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The option to "Initiate Recovery Drill" is likely grayed out because the launch settings were not retained after failing over and syncing back to the original primary region. When the launch settings are changed, it invalidates any previous recovery drills that were configured.
A few things you can try:
Verify that the launch settings are configured exactly the same as they were before failing over. This includes things like instance type, subnet, security groups etc.
If the launch settings need to be reconfigured, you will need to create a new recovery drill configuration. On the AWS Elastic Disaster Recovery console, go to the source server details page and select "Create recovery drill" to set this up.
Check the AWS documentation for details on how recovery drills work and the impact of changing launch settings. The drills are tied to the specific launch configuration, so any changes would require recreating the drill setup.
Consider taking snapshots of the launch settings for future reference, so they can be restored if needed after making changes.
The option to only show "Launch for Failback" makes sense in this case, since the previous drill configuration is now invalid.
Hi.
"Verify that the launch settings are configured exactly the same as they were before failing over" - I have done that manually.
"you will need to create a new recovery drill configuration" - I am struggling to see where that is done - there is no option like that in "Actions" on the Source Server details panel.
"Check the AWS documentation for details on how recovery drills work" - any chance of a link? I can see this (https://docs.aws.amazon.com/drs/latest/userguide/failback-overview.html#drill-recover-instance-faq) but no reference to "Create recovery drill" - I see this (https://docs.aws.amazon.com/drs/latest/userguide/failback-failover-region-region.html#failback-failover-region-region-failback) also - we are at point 2b - I also see a reference below that to "Performing a drill" - which looks like it is purely "Launch For Failback" but check then delete the resources - so no specific option to "Initiate Recovery Drill"