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Flash Cacheの誤動作が原因でONTAPリブート後のレイテンシが高くなる

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perf<a>2009909884</a>
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環境

問題

ONTAPのリブート直後に高レイテンシが発生し、次の現象が発生しました。

  • ディスク使用率の増加
  • ディスクIOの遅延が大きい
  • Flash Cacheからのヒットなし(ext_cache)
  • Flash Cacheカードのステータス ok はになります。 sysconfig -a 
slot 1: Flash Cache NVMe Serial Number: ZEP00GPR Part Number: 119-00329 Hardware Revision: A0 Firmware Version: NA03 Model Name: X3311A Capacity: 1024 GB State: ok

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