RAID 0+1 - Combination of RAID 0 (data striping) and RAID 1 (mirroring). Optimize for Performance and Redundancy

RAID 0+1 combines the performance of RAID 0 with the redundancy of RAID 1.

To build a RAID 0+1 array, you first build a set of RAID 1 mirrored disks and you then combine these disk sets in a RAID 0 striped array.

A RAID 0+1 array can survive the loss of one disk from each mirrored pair. RAID 0+1 cannot survive the loss of two disks in the same mirrored pair.

RAID-10 and RAID-01 are not the same thing and it does matter. RAID-01 is a mirrored configuration of two striped sets. RAID-10 is a stripe across a number of mirrored sets.

RAID-10 provides better fault resilience and "rebuild" performance than RAID-01. Both array types provide very good to excellent overall performance by combining the speed of RAID-0 with the redundancy of RAID-1 without requiring parity calculations.

• Minimum number of drives: 4
• Strengths: Highest performance, highest data protection (can tolerate multiple drive failures).
• Weaknesses: High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required; Requires minimum of four drives.

DRIVE 1	DRIVE 2	DRIVE 3	DRIVE 4
Data A	Data A	mA	mA
Data B	Data B	mB	mB
Data C	Data C	mC	mC
Original Data	Original Data	Mirrored Data	Mirrored Data

RAID Levels instruction: RAID 0 - RAID 1 - RAID 2 - RAID 3 - RAID 4 - RAID 5 - RAID 0/1 (or RAID 10)

Types Of RAID: Hardware-based Raid | Software-based Raid