RAID promises speed and disaster prevention, but is it perfect? Viperlair look into this, as well as outlining some flavours of RAID.
Snip: "RAID undoubtedly offers more data protection than non-RAID disk systems. However, the management of the disks and the data distribution across them can be complex. Complex redundant systems can suffer failure, most often not a fault of the technology used or the design of the array, but most likely because of its failure to correctly apply these systems which leads to a single point of failure causing disastrous data loss."
Check?the article HERE