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MetroCluster IP multiple remote disk failures due to latency

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Applies to

  • MetroCluster IP
  • ONTAP 9
  • Broadcom BES-53248 IP switches

Issue

  • Multiple remote drives fail due to latency:

[cl01-n01: disk_latency_monitor: shm.threshold.highIOLatency:error]: Disk 0v.i1.1L99 exceeds the average IO latency threshold and will be recommended for failure.

  • ISL ports on the Broadcom switches show excessive discards.
  • The output of command show fiber-ports optical-transceiver all on the Broadcom switches shows low input power on the ISL port SFPs.
                                                 Output   Input
Port    Physical Port/  Temp  Voltage  Current   Power    Power     TX     LOS
        Lane Number     [C]   [Volt]     [mA]    [dBm]    [dBm]     Fault
------  --------------  ----  -------  -------   -------  -------   -----  ---
0/9     0/9-Lane1       35.2    3.320      6.7    -1.302   -1.941   No     No
0/10    0/10-Lane1      35.2    3.296      6.7    -1.248   -1.884   No     No
0/13    0/13-Lane1      35.3    3.329     31.1    -2.439   -4.208   No     No
0/14    0/14-Lane1      33.2    3.357     34.3    -2.342   -4.590   No     No

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