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Is there a way to estimate the migration time before running "vserver migrate start" command?

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snapmirror
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dp
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Answer

  • Currently, ONTAP does not have a dedicated command to accurately calculate the migration duration before executing vserver migrate start command.
  • Estimation Difficulty:
    • The migration time for SVM Data Mobility depends on multiple factors such as data volume, network bandwidth, system load, and concurrent business operations.
    • Even with parameters like Peer Intercluster bandwidth, Vserver capacity, and target SnapMirror configuration, it is difficult to provide an accurate prediction.
  • General Trends:
    • Lower network bandwidth or high concurrent I/O can significantly extend migration time.
    • Large data volumes with frequent changes require longer resynchronization time.
  • Past Case References (for indicative purposes only):
    • Small-scale migration (a few hundred GB): Within a few hours
    • Medium-scale migration (1TB – 10TB): From several hours to about one day
    • Large-scale migration (over 10TB): More than one day
      Note: Actual results may vary depending on environment-specific factors.
  • Recommendation:
    To obtain a more reliable estimate in your environment, perform a test migration with a smaller dataset and extrapolate the results for the full-scale migration.

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