In a Layer 2 stretched environment where the default gateway resides on-premises, a " Forward policy " is used to route traffic from the cloud back to the data center. If the on-premises data center goes completely offline, the on-premises gateway is no longer reachable, which would halt all North-South communication for the VMs failed over to AWS. To restore full service, the administrator must not only failover the VMs to the NC2 cluster but also remove the Forward policy on the on-premises cluster (or specifically update the routing logic to ensure the AWS cluster takes over gateway duties). This allows the cloud cluster to stop attempting to tunnel traffic to the missing on-premises gateway and instead utilize local cloud-based exit points for network traffic, restoring external connectivity.

The Nutanix disaster recovery capabilities include recovery plans that define how entities are recovered in the event of a failure. There is a limit to the number of entities that can be managed within a single recovery plan.

Entity Limit:

According to Nutanix documentation, the maximum number of entities that can be recovered using a single recovery plan is 300. Exceeding this limit will cause issues during the execution of the recovery plan.

Impact of Exceeding the Limit:

If the number of entities in a recovery plan exceeds the supported limit, the recovery process may fail or not execute correctly, as observed in the scenario.

Nutanix Cloud Clusters on AWS Administration Guide

Nutanix Disaster Recovery Best Practices Documentation