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SFPの障害が原因のクラスタインターコネクトで高レイテンシが発生します

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環境

ONTAP 9

問題

  • ネットアップボリュームで高レイテンシが報告されました。 
  • QoS統計からクラスタインターコネクトからのレイテンシが報告されます。

cluster1::> qos statistics volume latency show -iterations 100
Workload        ID      Latency     Network    Cluster    Data      Disk     QoS       NVRAM  
--------------- ------ --------    --------   --------   --------  -------- -------- ----------
-total-                2320.45ms   109.00us  2320.02ms  327.00us  32.00us    0ms        0ms      
vdisk_vol1      111    2214.05ms   135.00us  2213.22ms  603.00us  89.00us    0ms        0ms     
vol2            1234   2701.12ms   238.00us  2700.56ms  191.00us  133.00us   0ms        0ms  

  • SFP障害のタイプによっては、EMSイベントがトリガーされるとは限りません
  • EMSログで次のエラーが報告されることがあります。

Mon Nov 21 08:31:41 +0900 [ST-BNC-5708N2: vifmgr: callhome.clus.net.degraded:alert]: Call home for CLUSTER NETWORK DEGRADED: Large MTU Packet Loss - Ping failures detected between cluster-02_clus2 ( xxx.xxx.xx.xx ) on Node2 and cluster-01_clus2 ( xxx.xxx.xxx.xxx ) on Node1

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