I understand what RAID10 (2+2) is (stripped mirror) whereby there are data are striped across 2 groups and each group have a pair of mirror devices (2 disks).
This is how i have understand "2+2"
For RAID10 4+4, is it
- striping across 4 groups, each group still having 2 mirrored devices or
- striping across 2 groups, each group have 4 mirrored devices
- striping across 4 groups, each group have 4 mirrored devices
2 and 3 just doesn't make sense.
How is 1) a 4+4 then ?