D-Link DNR-326 User Manual

Appendix A - Choose a RAID Level

Choose a RAID Level

There are several issues to consider when choosing the RAID level. The following summarizes some advantages,
disadvantages, and applications for each choice.

RAID 0

Advantage

• Implements a striped disk RAID Volume, meaning the data is broken down into blocks, and each block is written to a

separate disk drive

• I/O performance is greatly improved by spreading the I/O load across many channels and drives
• No parity calculation overhead is involved

Disadvantage

•  Not a true RAID because it is not fault tolerant
•  The failure of just one drive will result in all data in a RAID Volume being lost
•  Should not be used in mission critical environments

RAID 1

Advantage

• Simplest RAID storage subsystem design
• Can increase read performance by processing data requests in parallel since the same data resides on two different

drives

Disadvantage

• Very high disk overhead - uses only 50% of total capacity