HP StorageWorks XP48 - Disk Array Owner's Manual page 101

RAID Technology
3D + 1P Array Group
D1 D2
D5
D6
D9 P
(7-9)
P D10
(10-12)
Figure 16. RAID5 with Parity Disk
The downside to RAID0/1 over RAID5 is that there is a 100% overhead on
storage redundancy associated with RAID0/1. RAID0/1 is often referred to
as mirrored storage, because the user data is physically duplicated in the
array.
D3 P
(1-3)
P D4
(4-6)
D7 D8
D11 D12
101