Dell PowerVault TL2000 SCSI Reference Guide - Page 91

Response Code: A value of 70h indicates a current error the report is associated with the most recently received command. Response code value 71h (deferred errors) not implemented. No other values are returned. Segment Number: This byte contains the number of the current segment descriptor if the Request Sense command is the response to a Copy, Compare or Copy and Verify command. It is always zero. Filemark: This bit is only used in sequential access devices. It is always set to zero. EOM: The End Of Medium bit is for sequential-access and printer devices. This bit is always set to zero. ILI: An Incorrect Length Indicator indicates that the requested block length did not match the logical of the data on the medium. This bit is always set to zero. Sense Key, ASC, ASCQ: Sense Key, Additional Sense Code and Additional Sense Code Qualifier provide a hierarchy of information. The sense key provides generic categories in which error and exception conditions may be reported. Additional sense code provide further detail describing the sense code. Additional sense code qualifiers add further detail to the additional sense code. These bytes show detailed information about the error and exception conditions. See Chapter 7, "Sense Keys, ASC, and ASCQ," on page 7-1. Information: The contents of the information field is device-type or command specific. These bytes are always zero. Additional Sense Length: This field specifies the number of additional sense bytes to follow. If the allocation length of the command descriptor block is too small to transfer all of the additional sense bytes, the additional sense is not adjusted to reflect the truncation. SKSV: When the Sense-Key Specific Valid bit is set to zero the data in the Sense Key Specific field (Bytes 15, 16, and 17) do not contain valid data. When the SKSV bit is set to one bytes 15,16 and 17 contain additional information regarding the error condition. C/D: A command data (C/D) bit of one indicates that the illegal parameter is in the CDB. A C/D bit of zero indicates that the illegal condition is in the data parameters send by the host. BPV: A bit pointer valid (BPV) bit of zero indicates that the value in the Bit Pointer field is not valid. A BPV bit of one indicates that the Bit Pointer field specifies which bit of the byte specified in the Field Pointer field is in error. Field Pointer: The Field Pointer field indicates which byte of the cdb or parameter data was in error. Bytes are numbered starting from zero, as shown in the tables describing the commands and parameters. Possible Sense Keys Sense Key Name 0h NO SENSE 1h RECOVERED ERROR 2h NOT READY 4h HARDWARE ERROR Description Indicates that there is no specific sense key information to be reported. Indicates that the last command completed successfully with some recovery action performed by the device server. Indicates that the logical unit addressed cannot be accessed. Operator intervention may be required to correct this condition. Indicates that the device server detected a non-recoverable hardware failure (for example, controller failure, device failure, parity error, etc.) while performing the command or during a self test. Chapter 3. Supported SCSI Commands 3-77