How is SnapMirror lag time calculated?
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
Additional Information