Fujitsu M2488 LOG Select command 4Ch, LOG Select CDB Description, LOG Select Field Description

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

4-3.9 LOG SELECT command 4Ch

The LOG SELECT command provides a means for the initiator to manage statistical information maintained by the target about itself and attached logical units. It is a complementary command to the LOG SENSE command. Log data is collected within the target on a per event basis regardless of the initiator ID.

4-3.9.1 LOG SELECT CDB Description

LOG SELECT is a ten-byte command. The bytes are shown below and described in Table 4-29. Common fields are described in paragraph 4-3.1 on page 4-4.

								BITS
BYTES	7		6		5		4		3	2	1		0
0	0		1		0		0		1	1	0		0
1
				LUN					Reserved		PCR=1		0
2		PC							Reserved
3								Reserved
4								Reserved
5								Reserved
6								Reserved
7	MSB						Parameter List Length
8														LSB
9
						Reserved						Flag		Link

Note: Changeable fields in the CDB are shaded.

Table 4-29. LOG SELECT Field Description

BYTE	BIT	VALUE		DESCRIPTION
0	0-7		4Ch	Operation code.
1	1		1b	Parameter Code Reset (PCR)
2	6-7		01b	The Page Control (PC) field defines the type of parameter values to be
				selected. The only supported PC value is 01b (current cumulative values).
7-8			0	Parameter List Length

4-3.9.2 LOG SELECT CHECK CONDITION Status

A LOG SELECT command, with the parameter code reset bit (PCR) set, a PC of 01b, and a parameter list length of zero from any initiator, causes the target to reset parameters maintained in its Log pages.

Any values other than those indicated will result in CHECK CONDITION status with ILLEGAL REQUEST.

4-32 CG00000-011503 REV. A April 1997