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High latency from NVLOG transfer on GCP Cloud Volume ONTAP

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Category:
ontap-9
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perf
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Applies to

  • Cloud Volumes ONTAP for GCP
  • ONTAP 9

Issue

  • User workloads are slow to respond over any protocol (NAS or SAN).
  • Latency is seen in qos statistics volume latency show under the NVRAM column.
  • ::> qos statistics volume latency show
    Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync
    --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
    -total-              -   195.97ms   150.00us        0ms   796.00us        0ms        0ms  1195.03ms        0ms        0ms        0ms
    data1-wid30897   30897      1.60s   157.00us        0ms   818.00us        0ms        0ms      1.60s        0ms        0ms        0ms
    -total-              -   536.23ms   110.00us        0ms   495.00us        0ms        0ms   535.63ms        0ms        0ms        0ms
    data1-wid30897   30897        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms        0ms
    -total-              -      7.42s   136.00us        0ms   743.00us        0ms        0ms      7.42s        0ms        0ms        0ms
    data1-wid30897   30897  1137.67ms     1.65ms        0ms     3.55ms        0ms        0ms  1132.47ms        0ms        0ms        0ms

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