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.