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Slow Performance and High Disk usage after upgrading ONTAP

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ontap-9
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perf
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Applies to

  • FAS systems
  • Flash Cache Card installed and enabled

Issue

  • High disk latency after an ONTAP upgrade
  • Disk utilization is higher than before or even 100% busy
  • Reads are not using Flash Cache
  • The issue remains after the node being online for days or weeks

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