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RAID Array and Server: Hardware and Service Comparison


RAID Level

Min. Num of Drives

Description

Strengths

Weaknesses

RAID 0

2
Data striping without redundancy
Highest performance
No data protection; One drive fails, all data is lost

RAID 1

2
Disk mirroring
Very high performance; Very high data protection; Very minimal penalty on write performance
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required

RAID 2

Not Used In LAN
No practical use
Previously used for RAM error environments correction (known as Hamming Code ) and in disk drives before the use of embedded error correction
No practical use; Same performance can be achieved by RAID 3 at lower cost

RAID 3

3
Byte-level data striping with dedicated parity drive
Excellent performance for large, sequential data requests
Not well-suited for transaction-oriented network applications; Single parity drive does not support multiple, simultaneous read and write requests

RAID 4

3 (not widely used
Block-level data striping with dedicated parity drive
Data striping supports multiple simultaneous read requests
Write requests suffer from same single parity-drive bottleneck as RAID 3; RAID 5 offers equal data protection and better performance at same cost

RAID 5

3
Block-level data striping with distributed parity
Best cost/performance for transaction-oriented networks; Very high performance, very high data protection; Supports multiple simultaneous reads and writes; Can also be optimized for large, sequential requests
Write performance is slower than RAID 0 or RAID 1

RAID 0/1

4
Combination of RAID 0 (data striping) and RAID 1 (mirroring)
Highest performance, highest data protection (can tolerate multiple drive failures)
High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required; Requires minimum of four drives


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11/28/14
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