It is time for me to come to conclusions ... If
different RAID levels are so numerous, the reason is simple: each system has strengths and weaknesses to be highlighted in depending on individual needs.
However, we must recognize that a compromise is often necessary.
In this regard, RAID 5 is frequently identified as the undisputed master of performance / cost ... However, the difficulties incurred in sizing bands write performance in most database systems, leading in fact rejected by the purists DBA ... Who
them undoubtedly will choose RAID 10, although more expensive, but ensuring consistent performance regardless of the access modes. A definite advantage when you can easily associate a better reconstruction speed data, a lower performance degradation in case of failure, better fault tolerance ... And to make installation easier!
Finally, we must not neglect the disks for the operating system, which undoubtedly deserves to enjoy a good RAID 1, inexpensive, and ideally meet the prerequisites for system availability.
So on your marks ... Set!
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