You work for Netflix and need to setup a new RAID array for storing video files. These files will be streamed to end user, both speed and avoiding data loss are very important. Which RAID should be used to gain the highest redundancy and speeds?
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Answer Description
RAID 10 (also called RAID 1+0 and RAID "ten") combines the data mirroring of RAID 1 and the striping of RAID 0. This allows both protection and redundancy of data (RAID 1) and high data read speeds (RAID 0).
Wikipedia
Nested RAID levels, also known as hybrid RAID, combine two or more of the standard RAID levels (where "RAID" stands for "redundant array of independent disks" or "redundant array of inexpensive disks") to gain performance, additional redundancy or both, as a result of combining properties of different standard RAID layouts.Nested RAID levels are usually numbered using a series of numbers, where the most commonly used levels use two numbers. The first number in the numeric designation denotes the lowest RAID level in the "stack", while the rightmost one denotes the highest layered RAID level; for example, RAID 50 layers the data striping of RAID 0 on top of the distributed parity of RAID 5. Nested RAID levels include RAID 01, RAID 10, RAID 100, RAID 50 and RAID 60, which all combine data striping with other RAID techniques; as a result of the layering scheme, RAID 01 and RAID 10 represent significantly different nested RAID levels.
Nested_RAID_levels - Wikipedia, the free encyclopedia 