SCSI Primary Commands - 2.pdf

T10/1236-D Revision 20 18 July 2001The REPORT DEVICE IDENTIFIER parameter list (see table 98) contains a four-byte field that contains the lengthin bytes of the parameter list and the logical unit's identifier.Table 98 — REPORT DEVICE IDENTIFIER parameter listBitByte7 6 5 4 3 2 1 00 (MSB)1IDENTIFIER LENGTH (n-4)23 (LSB)4IDENTIFIERnThe IDENTIFIER LENGTH field specifies the length in bytes of the IDENTIFIER field. If the ALLOCATION LENGTH field inthe CDB is too small to transfer all of the identifier, the length shall not be adjusted to reflect the truncation. Theidentifier length shall initially equal zero, and shall be changed only by a successful SET DEVICE IDENTIFIERcommand.The IDENTIFIER field shall contain a vendor specific value. The value reported shall be the last value written by asuccessful SET DEVICE IDENTIFIER command. The value of the identifier shall be changed only by a SETDEVICE IDENTIFIER command. The identifier value shall persist through resets, power cycles, media formatoperations, and media replacement.The logical unit shall return the same Identifier to all initiators.Processing a REPORT DEVICE IDENTIFIER may require the enabling of a nonvolatile memory within the logicalunit. If the nonvolatile memory is not ready, the device server shall return CHECK CONDITION status, rather thanwait for the device to become ready. The sense key shall be set to NOT READY and the additional sense codeshall be set as described in table 117 (see 7.24). This information should allow the application client to determinethe action required to cause the device server to become ready.132 dpANS SCSI Primary Commands - 2 (SPC-2)