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SFP power value close to lower limit on storage

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Applies to

  • FAS/AFF systems
  • ONTAP 9
  • Fiber Channel (FC) 

Issue

  • FC link break, link flapping and/or FCP performance degradation.

 

  • network fcp adapter show on ONTAP CLI displays low TX power:

Received Optical Power    570.7 (uWatts)
SPF Transmitted Optical Power    123.8 (uWatts)

 

  • Low Rx power indicates an issue upstream to the storage port, i.e defective hardware incuding cable and sfp on the switch end.
  • Low Tx power indicates an issue on the storage port.

 

  • The below values are approximate values:

SFP Version

Light Value Ranges

Shortwave 2/4/8gb SFP Receive Power Range

Shortwave 2/4/8gb SFP Transmit Power Range

-6 dBm (250 uWatt) to -2 dBm (630 uWatt)

-6 dBm (250 uWatt) to 0 dBm (1000 uWatt)

Shortwave 4/8/16gb SFP Receive Power Range

Shortwave 4/8/16gb SFP Transmit Power Range

-5.2 dBm (300 uWatt) to 0 dBm (1000 uWatt)

-5.2 dBm (300 uWatt) to -1 dBm (790 uWatt)

Shortwave 8/16/32gb SFP Receive Power Range

Shortwave 8/16/32gb SFP Transmit Power Range

-4.6 dBm (340 uWatt) to 2 dBm (1580 uWatt)

-4.6 dBm (340 uWatt) to 2 dBm (1580 uWatt)

  • May occur in correlation:
    • Increasing error counters on switch ports
    • IO failures and/or timeouts on host OS
    • One or more failed paths from host OS
    • FC Target port on storage controller is in status <OFFLINE> or <LINK NOT CONNECTED>
    • Link resets/port resets

 

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