Source: https://en.wikipedia.org/wiki/RAID#RAID_5_in_enterprise_environments

„RAID 5 is seriously affected by the general trends regarding array rebuild time and chance of failure during rebuild.[56]

In August 2012, Dell posted an advisory against the use of RAID 5 in any configuration and of RAID 50 with „Class 2 7200 RPM drives of 1 TB and higher capacity“.[64]

With a RAID 6 array, using drives from multiple sources and manufacturers, it is possible to mitigate most of the problems associated with RAID 5. The larger the drive capacities and the larger the array size, the more important it becomes to choose RAID 6 instead of RAID 5.[65] RAID 10 also minimizes these problems.[52]“

500px-RAID_5 500px-RAID_6

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