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使用 CIFS 或 NFS 的间接流量时,CPU、集群延迟或集群端口利用率升高

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Category:
ontap-9
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perf
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适用于

  • ONTAP 9
  • CIFS
  • NFS

问题描述

  • 用户在访问共享时会遇到速度缓慢的问题。
  • 使用间接流量时观察到 CPU 升高,特别是 Network Exempt 的最大值。
    • 示例:
      • 运行 sysstat -M 命令会在 Nwk_ExmptNetwork Exempt CPU 域中显示高 CPU。
      • sysstat -x 1 输出显示 99% CPU,这意味着系统在 CPU 上已达到最大值,或者 Network Exempt 域已达到最大值。
    • 注意:为了便于阅读,本文中的输出缺少了一些列
Cluster::> set advanced Warning: These advanced commands are potentially dangerous; use them only when directed to do so by NetApp personnel. Do you want to continue? {y|n}: y Cluster::*> node run -node <node> sysstat -M 1 AVG Nwk_Exmpt 61% 994% 60% 988% 60% 974% 61% 971% Cluster::*> node run -node <node> sysstat -x 1 CPU 99% 99% 99%
  • 可能会从 Active IQ Unified Manager 中看到更高延迟被突破的警报
    • 示例:Cluster1_N6 上的延迟值为 12.2 ms/op,已触发基于阈值设置为 10.0 ms/op 的警告事件。
  • 由于来自 nwk_exempt 的高 CPU 使用率,无法执行升级。
  • 在集群网络中也可能看到高延迟
cluster1::> qos statistics volume latency show -iterations 100 Workload ID Latency Network Cluster Data Disk QoS NVRAM Cloud --------------- ------ -------- -------- -------- -------- -------- -------- ---------- ---------- -total- 110.35ms 0ms 110.02ms 327.00us 0ms 0ms 0ms 0ms vs1vol0 111 167.82ms 0ms 167.22ms 603.00us 0ms 0ms 0ms 0ms vol1 1234 117.76ms 0ms 117.56ms 191.00us 0ms 0ms 0ms 0ms

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