User Manual

SCSI Commands Reference Manual, Rev. J 101
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.7 LOG SELECT command
The LOG SELECT command (see table 65) provides a means for an application client to manage statistical information
maintained by the SCSI target device about the SCSI target device or its logical units. Device servers that implement the LOG
SELECT command shall also implement the LOG SENSE command. Structures in the form of log parameters within log pages are
defined as a way to manage the log data. The LOG SELECT command provides for sending zero or more log pages via the
Data-Out Buffer. This manual defines the format of the log pages (see 5.2.2), but does not define the conditions and events that
are logged. Application clients should issue LOG SENSE commands prior to issuing LOG SELECT commands to determine
supported log pages and page lengths.
PCR (Parameter Code Reset) bit
The parameter code reset (PCR) bit instructs a device server whether or not to set parameters to their vendor specific default values (e.g., zero) as
described in table 68.
SP (Save Parameters) bit
The save parameters (SP) bit instructs a device server whether or not to save parameters to non-volatile memory as described in
table 68.
Table 65 LOG SELECT command
Bit
Byte
7 6 5 4 3 2 1 0
0 OPERATION CODE (4Ch)
1 Reserved PCR SP
2 PC PAGE CODE
3 SUBPAGE CODE
4 (MSB)
Reserved. . .
6 (LSB)
7 (MSB)
PARAMETER LIST LENGTH
8 (LSB)
9 CONTROL