The major advantage of pooling the two types of RAID is the robustness of this model in terms of data security, fault tolerance thus obtained is impressive. We can lose the most hard on a RAID 15 (7 / 9 discs for example). It's the best RAID level in terms of fault tolerance and in terms of availability. But it is a RAID very expensive because of the high cost of controller cards that are suitable on the one hand, and because of storage capacity greatly reduced - with losses of more than 70% of the Total disk space in some configurations - on the other. The performance of these RAID types are not exceptional, but does not prove catastrophic for all. This is an excellent compromise for cases where safety is paramount.
However, most of the time, RAID 15 and 51 may be advantageously replaced by RAID 10. Indeed, a system requiring such security is always the question of the reliability of its equipment.
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