Redundant Array of Inexpensive Disks (RAID) is a type of protection available in Teradata. RAID provides Data protection at the disk Drive level. It ensures data is available even when the disk drive had failed.
Th\ere are around 6 levels of RAID ( RAID0 to RAID5) . Teradata supports Two levels of RAID protection
RAID 1 - Mirrored copy of data in other disk
RAID 5 - Parity bit (XOR) based Data protection on each disk array.
One of the major overhead's of RAID is Space consumption