Dell PowerVault ML6000 - Manual (Page 82)

72 SCSI Commands
Information – This field returns additional information for certain ASC/ASCQs where a specific device must
be identified and the sense data is associated with a Unit Attention condition instead of a specific command.
These are described as follows:
• If the ASC/ASCQ is related to Import/Export stations, then byte 6 indicates which I/E station it
pertains to (1 to 4).
• If the ASC/ASCQ is related to a specific Data Transfer Element, then bytes 5 and 6 contain the
element address of that element.
• If the ASC/ASCQ is related to Towers, then byte 6 indicates which Tower it pertains to (1 to n).
Additional Sense Length – This field specifies the number of additional sense bytes that follow this field,
and returns 0Ah (10).
Command Specific Information – This field is not supported and returns 0000 0000h.
Additional Sense Code (ASC) – This field denotes a specific error condition. Additional information is
provided in the Additional Sense Code Qualifier (ASCQ) field.
Table 71 lists all the codes.
Additional Sense Code Qualifier (ASCQ) – This field provides additional information for the ASC. Refer
to
Table 71 for more information.
Field Replaceable Unit Code – This field is not used and returns zero.
Sense Key Specific Valid (SKSV) – This field returns a value of 1 if bytes 15-17 contain valid data for a
Sense Key of Illegal Request (05h). Otherwise this field returns 0.
Command/Data (C/D) – A value of 1 indicates that the illegal parameter was detected in the CDB. It returns
0 if the illegal parameter was detected in the data parameters. This field only applies if SKSV is 1.
Bit Pointer Valid (BPV) – A value of 0 indicates that the Bit Pointer field is not valid. A value of 1 indicates
that the Bit Pointer field is valid. This field only applies if SKSV is 1.
Bit Pointer – This field indicates which bit of the byte designated by the field pointer is in error. For a multi-
bit field, it points to the most significant bit of the field. This field only applies if SKSV is 1.
Field Pointer – This field indicates which byte of the CDB or Parameter List (starting with byte zero) was in
error. For a multi-byte field, the Field Pointer points to the most significant byte. This field only applies if
SKSV is 1.
Additional Sense Codes and Qualifiers
The following table lists the Additional Sense Codes (ASC) and Additional Sense Code Qualifiers (ASCQ)
associated with the reported Sense Keys. A sense key of 00h (no sense) has no ASC/ASCQ associated
with it. A few ASC/ASCQs can be associated with more than one sense key. The sense keys that can give
a particular ASC/ASCQ are indicated with an “x” in the appropriate column.
ASC/ASCQs that can indicate an abnormal element state as part of element descriptor information are
shown in bold.
Table 71 Additional Sense Codes and Qualifiers
ASC ASCQ
Sense Keys
Description
2 4 5 6 B
04h 00h x The library is not ready due to an unknown cause
04h 00h x LU Communication - SCSI Command Communication Failure
04h 01h x The library is becoming ready
04h 03h x The library is not ready and a manual intervention is required