In particular any striped data RAID solutions, namely RAID 0.

How does RAID affect cache usage? Say you have two drives in RAID 0, each of which having 8mb cache, is the effective cache really 16mb because only half your data is going to each drive, so you can fit twice the total amount of data in the cache? Or is there some additional information required about the data that's being split, for synchronicity reasons or anything, that mean you don't have an effective doubling of cache effect?