Choose A Raid Level - D-Link DNS-722-4 User Manual

Appendix A - 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, 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 an 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

D-Link DNS-722-4/DNS-726-4 User Manual

Choose a RAID Level

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