What is the difference between RAID 10 and RAID 0+1?
In both of these RAID implementations, both striping (RAID 0) and disk mirroring (RAID 1) are applied, thus making RAID 10 and RAID 0+1 combination arrays. A RAID 0+1 array consists of a stripe set (RAID 0) that is then mirrored, whereas a RAID 10 array consists of multiple mirrors (RAID 1) that are then striped. Although you may find that RAID 10 and RAID 0+1 are very similar, they are different in the way that each one writes data to the hard drives. In a RAID 0+1 configuration, data that is to be written to the hard drives is first written to a single RAID 0 configuration that is then duplicated or mirrored to another RAID 0 array, thus making both RAID 0 arrays an exact copy of one another giving you the RAID 1 portion of your array. In a RAID 10 configuration, data that is to be written to the hard drives is first of all broken into smaller blocks by the RAID controller, and then each smaller portion is written to a different RAID 1 array.
