DLT4000 SCSI Interface
8-32 DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem
Parameter Control Bytes
Byte 2 of Log parameter block in Figure 8-15 is referred to as the parameter control
byte.
•
DU–Disable Update: DU bit is not defined for LOG SELECT and the target
ignores any value.
•
DS and TSD–Saving parameters is not supported; they both should be set to 1. If
the DS and/or TSD are set to zero, the command is terminated with CHECK
CONDITION status with the sense key set to ILLEGAL REQUEST with the
additional sense code set to INVALID FIELD IN PARAMETER LIST.
•
ETC–Enable Threshold Comparison: When set to 1, the drive will perform a
comparison with threshold values once the cumulative value is updated.
Comparison criteria is defined in TMC. If the comparison is met and the RLEC
bit of MODE SELECT/SENSE Control Page is set to 1, then a UNIT
ATTENTION
is
generated for all initiators. The additional sense code is set to
LOG EXCEPTION and the additional sense code qualifier is set to THRESHOLD
CONDITION MET. If the RLEC bit is zero and the comparison is met, then
UNIT ATTENTION
is not
generated.
•
TMC–Threshold Met Criteria: See Figure 8-23 for the list of criteria. Once the
specified criteria in this field is met and the ETC bit is 1 and the RLEC bit in
MODE SENSE/SELECT Control Page is set to 1, then UNIT ATTENTION is
generated for all initiators.
•
LP–List Parameter: This bit should always be set to 0 to indicate parameter codes
are treated as data counters.
Parameter Length
This field specifies the number of bytes of the parameter value.
Summary of Contents for DLT 4700
Page 1: ...DLTTM 4000 DLTTM 4500 DLTTM 4700 Cartridge Tape Subsystem Product Manual...
Page 2: ......
Page 160: ...Firmware Update From Tape 7 18 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 215: ...DLT4000 SCSI Interface DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem 8 55...
Page 304: ...DLT4000 SCSI Interface 8 144 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 342: ...Sense Key Information C 6 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 359: ...Index DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem 7...
Page 360: ...Index 8 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...