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アグリゲートのCPの長さに問題があり、「wafl.cp.toolong:error」イベントが発生しました。

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環境

  • ONTAP 9
  • HDDディスクヲシヨウスルAll FASシステム

問題

  • wafl.cp.toolong エラーメッセージが記録され、アグリゲートでレイテンシの問題が発生しています。

Tue Oct 17 09:34:07 +0000 [node01: wafl_exempt01: wafl.cp.toolong:error]: Aggregate aggr1 experienced a long CP.
Tue Oct 17 09:34:47 +0000 [node01: wafl_exempt11: wafl.cp.toolong:error]: Aggregate aggr1 experienced a long CP.
Tue Oct 17 09:35:37 +0000 [node01: wafl_exempt05: wafl.cp.toolong:error]: Aggregate aggr1 experienced a long CP.

  • EMSログで問題のアグリゲートについてディスク関連のエラーが報告されることがある:

Sun Dec 17 17:33:59 +0000 [Cluster01-01: disk_latency_monitor: shm.threshold.ioLatency:debug]:
Disk 1b.53.47 has exceeded the expected IO latency in the current window with average latency of 50 msecs and average utilization of 77 percent.
Highest average IO latency: 1b.53.47: 50 msecs; next highest IO latency: 1b.53.9: 10 msecs.
Disk 1b.53.47 Shelf 53 Drawer 4 Slot 11 Bay 47 [NETAPP   X375_SCMNE04TA07 NA00] S/N [1234abcd] UID [ABCD1234:EFGH5678:00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000]

  • statit コマンドでは、 同じRAIDグループ内の他のディスクよりも利用率が高いディスクが1つ以上報告されます。

1b.03.51      88  29.36   27.66   4.44 33792   1.47  61.25  1232   0.23  25.25   849   0.00   ....    .   0.00   
9b.10.52      25  31.66   30.00   3.93  2994   1.46  61.85   120   0.20  36.43   308   0.00   ....    .   0.00  

1a.05.55       1   1.85   0.00   ....    .   1.52  60.87   61   0.33  38.13   244   0.00   ....    .   0.00  
9a.02.54      81  29.30   27.74   4.13 29802   1.33  60.53  1069   0.23  22.25  1689   0.00   ....    .   0.00   

これは、バグ1444991と同じ問題ではありません。

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