D-Link DNR-326 User Manual - Page 81

Choose a RAID Level - storage

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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 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 DNR-326 User Manual 77

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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 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