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SCSI Commands

Quantum DLT 8000 Tape System 5-141

PERSISTENT RESERVATION IN Command (5Eh) (continued)

Table 5–64 Persistent Reservation Type Codes and Their Meanings

Code Name Description

0h READ Shared READS:

Shared; any application client on any initiator may execute commands

that perform transfers from the target to the initiator.

WRITES:

Prohibited; any command from any initiator that performs a transfer

from the initiator to the target results in a reservation conflict.

ADDITIONAL RESERVATIONS:

Allowed; any initiator may 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.

1h WRITE Exclusive READS:

Shared; any application client on any initiator may execute commands

that perform transfers from the target 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 target

results in a reservation conflict

ADDITIONAL RESERVATIONS: Allowed; any initiator may r

eserve the logical

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

target results in a reservation conflict

WRITES:

Shared; any application client on any initiator may execute commands

that perform transfers to the target from the initiator.

ADDITIONAL RESERVATIONS:

Allowed; any initiator may 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.

(continued)

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