Explanation
According to the web search results, when a DR Vault Server becomes an active vault, it will not automatically revert back to DR mode once the Primary Vault comes back online. The Vault administrator must manually set the DR Vault to DR mode by setting "FailoverMode=no" in the padr.ini file1. This file is located in the /opt/CARKaim/conf directory on the DR Vault machine2. The Vault administrator must also stop the replication process on the DR Vault and restart the PrivateArk Server service1. This procedure is known as a DR failback, which restores the original roles of the Primary Vault and the DR Vault after a failover1. The AllowFailback setting in the padr.ini file does not affect the DR failback process, as it only determines whether the DR Vault can be used as a backup for another DR Vault in a cascading DR scenario3.
The dbparm.ini file is not relevant for the DR failback process, as it contains the database parameters for the Vault server. References:
* Initiate a DR failback to the Production Vault - CyberArk
* Install the Disaster Recovery application - CyberArk
* Cascading DR - CyberArk
* [dbparm.ini file - CyberArk]