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由于网络上下文过载导致 NFS 延迟激增

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ontap-9
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适用于

  • ONTAP 9
  • Network File System (NFS)

问题

  • 在卷上观察到严重的 NFS 读取延迟峰值(>20ms)
  • 在延迟事件期间应用程序崩溃,影响了关键的金融应用程序
  • 看到以下 EMS 消息,并且在网络上下文中看到高利用率:
Wed Oct 07 22:20:16 +0200 [cluster01: kernel: net_cg_utilThresholdExceed_1:notice]: params: {'connection_group': '9', 'current_utilization': '96', 'configured_threshold': '95'}
Wed Oct 07 23:20:18 +0200 [cluster01: kernel: net_cg_utilThresholdExceed_1:notice]: params: {'connection_group': '9', 'current_utilization': '96', 'configured_threshold': '95'}
  • 所有会话都会出现大量流量:
  • ~2.8 GB CIFS 和 ~9.28GB NFS 发送到 NetApp
  • ~4.5 GB CIFS 和 ~8.02GB NFS 由 NetApp 接收

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