Inquiry Vital Product data, Mode Sense data

Cheetah 36XL Product Manual, Rev. E

Table 6 lists the Standard Inquiry command data that the drive should return to the initiator per the format given in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.

Table 6:	Cheetah 36XL family drive Standard Inquiry data

Bytes	Data (HEX)


0-15	00	00	[03]1	[12]2	8B	00	[01]	[3E]	53	45	41	47	41	54	45	20	VENDOR ID
16-31	53	54	[33]	[33]	[36]	[37]	[30]	[35]	[4C]	[43]3	20	20	20	20	20	20	PRODUCT ID
32-47	R#	R#	R#	R#	S#	S#	S#	S#	S#	S#	S#	S#	00	00	00	00
48-63	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00

64-79	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00
80-95	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00

96-111	00	43	6F	70	79	72	69	67	68	74	20	28	63	29	20	[32]	COPYRIGHT
112-127	[30]	[30]	[30]5	20	53	65	61	67	61	74	65	20	41	6C	6C	20	NOTICE
128-143	72	69	67	68	74	73	20	72	65	73	65	72	76	65	64	20

[ ]1	03 means SCSI-3 (Ultra160) implemented.
[ ]2	02 means response data in SCSI-3 (Ultra160) format. In addition, 12 indicates that the drive uses the hier-
	archical addressing mode to assign LUNs to logical units (default is 12).
R#	Four ASCII digits representing the last four digits of the product Firmware Release number. This informa-
	tion is also given in the Vital Product Data page C0h, together with servo RAM and ROM release num-
	bers.
S#	Eight ASCII digits representing the eight digits of the product serial number.
[ ]3	Bytes 18 through 25 reflect model of drive. The table above shows hex values for Model ST336705LC.
	Values for all models are listed below:
	ST336705LW	33	33	36	37	30	35	4C 57
	ST318405LC	33	31	38	34	30	35	4C 43
	ST318405LW	33	31	38	34	30	35	4C 57
	ST39205LC	33	39	32	30	35	4C	43	20
	ST39205LW	33	39	32	30	35	4C	57	20
[ ]5	Copyright Year - changes with actual year.

9.3.1Inquiry Vital Product data

Instead of the standard Inquiry data shown in Table 6, the initiator can request several Vital Product Data pages by setting the Inquiry command EVPD bit to one. The SCSI Interface Product Manual, part number 75789509, lists the Vital Product Data pages and describes their formats. A separate Inquiry command must be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.

9.3.2Mode Sense data

The Mode Sense command provides a means for the drive to report its operating parameters to the initiator. The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change- able values.

Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode Select command to set up new current and saved values, where the values are changeable.

Saved values are stored on the disk media using a Mode Select command. Only parameter values that are allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in the saved values list that are not changeable by the Mode Select command get their values from the default values storage.