RAID, or Redundant Array of Independent Disks, is a method for storing data on multiple hard disks, then linking the disks so that the operating system on your server views them as a single entity. These RAID configurations are the most used:
RAID-0: This type of RAID uses a method of data storage known as striping. The technology divides the data into pieces, and places each piece on a different drive. For instance, data piece A may be stored on Drive 1, while data piece B goes to Drive 2, C is on Drive 3, and so on. Because the data is divided, RAID-0 offers the top level of performance for disk IO. It is usually used for multimedia applications such as video editing and for situations where data loss is not as much a concern as is speed.
RAID-0 does not actually provide redundancy and therefore all data is lost if one of the drives fails. We strongly recommend that daily backups are performed if you choose this RAID level.
RAID-1: This type of RAID uses a method of data storage known as mirroring. This refers to the fact that every piece of data is written to at least two disks. As a result, RAID-1 offers a high degree of data security, but has a slight performance decrease because it requires capturing all data on two disks.