Filter
Top Products
LOG SENSE 6.Command Specification
SONY AIT-5 drive SDX-1100V series Ver.1.0 6-15
Table 6-10: Log Page Format
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved Page Code
1 Reserved
2 (MSB)
3
Page Length (n-3)
(LSB)
Log Parameters (s)
4
x+3
The First Log Parameter
(Length x)
.
.
.
n-y
n
The Last Log Parameter
(Length y)
Page code: Identifies which page of data is being transferred. If the Page Code field value is reserved or not
implemented by the target, the target will terminate the command with a CHECK CONDITION status. The sense
key will be set to ILLEGAL REQUEST, and the ASC will be set to INVALID FIELD IN PARAMETER LIST.
Page Length: The Page Length field indicates the total number of bytes that follow this byte. The value returned
for this field depends on the value you specified for the Page Code and the Parameter Pointer in the CDB. This
value is independent of what you specified for the Allocation Length. A Page Length value that results in the
truncation of any parameter will cause the target to terminate the command with a CHECK CONDITION status.
The sense key will be set to ILLEGAL REQUEST and the ASC will be set to INVALID FIELD IN PARAMETER
LIST.
6.6.2. The Log Parameter Descriptor
Most log pages contain one or more special data structures called log parameters. These may be data counters
which record the occurrence of certain events, or they may be more complex structures which describe activities
or other events which occur within the device. Each parameter structure begins with a 4-byte parameter header
followed by one or more bytes of parameter structure data. The 4-byte header is shown below:
Table 6-11: Log Parameter
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB) Parameter Code
1 (LSB)
2 DU(0) DS (1) TSD(0) ETC (0)
TMC (00) LBIN LP
3 Parameter Length (n-3)
4 Parameter Value
n
Parameter Code: Identifies which parameter of data is being transferred. If the parameter code value is reserved
or not implemented by the target, then the target will terminate the command with a CHECK CONDITION status.
The sense key will be set to ILLEGAL REQUEST and the ASC will be set to INVALID FIELD IN PARAMETER
LIST.
The DU, DS, TSD, ET, TMC, and LP fields are collectively referred to as the control byte.
DU: The DU bit (Disable Update) is not defined for threshold values (indicated by the PC field of the LOG SENSE
CDB). The target will ignore the value of any DU bits in a LOG SELECT command. This field is not supported.
DS: The DS (Disable Save) bit informs the initiator that savable parameters are disabled (i.e. not supported), and
will always be 1. If it is 0 the command will terminate with a CHECK CONDITION status with sense key set to
ILLEGAL REQUEST and ASC of ILLEGAL FIELD IN PARAMETER LIST.