SCSI error: return code = 0x08000002 - Sense Key: Illegal Request

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux (RHEL)

Issue

The following messages are showing up in the log files

    kernel: sd 2:0:0:2: [sdf] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
    kernel: sd 2:0:0:2: [sdf] Sense Key : Illegal Request [current]

Resolution

Reach out to storage vendor or concerned support team responsible for storage to determine why the IO is being rejected by the SAN. Once reason is clear why IO is rejected then it will easier to understand and fix issue.

Root Cause

  • Sense Keys are messages generated by the storage target
  • These messages indicate that the server successfully submitted the IO to the target, but the target REJECTED our IO request with an error message.
  • This /may/ indicate that the LUNS have been unzoned from the system, but the system was not aware.

  • From the SCSI specification's description of this sense key:

    Sense Key
5h           ILLEGAL REQUEST.  Indicates that there was an illegal parameter in the 
             command descriptor block or in the additional parameters supplied as data 
             for some commands (FORMAT UNIT, SEARCH DATA, etc.).  If the target detects an 
             invalid parameter in the command descriptor block, then it shall terminate the
             command without altering the medium.  If the target detects an invalid parameter
             in the additional parameters supplied as data, then the target may have already
             altered the medium.  This sense key may also indicate that an invalid IDENTIFY
             message was received.

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