I have been researching RAID (specifically RAID 5) for the last couple weeks. I have seen arguments for both sides, whether to use it, whether to use software versus hardware, and some arguments in between. I liked this post:
I already back my data up using manual methods. It is time consuming but doable. Plus, I'm learning how to implement rsync for backups, which should help a lot. So you could say that I'm not totally convinced I even want to employ RAID yet. But I want to think ahead just in case...
Here is my dilemma: I can't afford a nice hardware RAID controller with DDR and a processor, like the ARC-1210 described above. But at the same time I have only two SATA jacks on my board (yes, this was a mistake; I should have purchased a board with 4 or more jacks) and these are used up. I considered simply buying a SATA PCI card that would give me 4 or more additional SATA jacks. The thing is, I began seeing SATA/RAID cards in the $100-200 range and I started to reconsider.
So my question is, what is the best choice for adding SATA jacks but also getting a decent RAID controller (for instance, with on-board DDR)? Or should I just get a simple SATA card and decide whether I want RAID and then buy a good RAID controller when I can afford one?
EDIT
I think I should clarify my question a bit. I don't really need a detailed explanation on RAID. I already know enough that I know what I need. I have surveyed the literature. However, since there are so many options out there (from $15 to over $1000), I was asking for user-based experience. I need something that isn't a full-blown, high dollar, hardware RAID controller, but isn't just a $15 SATA card with four jacks either. I'd like something in the middle...