Maxtor ATLAS 10K III Manual download pdf (Page 197)

SCSI Description

5–130 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives

PERSISTENT RESERVATION OUT Command (5Fh) (continued)

Table 5-60 presents the definitions of the characters of the available “Type” values from

the Type field of the PERSISTENT RESERVATION IN Read Reservations parameters.

Each of the codes provides handling instructions for READ operations, for WRITE

operations, and for subsequent attempts to establish persistent reservations (referred to

as “Additional Reservations Allowed” in the table).

Table 5–60 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 disk to the initiator.

WRITES: Prohibited; any command from any initiator that performs a

transfer from the initiator to the disk 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 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 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.

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

commands that perform transfers to the disk 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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Maxtor ATLAS 10K III Manual Page 197