Document farm configuration settings in SharePoint 2013

Check the below link from MS which will give you details on the existing farm. This would be useful when we are building up the Replicas of farm.

 

 http://technet.microsoft.com/en-us/library/ff645391%28v=office.15%29.aspx

I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.