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Are long Consistency Points (wafl.cp.toolong) normal?

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • Data ONTAP 7-mode

Answer

  • If no performance impact, then yes, the occasional long Consistency Point (CP) is normal and expected
  • It is recommended to check if latency is higher than expected
  • Sometimes long CPs occur frequently and a case may be opened to investigate further if the cause cannot be determined

Additional Information

  • ONTAP can do several background tasks in CP and will use the longer CP time:
  • If ONTAP is more idle, long CPs are expected to allow more priority for background work or write bursts
  • CPs happen asynchronously of the write path
    • Writes are acknowledged when written to NVRAM on both the local and partner node
    • Latency is unaffected as writes can be buffered until CP completion
    • This means latency will not be impacted as data stays in RAM for 30 or more seconds due to low write workload
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