RAID Level Comparison Table

Features	RAID 0	RAID 1	RAID 1E	RAID 5	RAID 5EE
Minimum # Drives	2	2	3	3	4
Data Protection	No Protection	Single-drive failure	Single-drive failure	Single-drive failure	Single-drive failure
Read Performance	High	High	High	High	High
Write Performance	High	Medium	Medium	Low	Low
Read Performance (degraded)	N/A	Medium	High	Low	Low
Write Performance (degraded)	N/A	High	High	Low	Low
Capacity Utilization	100%	50%	50%	67% - 94%	50% - 88%
Typical Applications	High End Workstations, data logging, real-time rendering, very transitory data	Operating System, transaction databases	Operating system, transaction databases	Data warehousing, web serving, archiving	Data warehousing, web serving, archiving

Features	RAID 6	RAID 10	RAID 50	RAID 60
Minimum # Drives	4	4	6	8
Data Protection	Two-drive failure	Up to one disk failure in each sub-array	Up to one disk failure in each sub-array	Up to two disk failure in each sub-array
Read Performance	High	High	High	High
Write Performance	Low	Medium	Medium	Medium
Read Performance (degraded)	Low	High	Medium	Medium
Write Performance (degraded)	Low	High	Medium	Low
Capacity Utilization	50% - 88%	50%	67% - 94%	50% - 88%
Typical Applications	Data archive, backup to disk, high availability solutions, servers with large capacity requirements	Fast databases, application servers	Large databases, file servers, application servers	Data archive, backup to disk, high availability solutions, servers with large capacity requirements

Types of RAID Arrays

Types of RAID	Software-Based	Hardware-Based	External Hardware
Description	Best used for large block applications such as data warehousing or video streaming. Also where servers have the available CPU cycles to manage the I/O intensive operations certain RAID levels require. Included in the OS, such as Windows®, Netware, and Linux. All RAID functions are handled by the host CPU which can severely tax its ability to perform other computations.	Best used for small block applications such as transaction oriented databases and web servers. Processor-intensive RAID operations are off-loaded from the host CPU to enhance performance. Battery-back write back cache can dramatically increase performance without adding risk of data loss.	Connects to the server via a standard controller. RAID functions are performed on a microprocessor located on the external RAID controller independent of the host.
Advantages	Low price Only requires a standard controller	Data protection and performance benefits of RAID More robust fault-tolerant features and increased performance versus software-based RAID	OS independent Build high-capacity storage systems for highend servers

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