D-Link DNS-726-4 - Network Video Recorder Standalone..., Product Manual

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7 D-Lnk DNS-722-4/DNS-726-4 User Manual
Appendx 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, 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