AlwaysOn Estimated Recovery Time (seconds)

Hi All,

Estimated Recovery Time (seconds) is not matching with actual fail-over recovery time. Is the two process different? Normal Redo catch-up and during a time of failover recovery?

Estimated Recovery Time (seconds)  -> 7000
Redo Queue Size -> 12 GB
Normal Redo Catch-up -> 2-3 hours
Manual Failover Redo Catch-up -> 2-3 minutes and database was online and accessible

We saw this behavior in non-prod VM machines and identified the process and fixed it which was generating huge REDO. But the recovery time number (7000 seconds) was a concern if we get such a real time scenario in production. So we tried a manual fail-over repro-ing the REDO scenario, but the secondary came online Synchronized and was accessible within 2-3 minutes.

Thanks,

-SreejitG