Quantum DLT 2000, Product Manual

Page: 180 / 345

DLT2000 SCSI Interface
8-34 DLT2000/DLT2700 Cartridge Tape Subsystem
8.4.8 LOG SENSE (4Dh)
Bit
7 6 5 4 3 2 1 0
0 Operation Code (4Dh)
Logical Unit Number (0) PPC SP(0)
PC Page Code
Byte
(MSB)
Parameter Pointer
(LSB)
Unused
Reserved
Reserved
1
Flag Link
(MSB)
Allocation Length
(LSB)
Reserved
2
Reserved
3
4
5
6
7
8
9
Figure 8-17 LOG SENSED CDB
LOG SENSE allows the host to retrieve statistical information maintained by the device
about its own hardware or the installed media. It is a complementary command to LOG
SELECT.
PPC
The Parameter Pointer Control bit must be zero. A Parameter Pointer Control bit of
zero indicates that the parameter data requested from the device will start with the
parameter code specified in the Parameter Pointer field and return the number of bytes
specified in the Allocation Length field in ascending order of parameter codes from the
specified log page. A PPC bit of zero and a Parameter Point field of zero causes all
available parameter data for that page code to be returned to the initiator.
__________________________Note _____________________________
The current implementation of the Read/Write Compression Page does not
support a parameter pointer other than zero.
____________________________________________________________
If PPC bit is set or the Parameter Pointer is larger than the highest numbered parameter
on the page, then the target will terminate the command with CHECK CONDITION