Оптимальное использование ресурсов системы

Hi, i can use english anyway. So, i have 2 disks, that are nearly die. That’s only reason i use raid6. I read theme about using raid or not, here. Using raid seems more profitable in long term perspective.
If i start node per each disk would all of them wait untill get 100 checkouts (or how it named, u should understand)?
Is anywhere a guide how to start multiple nodes on one machine?
Is there still a limit 1 processor core per node?