I have a OCZ Vertex 2 series 120GB SSD and getting another but need to know which raid I have to use to combine the capacity of both drives to get a total of 240GB?
Also which raid would I use if I were to get both drives with combined performance and capacity if its possible?
To answer exactly the question that was answered: Raid zero will combine the capacity of both drives (you will have 240 GB) and the performance (almost double the read and write throughput, not quite as good on IO per second).
However: With Raid 0, if you lose one drive the other is useless too. The data is split across the two drives, so if one fails you don't have the files that "were on the other." Back up frequently.