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CRC errors received on a single NIC port due to faulty switch end sfp

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ontap-9
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HW
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Applies to

  • ONTAP 9
  • FAS / AFF Systems
  • CRC errors reporting on a single port

Issue

  • Event log report hardware errors on a physical and/or logical port.

[node-01: vifmgr: vifmgr.cluscheck.crcerrors]: Port a0b on node node-01 is reporting a high number of observed hardware errors, possibly CRC errors
[node-02: vifmgr: vifmgr.cluscheck.crcerrors]: Port e0d on node node-02 is reporting a high number of observed hardware errors, possibly CRC errors
[node-02: vifmgr: vifmgr.cluscheck.hwerrors:alert]: Port e0d on node node-02 is reporting a high number (at least 1 per 1000 packets) of observed hardware errors (CRC, length, alignment, dropped)
[node-02: vifmgr: callhome.clus.net.degraded:alert]: Call home for CLUSTER NETWORK DEGRADED: CRC Errors Detected - High CRC errors detected on port e0d node node-02

  • ifstat output show CRC errors if ONTAP is receiving the errors.

RECEIVE
 Total frames:   36418m  | Frames/second:   23646  | Total bytes:       179t
 Bytes/second:      116m | Total errors:      170k | Errors/minute:    7
 Total discards:      0  | Discards/minute:     0  | Multi/broadcast:  1686k
 Non-primary u/c:     0  | CRC errors:        159k | Long frames:      0

 

  • CRC errors may be observed on a switch port or client side and latency may be seen due to packet loss

2022-03-20T17:39:36.443Z cpu36:2098075)WARNING: ScsiDeviceIO: 1498: Device naa.600a09803830574c4d5d53ddf26c4543 performance has deteriorated. I/O latency increased from average value of 18171 microseconds to 1816780 microseconds.

 

  • Run ifstat -z on the NetApp end to clear the stats on the affected node and check for incrementing errors.

 

  • Below steps can be followed to isolate the issue further-
    • CRC errors indicate an issue with the media (such as a badly seated, broken cable and SFP )
    • Perform a port isolation test to ensure port is in good health.
    • Verify  the health of the connection between the port reporting error and the next device in the link. 
    • Try reseating both ends of the cable.
    • Toggle the port to see determine if issue is resolved
    • Reseat the SFP of both ends (one at a time).
    • Replace the connecting cable.
    • If issue is not fixed after SFP or cable replacement, proceed with solution.

 

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