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CONTAP-56068: Nvlog replay of punch hole message might cause storage system disruption

  1. Last updated
    May 30, 2025
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36
Visibility:
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Category:
ontap-9
Specialty:
core
Last Updated:
5/30/2025, 10:36:39 AM

Issue

  • In some virtualization cases, the punch hole message is used to write special zero pattern blocks into the file. Using this mechanism depends on a volume-level flag being set.
  • Once the message execution completes, it is nvlogged. This is done to preserve the state until the consistency point (CP) writes the content to the disk.
  • If the system unexpectedly shuts down before CP completes, a replay of nvlogged messages will occur.
  • Due to an issue in ONTAP, during the nvlog replay, the volume-level flag to support this mechanism might not be set. This results in punch hole messages being disallowed, leading to a disruption during NVLog replay.
  • This issue exists in ONTAP 9.3 and higher.

 

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