For both manual or automatic service migration, you may want to limit the choices of the servers to use as a transaction recovery service backup for a server in a cluster. For example, all servers in your cluster may not have access to the current server's transaction log files (stored in the default WebLogic store). For more information about migrating the transaction recovery service, see Transaction Recovery After a Server Fails.
To configure the list of candidate servers for transaction recovery service migration:
Note: You must include the original server in the list of chosen servers so that you can manually migrate the transaction recovery service back to the original server, if need be. The Administration Console enforces this rule.
Note: The servers you select must have access to the default persistent store for the current server, even in the event of a crash.