RAID 0 just stripes across multiple disks giving you better performance but no protection. In fact you'd be better off running the disks separately as one disk failure in a RAID 0 array means your file system is toast.
Even RAID5 isn't fool proof. I had an eight disk RAID5 volume fail several days ago when two disks went kaput witin 45 minutes of each other. Even if a hotspare disk was there to jump in I have my doubts the RAID5 volume would have finished initializing the drive before the second one died. It may even push the second disk to failure sooner with the increased disk activity as the volume is in degraded mode.