Quantum DLT 2000, Руководство по эксплуатации продукта

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DLT2000 SCSI Interface
8-36 DLT2000/DLT2700 Cartridge Tape Subsystem
Page Code Page Description
00h
02h
03h
07h
32h List of Supported Pages Page
Write Error Counter Page
Read Error Counter Page
Last n Errors Events Page
Compression ratio page
Figure 8-19 LOG SENSE Pages Supported
Parameter Pointer
The Parameter Pointer field allows the host to specify at which parameter within a log
page the requested data should begin. For example, if a page supports parameters 0
through 5, and the Parameter Pointer field contains 3, then only parameters 3, 4, and 5
are returned to the initiator. Similarly, if a page supports parameters 1, 3, and 6, and the
Parameter Pointer field contains 2, then only parameters 3 and 6 are returned to the
initiator.
If Parameter Pointer is larger than the highest numbered parameter on the page, then the
target will terminate the command with CHECK CONDITION status. The sense key is
set to ILLEGAL REQUEST and the additional sense code is set to INVALID FIELD
IN CDB.
__________________________Note _____________________________
Parameters within a page are always returned in ascending order according to
parameter code.
____________________________________________________________
Allocation Length
The Allocation Length field is used to inform the target how much space the initiator
has allocated for data. There must be sufficient space allocated for all the requested
data, otherwise the command will terminate with a CHECK CONDITION Status with
Sense Key of ILLEGAL REQUEST, and ASC of INVALID FIELD IN CDB.
Error Detection Summary in LOG SENSE CDB
The following conditions constitute errors that will be detected by the drive in relation
to the CDB. The request sense data is set to ILLEGAL REQUEST, INVALID FIELD
IN CDB.
•
If a page is not supported
•
If the parameter pointer is larger than the highest numbered parameter on the page
•
If SP bit is set to 1