Production level or mode is a stage where a company's cluster environment is fully functional and actively serving its users or clients on a regular basis. It is no longer considered as a platform to learn Proxmox or a test platform to test different things on. A production level setup requires much advanced planning and preparation. This is because once the setup is complete and the cluster has been brought online, it just cannot be taken offline completely at a moment's notice, especially when users become dependent on it. A properly planned production level setup can save hours or days of headache. In this section, we will see how to preplan and choose the right equipment for a production level cluster.