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Command Specifications
196 C141-C013
(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
Byte
7 6 5 4 3 2 1 0
0 (MSB)
Generation
3 (LSB)
4 (MSB)
Additional Length (n-7)
7 (LSB)
8 (MSB)
First reservation key
15 (LSB)
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.
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Reservation
key list
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