Then you might be interested in SnapRAID
. It has tickled my interest, if I'm honest. It promises practically all the speed advantages of a software RAID setup, but none of the disadvantages.
Not a fan of RAID in general though. Mainly because I have inherited a software RAID setup (Linux), that often took so much time to rebuild that it would have been easier/faster to start from scratch from a backup. A few times even 48 hours or thereabout. And during those rebuilds you can't use that setup, so people started to work around it altogether. But the boss drunk from the cool-aid: "but data is much safer, because you can rebuild". So I must keep it alive.
In my view, the only thing RAID is good for: speed
But when (not if) problems arise, it will take much more effort and money to access data from drives that were part of a RAID setup....and that is if you are lucky. Most of the time content is not salvageable. Granted, that is a bigger problem with hardware RAID solutions than with software RAID solutions. Hardware RAID is practically always faster than a software RAID setup, so such solutions remain preferred by most. Yet those persons/companies forget that they must have a redundant identical hardware setup ready if they take their data serious. Or at least double the amount of (identical!) RAID cards, because if you don't, you easily reduce your already slim chance of getting any data back by 80%.
In short, a heavy price tag to slap on data. Companies that absolutely need all the speed for their systems to be able to do their core business without losing money, should consider RAID. All others can wait a second or two more for their data. Besides, nowadays more and more node-based software is appearing that is very fast from itself and truly excels when the network they are connected on is super fast. No hardware RAID can beat those speeds and these systems only need standard machines with standard OS's that are relatively easy to repair/exchange, without downtime. NoSQL databases like Apache Cassandra are a good example of this.
RAID is a yesteryear mindset. But, if you must, I do think that the concept behind SnapRAID is worthy of consideration.