can 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.
4h Shared Access
READS: Shared; any application client on any initiator may execute com-
mands that perform transfers from the disk to the initiator.
WRITES: Shared; any application client on any initiator may execute com-
mands that perform transfers to the disk from the initiator.
ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-
TION OUT command with the Reserve service action from any initiator other
than the initiator holding the persistent reservation results in a reservation
conflict. The initiator that holds the persistent reservation can 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.