It's simply to allow you to see what is required to install RAC and give you a system to experiment with. This is not, and should not be considered, instructions for a production-ready system.Of course, this will take more disk space. To add this, simply create double the amount of shared disks and select the "Normal" redundancy option when it is offered. There is no redundancy in the Grid Infrastructure installation or the ASM installation. This procedure provides a bare bones installation to get the RAC working.
Don't assume you will be able to run this on a small PC or laptop.
In previous releases I gave walk through of a manual installation, but this doesn't really make sense as you shouldn't be installing anything this way anymore, so instead I'm discussing a silent installation.
In addition, it allows you to set up shared virtual disks, overcoming the obstacle of expensive shared storage. Using VirtualBox you can run multiple Virtual Machines (VMs) on a single server, allowing you to run both RAC nodes on a single machine. A cheaper alternative is to use virtualization to fake the shared storage. In a production environment, shared storage is often provided by a SAN or high-end NAS device, but both of these options are very expensive when all you want to do is get some experience installing and using RAC.
One of the biggest obstacles preventing people from setting up test RAC environments is the requirement for shared storage. If you are comfortable with VirtualBox, Vagrant and RAC you might want to jump straight to the GitHub repository and use the basic instructions here. Silent Installation and Configuration : All Articles.Vagrant Oracle Real Application Clusters (RAC) Build.If you are wondering why there isn't a GUI version of this installation, please read Why no GUI installations anymore?