Installation guide

Functional Description
Manual No. 771971 2-15
Striping with Parity (RAID 3 and RAID 5)
Striping with parity (rotated XOR redundancy) is a method of providing
complete data redundancy that requires only a fraction of the storage
capacity than mirroring for storing redundant information.
In a system configured under RAID 3 or RAID 5 (which requires at least
three SCSI drives), all data and parity blocks are divided between the drives
in such a way that if any single drive is removed (or fails), the data on the
missing drive can be regenerated using the data on the remaining drives
(XOR refers to the Boolean “Exclusive-OR” operator).
Figure 2-9. Drive Group Mapped for Block Striping with Parity