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IO Error reported on ESXi due to faulty host end sfp

  1. Last updated
    Aug 26, 2024
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Category:
ontap-9
Specialty:
san
Last Updated:
8/26/2024, 5:45:00 PM

Applies to

  • Ontap 9
  • Brocade Switch
  • ESXi

Issue

  • IO errors reported on ESXi.
  • C3 discard errors reported on the host connected switch port.

portstatsshow output snippet- 

er_rx_c3_timeout        20876               Class 3 receive frames discarded due to timeout
er_tx_c3_timeout        0                   Class 3 transmit frames discarded due to timeout
er_unroutable           0                   Frames that are unroutable
er_unreachable          0                   Frame with unreachable destination
er_other_discard        20876               Other discards

  • Rx power reported on the switch port connected to host is not in the recommended range.

RX Power:    -10.7   dBm (84.6 uW)
TX Power:    -1.1    dBm (770.3 uW)
 

  • Isolate the issue further by following below steps-
    • Connect the cable from server to switch to a free switch port.
    • If Issues follows to the new switch port, then the faulty component could be either server end sfp or cable.
    • Start with cable replacement between the server and the switch port.
    • If issues persists post cable replacement between server and switch , then proceed with the solution.                

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