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Quantum DLT 7000 Tape System 5-33
LOG SELECT Command (4Ch) (continued)
Table 5–16 LOG SELECT Command Descriptor Block - Field Descriptions
Field Name Description
PCR Parameter Code Reset. If this bit is set to 1 and the parameter list length is set to 0,
all accumulated values of page codes 2, 3, and 32 are set to 0 and all threshold
values are set to default. If PCR is set to 1 and the parameter list length is set to a
non-zero value, the command terminates with a CHECK CONDITION status with
sense key of ILLEGAL REQUEST and an Additional Sense Code (ASC) of INVALID
FIELD IN CDB.
SP Save Page. Not supported, must be set to 0. If for some reason the Save Page bit is
set, the command terminates with a CHECK CONDITION status with a sense key of
ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB.
PC Page Control. This field defines the type of parameter values to be selected:
PC Type of Parameter Values
00b - Current Threshold Values
01b - Current Cumulative Values
10b - Default Threshold Values
11b - Default Cumulative Values
All of these types of values are changeable using LOG SELECT.
When the PC field is set to 00b or 01b and the Parameter List Length is set to 0, the
command terminates with a CHECK CONDITION status, Sense Key of ILLEGAL
REQUEST, and ASC of INVALID FIELD IN CDB. This occurs because modification of
Current Threshold Values and Current Cumulative Values is not supported.
When the PC field is set to 10b and the Parameter List Length field is set to 10b,
then all Current Threshold Values are reset to the Default Threshold Values. This is
equivalent to no change, since Threshold Values cannot be modified.
When the PC field is set to 11b and the Parameter List Length field is set to 0, then
all Current Cumulative Values are reset to the Default Cumulative Values. This is
equivalent to clearing all log pages that can be cleared.
Parameter
List Length
This field specifies the length, in bytes, of the LOG SELECT parameter list to be
transferred from the initiator to the target during the DATA OUT phase. A parameter
list length of 0 indicates that no data is to be transferred. This condition is not
considered an error.