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scsi_extended_sense(9S) manual page Table of Contents

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scsi_extended_sense - SCSI extended sense structure

The scsi_extended_sense structure for error codes 0x70 (current errors) and 0x71 (deferred errors) is returned on a successful REQUEST SENSE command. SCSI-2 compliant targets are required to return at least the first 18 bytes of this structure. This structure is part of scsi_device(9S) structure.

Structure Members

u_chares_valid:1;/* sense data is valid */u_chares_class:3;/* Error Class-
fixed at 0x7 */u_chares_code:4;/* Vendor Unique error code */u_chares_segnum;/*
segment number: for COPY     cmd only */u_chares_filmk:1;/* File Mark Detected
*/u_chares_eom:1;/* End of Media */u_chares_ili:1;/* Incorrect Length Indicator
*/u_char es_key:4;/* Sense key */u_chares_info_1;/* information byte 1
*/u_chares_info_2;/* information byte 2 */u_chares_info_3;/* information
byte 3 */u_chares_info_4;/* information byte 4 */u_chares_add_len;/* number
of additional bytes */u_chares_cmd_info[4];/* command specific information
*/u_chares_add_code;/* Additional Sense Code */u_chares_qual_code;/* Additional
Sense Code     Qualifier */u_chares_fru_code;/* Field Replaceable Unit
Code */u_chares_skey_specific[3];/* Sense Key Specific information */

es_valid, if set, indicates that the information field contains valid information.

es_class should be 0x7.

es_code is either 0x0 or 0x1.

es_segnum contains the number of the current segment descriptor if the REQUEST SENSE command is in response to a COPY , COMPARE , and COPY command.

es_filmk, if set, indicates that the current command had read a filemark or setmark (sequential access devices only).

es_eom, if set, indicates that an end-of-medium condition exists (sequential access and printer devices only).

es_ili, if set, indicates that the requested logical block length did not match the logical block length of the data on the medium.

es_key indicates generic information describing an error or exception condition. The following sense keys are defined:

KEY_NO_SENSE

Indicates that there is no specific sense key information to be reported.

KEY_RECOVERABLE_ERROR

Indicates that the last command completed successfully with some recovery action performed by the target.

KEY_NOT_READY

Indicates that the logical unit addressed cannot be accessed.

KEY_MEDIUM_ERROR

Indicates that the command terminated with a non-recovered error condition that was probably caused by a flaw on the medium or an error in the recorded data.

KEY_HARDWARE_ERROR

Indicates that the target detected a non-recoverable hardware failure while performing the command or during a self test.

KEY_ILLEGAL_REQUEST

Indicates that there was an illegal parameter in the CDB or in the additional parameters supplied as data for some commands.

KEY_UNIT_ATTENTION

Indicates that the removable medium may have been changed or the target has been reset.

KEY_WRITE_PROTECT/KEY_DATA_PROTECT

Indicates that a command that reads or writes the medium was attempted on a block that is protected from this operation.

KEY_BLANK_CHECK

Indicates that a write-once device or a sequential access device encountered blank medium or format-defined end-of-data indication while reading or a write-once device encountered a non-blank medium while writing.

KEY_VENDOR_UNIQUE

This sense key is available for reporting vendor-specific conditions.

KEY_COPY_ABORTED

Indicates a COPY , COMPARE , and COPY command was aborted.

KEY_ABORTED_COMMAND

Indicates that the target aborted the command.

KEY_EQUAL

Indicates a SEARCH DATA command has satisfied an equal comparison.

KEY_VOLUME_OVERFLOW

Indicates that a buffered peripheral device has reached the end-of-partition and data may remain in the buffer that has not been written to the medium.

KEY_MISCOMPARE

Indicates that the source data did not match the data read from the medium.

KEY_RESERVE

Indicates that the target is currently reserved by a different initiator.

es_info_{1,2,3,4} is device type or command specific.

es_add_len indicates the number of additional sense bytes to follow.

es_cmd_info contains information that depends on the command which was executed.

es_add_code (ASC) indicates further information related to the error or exception condition reported in the sense key field.

es_qual_code (ASCQ) indicates detailed information related to the additional sense code.

es_fru_code (FRU) indicates a device-specific mechanism to unit that has failed.

es_skey_specific is defined when the value of the sense-key specific valid bit (bit 7) is 1. This field is reserved for sense keys not defined above.

Name

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Interface Level

Description

Structure Members

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