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High write latency due to NVLog Transfer on MetroCluster SDS

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ontap-9
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dp
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Applies to

  • ONTAP 9
  • Metrocluster Software Defined Storage (MCC SDS)

Issue

  • High write latency on MCC SDS after Network configure VXLAN
  • From CLI, check using command qos statistics volume latency show

cluster::> qos statistics volume latency show -node test_node1

Workload        ID    Latency    Network    Cluster       Data       Disk      QoS      NVRAM      Cloud 

------------ ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -

volume_1      12578  15426ms      1ms        0ms         0.5us         1ms      0ms      123ms        0ms  

  • EMS shows alert:
Wed Jan 17 09:01:35 +0800 [PDC-SDC-ONTAP-MCC-A-02: pha_main001: mlm.excessive.TPlatency:notice]: Average latency of 250077us on target port 5302800000030000, has exceeded 250000us
Wed Jan 17 09:02:33 +0800 [PDC-SDC-ONTAP-MCC-A-02: pha_main000: mlm.excessive.TPlatency:notice]: Average latency of 250135us on target port 5301800000040000, has exceeded 250000us

 

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