The only thing I'm going to say here is that IMO using RAID5 on disks that size is basically begging to lose the entire array. I had this happen.. twice I thin

The only thing I'm going to say here is that IMO using RAID5 on disks that size is basically begging to lose the entire array. I had this happen.. twice I think, back when 1TB drives were "big" for desktop use: A single drive suffers a fault of some kind - enough to kick the raid controller into thinking it needs to rebuild. The controller waits for you to replace the failed drive, and then diligently begins reading the data from the other drives as fast as it can.... putting them under increased load.... until a second drive fails... The larger the disk, the longer the restore time will be, the greater load put on the remaining disks, the greater the chance of a subsequent failure. If you're insistent on using traditional RAID, I'd recommend either RAID10, or at a push RAID6. But ideally I'd actually suggest zfs, and add pairs of disks as mirror vdevs to a pool.