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PERSISTENT RESERVE IN Command (5Eh) SDLT 600 SCSI Interface Guide

4-138 January 2005 81-81200-02 REV A01

The following figure and table illustrate and describe the data fields of Read Reservations data

parameters.

Figure 4-78. PERSISTENT RESERVE IN Read Reservations Parameters — Data Format

Table 4-78. Read Keys Parameters — Field Descriptions

Field Name 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, Pre-empt, or Pre-empt & Clear 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.

Additional

Length

Contains the count of the number of bytes that are in the Reservation Key list

(bytes 8 – n). Note that this field contains the number of bytes in the reservation

key list regardless of the value prescribed by the Allocation Length field in the

command’s CDB.

Reservation

Keys

All of the Reservation Keys appear as items in a list as bytes 8 through n. Each

entry reflects an 8-byte reservation key registered with the drive using the

PERSISTENT RESERVE OUT Register or Register and Ignore Existing Key

service actions. The application client can examine each key for correlation

with a set of initiators and SCSI ports.

Bit

Byte

7 6 5 4 3 2 1 0

0 – 3

(MSB)

PRGeneration

(LSB)

4 – 7

(MSB)

Additional Length (n – 7)

(LSB)

8 – n

(MSB)

Reservation Descriptors

(LSB)

1 2 ... 175 176 177 178 179 180 181 182 183 184 185 ... 293 294

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