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リモートディスクでの断続的なレイテンシの急増とレイテンシ

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環境

  • ONTAP 9
  • AFF - A400
  • MetroCluster
  • ディスクX4013S17337T6NTE

問題

  • ESXi データストアでサービス停止に伴う一定の時間に高レイテンシが観察される
  • 問題の実行時にEMSログに次のメッセージが表示される

[XXXXXX-XX:wafl_exempt18: wafl.cp.toolong:error]: Aggregate XXXX_XXXX_aggr1 experienceda long CP

[XXXXXX -XX:disk_latency_monitor: shm.ssd.threshold.ioLatency:notice]: SSD 0v.i1.2L20 hasexceeded the expected block latency in the current timeframe with an averagelatency of 4670 us and an average utilization of 11 percent. The next highestSSD latency: 110 us. Disk 0v.i1.2L20 Shelf 10 Bay 22 [NETAPP  X4013S17337T6NTE NA53] S/N [S60RNA0R900618] UID[36305230:52900618:00253841:00000002:00000000:00000000:00000000:00000000:00000000:00000000 

  • P2フラッシュフェーズでほとんどの時間が経過した状態で、連続CPが観察されます。
  • レイテンシはリモートプレックスのいずれかのディスクによるものです。
  • 同じシェルフのモデル[X4013S17337T6NTE] のディスクで頻繁にディスク障害が発生する  

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