RAID levels

Function/Applications

Advantages/Disadvantages

 

 

 

RAID Recovery

Function:

Advantages:

 

Identical (mirrored) data is

Provides high fault

 

stored on two drives.

tolerance.

 

Boosts the functionality of

Users can choose to mirror

 

RAID 1 with valuable

data continuously or on

 

features.

request.

 

Applications:

Data recovery is quick and

 

Any application that requires

easy.

 

 

 

a simple data protection

Allows hot-plugging of

 

method.

mirrored drive (with eSATA

 

 

or docking station HDD).

 

 

Enables easy migration to

 

 

non-RAID.

 

 

Disadvantages:

 

 

Only half of the total drive

 

 

capacity can be used for

 

 

storage.

 

 

Storage space may be

 

 

wasted if the capacities of

 

 

the primary and recovery

 

 

HDDs are different.

RAID 5

Function:

 

Distributes data across three

 

HDDs. If one HDD fails,

 

RAID 5 allows data to be

 

recovered from the other two

 

HDDs.

 

Applications:

 

A good choice for large

 

amounts of critical data.

Advantages:

Data redundancy

Improved performance and capacity

High fault-tolerance and read performance

Disadvantages:

During a RAID rebuild after a hard drive fails, system performance can be decreased.

RAID modes supported

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