Regarding RAID selection, there are lot of factors matters like what type of application that you want to use.
Yes you are correct that RAID 6 provides more safety compare to RAID 5 in terms of drive failure but you need to keep in mind that RAID 6 much slower compare to RAID 5 because due to double parity calculation write will take more time compare to read in case of RAID 6. So if your requirement is read intensive application then RAID 5 or RAID 6 will be ok.
Better to involve a Solution Consultant or Solution Architect and review your requirement - based on that you should go for your configuration.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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