i myself wouldnt go with raid10 on all 8 disks, no hotspare, most propably all disks are of the same production series, in worst case with 'just' 2 failing disks you are going to lose all your data

if you need speed think about going with raid10 from 6disks and 2hotspares, or if safety is more important then raid6 with 7disks and 1hotspare