Fujitsu MAP3735 Read Reservations, Persistent Reserve in parameter data for Read Keys, Msb

3.1 Control/Sense Commands

3.1.18.1.2 READ RESERVATIONS

In the READ RESERVATION service action, the drive transfers the following information to the initiator as a parameter data list.

•Current generation value (See Section 3.1.18.2)

•Reservation keys registered by initiators that keep persistent reservations

•Scope value and type value

•Scope-specific address (only the Element scope)

When the READ RESERVATION service action is executed, if no persistent reservation is held by the drive, zero is set in the Additional Length field, which is transferred as parameter data, on the list.

3.1.18.2 PERSISTENT RESERVE IN parameter data for READ KEYS

The format for parameter data transferred in the READ KEYS service action of the PERSISTENT RESERVE IN command is shown below.

Bit

7

6

5

4

3

2

1

0

Byte

0

(MSB)

~

~

Generation

~

Header

3

(LSB)

4

(MSB)

~

~

Additional Length (n-7)

~

7

(LSB)

8

(MSB)

~

~

~

First reservation key-1

15

(LSB)

Reservation

~

~

~

~

~

~

key list

n-7

(MSB)

~

~

Last reservation key-m

~

n

(LSB)

The "Generation" field contains a 32-bit counter value maintained by the driver. This counter value is incremented every time the PERSISTENT RESERVE OUT command requests execution of the REGISTER, REGISTER AND IGNORE EXISTING KEY, CLEAR, PREEMPT, or PREEMPT AND ABORT service action.

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