RAID LEVEL 10

   RAID 10 is a combination of RAID 1 and 0 and is often denoted as RAID 1+0. It combines the mirroring of RAID 1 with the striping of RAID 0. It's the RAID level that gives the best performance, but it is also costly, requiring two times as many disks of other RAID levels, for a minimum of four. This is the RAID level ideal for highly used database servers or any server that's performing many write operations. RAID 10 can be implemented as hardware or software but the general consensus is that many of the performance advantages are lost when you use software RAID 10. RAID 10 requires a minimum of four disks.

Graphical representation of the RAID layout: Raid Level 10