[CentOS] RAID 5 setup?

Slack-Moehrle wrote:
> RAID 10 = 4 x 1.5 = 6tb - 1.5tb for parity data = 4.5tb per stripe then mirror it.
>   

no -1.5 on that.   you don't have parity when you are mirroring.      
8x1.5TB raid10 is simply 4*1.5 = 6TB     I'd still want hot spare.