How can I best estimate rebuild times for a RAID 6 disk. The reason for this is that I need to decide how large disks that I will build my file storage on. Precondition is that the raid controller card is not working with anny thing else. I am aware that it is not an exact science but if anyone has an idea on a formula I would be grateful. The Solution is based on R730xd and JBOD's estimated total size is 4 PB.