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HP SureStore E Disk Array XP512/XP48 Owner's Guide

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HP SureStore E Disk Array XP512/XP48: Owner’s Guide
You will get more overall usable storage out of the array with a RAID5
implementation. RAID5 achieves the storage redundancy by generating
parity data based on the data stored. RAID5 only requires a 33% storage
overhead.
Table 15. RAID Array Usage and Overhead
RAID Type Disk Usage Overhead
RAID 0/1 2 disks + 2 disks 100%
RAID 5 3 disks + 1 parity drive 33%