Seeing lpfc events 0924 or 0730 "FCP Read Underrun" and/or "FCP command 0x12 failed" messages

Solution Verified - Updated -

Issue

  • Multiple logged 9024 events logged from lpfc into /var/log/messages:

     ... kernel: lpfc 0000:06:00.0: 0:(0):9024 FCP command x12 failed: x0 SNS x0 x0 Data: x8 x44 x0 x0 x0
     ... kernel: lpfc 0000:06:00.0: 0:(0):9024 FCP command xa3 failed: x0 SNS x0 x0 Data: x8 x4c x0 x0 x0
     ... kernel: lpfc 0000:06:00.0: 0:(0):9024 FCP command x12 failed: x0 SNS x0 x0 Data: x8 x44 x0 x0 x0
     ... kernel: lpfc 0000:06:00.0: 0:(0):9024 FCP command xa3 failed: x0 SNS x0 x0 Data: x8 x4c x0 x0 x0
     ... kernel: lpfc 0000:06:00.0: 0:(0):9024 FCP command x12 failed: x0 SNS x0 x0 Data: x8 x44 x0 x0 x0
    
  • (RHEL5 only) Messages containing Emulex event number 0730 are seen in the logs:

    ... kernel: lpfc 0000:10:00.0: 1:0729 FCP cmd x12 failed <0/217> status: x1 result: x2e Data: x5fe xc16
    ... kernel: lpfc 0000:10:00.0: 1:(0):0730 FCP command x12 failed: x0 SNS x0 x0 Data: x8 x2e x0 x0 x0
    ... kernel: lpfc 0000:10:00.0: 1:(0):0716 FCP Read Underrun, expected 96, residual 46 Data: x2e x12 x0
    
  • What do these errors mean?

  • What causes these errors?
  • How to prevent these errors?

Environment

  • Red Hat Enterprise Linux 5, 6, 7 and 8

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