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How is SnapMirror lag time calculated?

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Applies to

  • ONTAP 9
  • SnapMirror

Answer

  • SnapMirror lag time is the difference between when the snapshot was created on the source and the system time on the destination
  • There are additional factors that can affect lag, including 
    • The timestamp on the last successfully transferred snapshot
    • The system time on the destination
    • The amount of time needed to transfer the snapshot from the source to destination
  • Example of how lag is calculated
    • A snapshot is created at 08:00
    • A scheduled SnapMirror update runs at 12:00
    • The transfer takes 15 minutes to complete
    • Lag time will be 4 hours and 15 minutes
      • How is that calculated? The difference between snapshot creation time and initiating the transfer is 4 hours, plus 15 minutes for the transfer to complete

 

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