Combines the best of RAID 0 and RAID 1, data is striped
across four disks and mirrored to four disks
Four times the throughput (due to striping)
# redundant disks = # of data disks so twice the cost of one big disk
writes have to be made to both sets of disks, so writes would be only 1/2
the performance of RAID 0
What if one disk fails?
If a disk fails, the system just goes to the “mirror” for the data