WTF? Raid isn't generating the errors, your discs are. Also, I tend to use RAID 10 as it provides 100% redundancy and increased speed - theoretically 200% write and 400% read.LOL time for some warm fuzzies.
Ok so raid 5 has a an unrecoverable read error (URE) rate of about 1 every 12tb read. So if you have 3 3tb drives(aka 1 parity), you have a 50% chance in hell of not losing ALL of your data. If you have 3 6tb drives, you have an almost 100% chance of losing all your data. Hell move to raid 6, then you will at least have a 50% chance.
Raid for protection died a long time ago. You raid for speed now