Hitachi HUS151473VL3800 Specifications - Page 162
Parameter data for Read Keys
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17.12.2 Parameter data for Read Keys Table 96: PERSISTENT RESERVE IN, parameter data for Read Keys Bit Byte 7 6 5 4 3 2 1 0 (MSB) 0-3 Generation (LSB) (MSB) 4-7 (MSB) 8-15 Additional length (n-7) First reservation key (LSB) (LSB) (n-7) n (MSB) : Last reservation key (LSB) Generation is a counter that increments when PERSISTENT RESERVE OUT command with "Register" or "Preempt and Clear" completes successfully. Generation is set to 0 as part of the power on reset process and hard reset process. The Generation field contains a 32-bit counter that the Target shall increment every time a PERSISTENT RESERVE OUT command requests a Register, a Clear, a Preempt, or a Preempt and Abort service action. The counter shall 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. Regardless of the APTPL value the generation value shall be set to 0 as part of the power on reset process. The Additional Length field contains a count 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 shall be sent to the Initiator. The incremental remaining bytes shall be truncated, although the Additional Length field shall still contain the actual number of bytes in the reservation key list without consideration of any truncation resulting from an insufficient allocation length. This shall not be considered an error. The Reservation Key list contains the 8-byte reservation keys for all Initiators that have registered through all ports with the Target. Hitachi Confidential Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification 144
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