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
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separate disk drive
I/O performance is greatly improved by spreading the I/O load across many channels and drives
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No parity calculation overhead is involved
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Disadvantage
Not a true RAID because it is not fault tolerant
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The failure of just one drive will result in all data in an RAID Volume being lost
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Should not be used in mission critical environments
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RAID 1
Advantage
Simplest RAID storage subsystem design
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Can increase read performance by processing data requests in parallel since the same data resides on two
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different drives
Disadvantage
Very high disk overhead - uses only 50% of total capacity
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D-Link DNR-322L User Manual
Choose a RAID Level
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