Fujitsu MBC2036RC, MBC2073RC Persistent Reserve in parameter data for Read Keys, Lsb Msb

Command Specifications

(2) PERSISTENT RESERVE IN parameter data for READ KEYS

The format for the parameter data provided in response to a PERSISTENT RESERVE IN command with the READ KEYS service action is shown in Table 4.25.

Table 4.25 PERSISTENT RESERVE IN parameter data for READ KEYS

Bit

7

6

5

4

3

2

1

0

Byte

0

(MSB)

~

~

Generation

~

3

(LSB)

Header

4

(MSB)

Additional Length (n-7)

~

~

~

7

(LSB)

8

(MSB)

First reservation key

~

~

~

15

(LSB)

Reservation

~

~

~

~

~

~

key list

n-7

(MSB)

Last reservation key

~

~

~

n

(LSB)

The "Generation" field shall contain a 32-bit counter maintained by the drive that shall be incremented every time a PERSISTENT RESERVE OUT command requests a REGISTER, a REGISTER AND IGNORE EXISTING KEY, a CLEAR, a PREEMPT, or a PREEMPT AND ABORT service action. When the PERSISTENT RESERVE IN command is executed, the RESERVE or RELEASE Service Action of the PERSISTENT RESERVE OUT command is executed, or the PERSISTENT RESERVE OUT command cannot be executed because of an error or RESERVATION CONFLICT, this counter is not updated. Regardless of the "APTPL" bit value the generation value shall be set to 0 in the power on reset process.

By referring to the value of the "Generation" field, an INIT can find out if the INIT configuration related to the logical unit has been changed by another INIT while the former INIT does not recognize such a change.

196 C141-C013