HP Q153090901 4Dh, LOG SENSE

LOG SENSE 4Dh

LOG SENSE allows the host to read the drive’s logs. A single log is returned with each invocation of

LOG SENSE.

Pre-execution checks:

Illegal Field Deferred Error Unit Attention

The Page Code must match one of the supported log page codes. If it does not, then CHECK CONDITION status is reported. Sense data will be as described in the Illegal Field Checks.

Command descriptor block:

	7		6	5	4		3	2	1	0
0					Operation	Code (4Dh)
1				Reserved (0)					PPC (0)	SP (0)
2		PC					Page Code
3
					Reserved (0)
4
5
					Parameter Pointer
6
7	(MSB)				Allocation Length
8										(LSB)
9					Control

CDB fields:

PC	The Page Control field defines the type of log parameter to be returned:
	00b	Current Threshold Values—any parameters in the log that are counters contain
		the maximum value that they can count to.
	01b	Current Cumulative Values—any parameters in the log that are counters contain
		their current counts.
		NOTE: Counts are reset to their default cumulative values (see below) following a
		power-on, reset or bus device reset. Media related counts are also reset following
		a load.
	10b	Default Threshold Values—same as the Current Threshold Values
	11b	Default Cumulative Values—any parameters in the log that are counters contain
		the initial values of those counters (set at power-on, reset, bus device reset and, in
		the case of media logs, load).
	The PC field has no effect on the data returned when the selected log contains event or
	trace codes rather than counts.
Page Code	The Page Code field identifies which log page is being requested by the host. See
	page 59 for the list of valid page codes.

LOG SENSE 4Dh 57

Commands