Quantum DLT-S4 Guide de l'utilisateur télécharger pdf (Page 247)

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101

Chapter 4 SCSI Commands

PERSISTENT RESERVE IN Command (5Eh)

DLT-S4 Interface Reference Guide 213

Reservation Parameters —

Data Format

Table 116 Read Reservation

Parameters — Field

Descriptions

Bit

7 6 5 4 3 2 1 0

Byte

0 — 3

(MSB)

PRGeneration

(LSB)

4 — 7

(MSB)

Additional Length (n – 7)

(LSB)

8 — n

(MSB)

Reservation Descriptors

(LSB)

Field Description

PRGeneration Persistent Reservations Generation. The value in this field is a 32-bit counter in

the drive that is incremented each time a

PERSISTENT RESERVE OUT command

requests a Register, Clear, Preempt, Preempt & Abort, or Register & Move

operation. Note that

PERSISTENT RESERVE IN commands do not increment the

counter, nor do

PERSISTENT RESERVE OUT commands that perform a Reserve

or Release service action, or that are not performed due to an error or a

reservation conflict. The value in the Generation field is set to 0 as part of the

power-on self test process.

The value in the Generation field allows the application client that examines the

value to verify that another application client has not modified the configuration

of the initiators attached to a logical unit without notifying the application client

doing the examination.

1 2 ... 242 243 244 245 246 247 248 249 250 251 252 ... 385 386

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Quantum DLT-S4 Guide de l'utilisateur Page 247

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