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6.Command Specification PERSISTENT RESERVE IN
6-58 SONY AIT-5 drive SDX-1100V series Ver.1.0
GENERATION: This field will contain a 32-bit counter maintained by the drive that will be incremented every time
a PERSISTENT RESERVE OUT command requests a REGISTER, a CLEAR, a PREEMPT, or a PREEMPT AND
ABORT service action. The counter will not be incremented by a PERSISTENT RESERVE IN command, by a
PERSISTENT RESERVE OUT command that performs a RESERVE or RELEASE service action, or by a
PERSISTENT RESERVE OUT command that is not performed due to an error or reservation conflict. The
generation value will be set to 0 as part of the power on reset process.
Additional Length: This filed contains a counter of the number of bytes in the Reservation key list. If the
allocation length specified by the PERSISTENT RESERVE IN command is not sufficient to contain the entire
parameter list, then only the bytes from 0 to the maximum allowed allocation length will be sent to the application
client. The incremental remaining bytes will be truncated, although the Additional Length field will still contain the
actual number of bytes in the reservation key list without consideration of any truncation resulting from an
insufficient allocation length. This will not be considered an error.
Reservation Key: The reservation key list contains the 8-byte reservation keys for all initiators that have
registered through all ports with drive.
The returned the parameter data provided in response to a PERSISTENT RESERVE IN command with the READ
RESERVATION service action has the following format:
Table 6-58: PERSISTENT RESERVATION IN parameter data for READ RESERVATION
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB) GENERATION
3 (LSB)
4 (MSB) Additional Length
7 (LSB)
8 (MSB) Reservation descriptor
23 (LSB)
GENERATION: This field will be defined for the PERSISTENT RESERVE IN READ KEYS parameter data.
Additional Length: This filed contains a counter of the number of bytes to follow in Reservation descriptor. If the
allocation length specified by the PERSISTENT RESERVE IN command is not sufficient to contain the entire
parameter list, then only the bytes from 0 to the maximum allowed allocation length will be sent to the application
client. The incremental remaining bytes will be truncated, although the Additional Length field will still contain the
actual number of bytes of Reservation descriptor and will not be affected by the truncation. This will not be
considered an error.
Reservation descriptor: The format of this field is defined in Table 6-59.
Table 6-59: PERSISTENT RESERVATION IN Reservation Descriptor
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB) Reservation Key
7 (LSB)
8 (MSB) SCOPE-SPECIFIC Address
11 (0 0 0 0) (LSB)
12 Reserved
13 SCOPE TYPE
14 Obsolete
15
The Reservation descriptor for each reservation will contain the Reservation Key under which the persistent
reservation is held. The TYPE and SCOPE of each persistent reservation as present in the PERSISTENT
RESERVE OUT command that created the persistent reservation will be returned.
SCOPE-SPECIFIC Address: The drive does not support an Element reservation. This field will be set to zero.