Raid 0+1 - Accusys ACS-8990 User Manual

Appendix B – Introduction to RAID levels

RAID 0+1

RAID 0+1 combines mirroring and striping functions on a minimum of four hard disks. Mirroring
provides full redundancy and protects data in case of multiple drive failure (providing that data
on one of each mirrored pair of drives is intact).
RAID 0+1: Combination of mirroring and striping
Characteristics:
This configuration provides optimal speed and reliability.
Requires even number of disks (minimum 4 disks)
The diagram below represents the writing of data on a RAID 0+1 array composed of four HDDS
connected to the controller. The controller creates a RAID 0 array from two RAID 1 sub-arrays.
Arrangement of data blocks saved on a Level 0+1 array
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