Troubleshooting

Troubleshooting & Diagnostics

Diagnostic Information

SKSV: 0 indicates the Sense Key Specific Bytes (bytes 15 through 17) are invalid. The C/D, BPV, and Bit Pointer fields will be zero. The top byte of the Field Pointer will be zero, and the bottom byte will contain a product-specific error code.

1 indicates the Sense Key Specific Bytes are valid. This will only happen when the bytes assume the role of Field Pointer Bytes as defined by ANSI. This occurs when an Illegal Field check detects an error in a command descriptor block or a Parameter List check detects an error in a command parameter list.

C/D: Command Data is only valid if the SKSV flag is set. 0 indicates the Field Pointer information applies to the parameter list for the command. 1 indicates the Field Pointer information applies to command descriptor block.

BPV: 0 indicates the Bit Pointer field is invalid. 1 indicates the Bit Pointer field is valid. If the SKSV bit is set then the BPV bit must be set also.

Bit Pointer: Identifies the bit position of the field in error, whether it is a command descriptor or a command parameter list field. Only valid when the SKSV flag is set.

Field Pointer/Drive Error Code: If SKSV is set, this field identifies in which byte of the command descriptor or parameter list an error was detected. Note that the drive scans from byte 0 bit 7 of a command or parameter list through to byte n bit 0. The field and bit pointers are set to point to the most significant bit of the field that is in error. If SKSV is not set, the top byte of this field will be zero. The bottom byte contains the drive error code associated with the failure of the previous command, or zero in the case of no failure and no appropriate error code.

CLN: 0 indicates the drive is OK. 1 indicates the drive requires cleaning.

Table 20. DDS Tape Module Sense Keys

Code Description

0h NO SENSE. There is no real problem. the sense information is probably indicating some condition such as encountering a filemark.

1h RECOVERED ERROR. An error has occurred from which the drive has recovered.

2h NOT READY. The drive is not in a state to be able to execute the request.

3h MEDIUM ERROR. The command failed, possibly because of a problem with the tape or an error in the recorded data.

4h HARDWARE ERROR. The command failed, possibly because of a problem with the drive hardware. The FRU in the sense data should indicate which part of the hardware is faulty.

5h ILLEGAL REQUEST. The last command sent to the drive or the data associated with the command violated conditions imposed by the drive on its acceptance.

6h UNIT ATTENTION. Indicates some condition of which the host needs to be made aware.

7h DATA PROTECT. A write command was attempted on a write-protected block.

8h BLANK CHECK. The drive encountered a blank tape or EOD while reading.

Bh ABORTED COMMAND. The drive has stopped trying to act on a command, usually through some problem on the SCSI bus.

Dh

VOLUME OVERFLOW. Physical EOT reached, unable to fit remaining information on a tape.

82