HP Surestore 28/48-Slot with DLT7000 Digital Linear Tape SCSI-2 Drive and SCSI - Page 273

Appendix B, Initial Integration, ILLEGAL REQUEST with Additional Sense Codes of INVALID FIELD

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Programmer's Tips Initial Integration Using this information, the integrator can quickly determine what portion of the command or data sent to the target is causing the problem. For example, if the command descriptor bytes sent from the Initiator were 00 00 00 00 04 00, the drive recognizes this as a Test Unit Ready command with bit 2 of byte 4 set to 1. This bit is reserved and must be set to 0. The drive would then return a CHECK CONDITION status. The following Request Sense Command would contain a Sense Key of ILLEGAL REQUEST with Additional Sense Codes of INVALID FIELD IN CDB (24 00). • The SKSV (Sense Key Specific Valid) bit would be set to 1, indicating that Sense Key Specific data is available. • The C/D bit would be set to 1, indicating that the error is in the command descriptor block. • The BPV bit would be set to 1, indicating the Bit Pointer field is valid. • The Bit Pointer field would be set to 2, indicating the error is in bit 2. • The Field pointer would be 4, indicating the error is in bit 2 of byte 4. Appendix B B- 3

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Appendix B
B-3
Programmer’s Tips
Initial Integration
Using this information, the integrator can quickly determine what
portion of the command or data sent to the target is causing the problem.
For example, if the command descriptor bytes sent from the Initiator
were 00 00 00 00 04 00, the drive recognizes this as a Test Unit Ready
command with bit 2 of byte 4 set to 1. This bit is reserved and must be
set to 0. The drive would then return a CHECK CONDITION status. The
following Request Sense Command would contain a Sense Key of
ILLEGAL REQUEST with Additional Sense Codes of INVALID FIELD
IN CDB (24 00).
•
The SKSV (Sense Key Specific Valid) bit would be set to 1, indicating
that Sense Key Specific data is available.
•
The C/D bit would be set to 1, indicating that the error is in the
command descriptor block.
•
The BPV bit would be set to 1, indicating the Bit Pointer field is valid.
•
The Bit Pointer field would be set to 2, indicating the error is in bit 2.
•
The Field pointer would be 4, indicating the error is in bit 2 of byte 4.