Key Code Qualifier: Difference between revisions

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{{Short description|Type of SCSI error code}}

''{{redirect|KCQ redirects here. For |the radio station in Saginaw, Michigan, see [[|WKCQ]]''}}

'''Key Code Qualifier''' is a computer term used to describe an error-code returned by a [[SCSI]] device.

When a SCSI [[SCSI target|target]] device returns a [[SCSI check condition|check condition]] in response to a [[SCSI command|command]], the [[SCSI initiator|initiator]] usually then issues a [[SCSI Request Sense Command|SCSI Request Sense command]]. This process is part of a SCSI protocol called [[SCSI contingent allegiance condition|Contingent Allegiance Condition]]. The target will respond to the Request Sense command with a set of [[SCSI Request Sense Command|SCSI sense data]] which includes three fields giving increasing levels of detail about the error:

*K - sense key - 4 bits, (byte 2 of Fixed sense data format)

*C - additional sense code (ASC) - 8 bits, (byte 12 of Fixed sense data format)

*Q - additional sense code qualifier (ASCQ) - 8 bits, (byte 13 of Fixed sense data format)

The initiator can take action based on just the K field which indicates if the error is minor or major. However all three fields are usually logically combined into a 20 bit field called Key Code Qualifier or KCQ. The specification for the target device will define the list of possible KCQ values. In practice there are many KCQ values which are common between different SCSI device types and different SCSI device vendors. Common values are listed below, you should consult your hardware specific documentation as well.

==List of common SCSI KCQs==

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|rowspan="36" valign="top"|Soft Error||1||01||00||Recovered Write error - no index

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|1||02||00||Recovered no seek completion

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|1||5D||00||PFA threshold reached

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|rowspan="1315" valign="top"|Not Ready||2||04||00||Not Ready - Cause not reportable.

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|2||04||01||Not Ready - becoming ready

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|2||3A||02||Not Ready - medium not present - tray open

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|2||3A||03||Not Ready - medium not present - loadable

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|2||3A||04||Not Ready - medium not present - medium auxiliary memory accessible

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|2||4C||00||Diagnostic Failure - config not loaded

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|3||31||01||Medium Error - format command failed

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|rowspan="1923" valign="top"|Hardware Error||4||01||00||Hardware Error - no index or sector

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|4||02||00||Hardware Error - no seek complete

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|4||11||00||Hardware Error - unrecovered read error in reserved area

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|4||3115||0001||Hardware Error - reassignMechanical failedpositioning error

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|4||16||00||Hardware Error - Data Sync Mark error in reserved area

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|4||19||03||Hardware Error - defect list error in Grown List

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|4||31||00||Hardware Error - reassign failed

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|4||32||00||Hardware Error - no defect spare available

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|4||35||00||Hardware Error - enclosure services failure

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|4||35||01||Hardware Error - unsupported enclosure function

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|4||35||05||Hardware Error - enclosure services checksum error

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|4||3E||00||Hardware Error - logical unit has not self configured yet

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|4||3E||01||Hardware Error - logical unit failed

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|4||3E||02||Hardware Error - timeout on logical unit

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|4||3E||03||Hardware Error - self-test failed

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|4||3E||04||Hardware Error - unable to update self-test log

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|4||44||00||Hardware Error - internal target failure

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|5||21||00||Illegal Request - LBA out of range

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|5||24||00||Illegal Request - invalid field in [[SCSI CDB|CDB]] (Command Descriptor Block)

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|5||25||00||Illegal Request - invalid LUN

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|5||55||04||Illegal Request - Insufficient Registration Resources

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|rowspan="2143" valign="top"|Unit Attention||6||28||00||Unit Attention - not-ready to ready transition (format complete)

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|6||29||00||Unit Attention - POR or device reset occurred

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|6||3F||03||Unit Attention - inquiry parameters changed

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|6||3F||04||Unit Attention - component device attached

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|6||3F||05||Unit Attention - device identifier changed

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|6||3F||06||Unit Attention - redundancy group created or modified

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|6||3F||07||Unit Attention - redundancy group deleted

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|6||3F||08||Unit Attention - spare created or modified

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|6||3F||09||Unit Attention - spare deleted

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|6||3F||0A||Unit Attention - volume set created or modified

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|6||3F||0B||Unit Attention - volume set deleted

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|6||3F||0C||Unit Attention - volume set deassigned

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|6||3F||0D||Unit Attention - volume set reassigned

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|6||3F||0E||Unit Attention - reported LUNs data has changed

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|6||3F||0F||Unit Attention - echo buffer overwritten

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|6||3F||10||Unit Attention - medium loadable

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|6||3F||11||Unit Attention - medium auxiliary memory accessible

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|6||3F||12||Unit Attention - iSCSI IP address added

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|6||3F||13||Unit Attention - iSCSI IP address removed

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|6||3F||14||Unit Attention - iSCSI IP address changed

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|6||3F||15||Unit Attention - inspect referrals sense descriptors

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|6||3F||16||Unit Attention - microcode has been changed without reset

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|6||3F||17||Unit Attention - zone transition to full

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|6||3F||18||Unit Attention - bind completed

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|6||3F||19||Unit Attention - bind redirected

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|6||3F||1A||Unit Attention - subsidiary binding changed

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|6||5D||00||Unit Attention - PFA threshold reached

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| rowspan="2" |Data Protect

|Write Protect||7||27||00||Write Protect - command not allowed

|7

|20

|02

|Access Denied - No Access Rights

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|7||27||00||Write Protect - command not allowed
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|rowspan="1314" valign="top"|Aborted Command||B||00||00||Aborted Command - no additional sense code

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|B||1B||00||Aborted Command - sync data transfer error (extra ACK)

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|B||49||00||Aborted Command - inappropriate/illegal message

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|B||55||03||Aborted Command - insufficient resources

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|B||4B||00||Aborted Command - data phase error

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==References==

* [ftphttp://ftpwww.t10.org/t10lists/drafts/spc4/ SPCasc-4]num.htm clauseT10: 4.5.6SCSI andASC/ASCQ annex D.2Assignments]

[[Category:SCSI]]