This might be a dump question, but I've been reading so much different things, that I'm not sure anymore. I tried to understand the concept of the Oracle RAC, so I've been reading the datasheet form Oracle. I thought I did understand the concept, but then I googled and I found some pictures wich were confusing, and now I'm not sure anymore.
The RAC concept is based on, that multiple (physical) servers share their memory (HD) and appear as one logical database. The data isn't stored in additional (physical) devices, like a nas? Am I right?