@RandomDamage @feld
at previous job we had hardware RAID5 and rebuilds did take a few hours, never more than a day though (because we didn't have any 14TB drives). And the iops during a rebuild were bearable.
At home I have a RAID1 now, but if I was adding more disks I'd go for RAID 5 or 6, so as not to waste half the space.