If you want to configure an Active-Passive cluster in Production, the first thing you need is a license allowing you to install Hot Backup or Cold Backup server. If so, for instance, if you are running a Denodo Platform 7.0, I would configure in the Solution Manager a Production environment selecting the Production license scenario, then I would add a Production server and finally I would add and additional server aimed to be used as a Hot Backup server. Note that this backup server should be included within your Production environment and the "Hot Backup" license scenario should be selected instead of the "Production" one.
I would also recommend that you take a look at this article: [How to configure a VDP Backup server in the Solution Manager](https://community.denodo.com/kb/view/document/How%20to%20configure%20a%20VDP%20Backup%20server%20in%20the%20Solution%20Manager?category=Installation+%26+Updates) as it further explains how to configure a backup server in the Solution Manager.
Besides this, if you own a Denodo support user I suggest you open a support case so the Support team will help you.
Hope this helps!