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SCSI Commands

Quantum DLT 8000 Tape System 5-155

PERSISTENT RESERVATION OUT Command (5Fh) (continued)

Table 5-68 Persistent Reservation Type Codes and Their Meanings (continued)

Code Name Description

3h Exclusive Access READS: Exclusive; any command from any initiator other than the initiator

holding the persistent reservation that attempts a transfer from the

target results 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

target results in a reservation conflict.

ADDITIONAL RESERVATIONS:

Restricted; any PERSISTENT RESERVATION 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 commands

that perform transfers from the target to the initiator.

WRITES: Shared; ; any application client on any initiator may execute

commands that perform transfers to the target from the initiator.

ADDITIONAL RESERVATIONS:

Restricted; any PERSISTENT RESERVATION 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.

5h WRITE Exclusive,

Registrants Only

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 an initiator that has not previously

performed a Register service action with the device server that

attempts a transfer 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 to not conflict with any

reservations already known to the device

server.

(continued)

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