Biostar B660GTA - Инструкция по эксплуатации - Страница 43

Chapter 4: Useful help

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B660GTA

4.5

RAID Functions

RAID Definitions

In a RAID 0 system data are split up in blocks that get 

written across all the drives in the array. By using multiple 

disks (at least 2) at the same time, this offers superior I/O 

performance. This performance can be enhanced further by 

using multiple controllers, ideally one controller per disk.

Features and Benefits

•    Drives: Minimum 2, and maximum is up to 6 or 8. Depending on the platform.

•    Uses: Intended for non-critical data requiring high data throughput, or any environment 

that does not require fault tolerance.

•    Benefits: provides increased data throughput, especially for large files. No capacity loss 

penalty for parity.

•    Drawbacks: Does not deliver any fault tolerance. If any drive in the array fails, all data is 

lost.

•    Fault Tolerance: No.

•    Total Capacity: (Minimal. HDD Capacity) x (Connected HDDs Amount)

Data are stored twice by writing them to both the data disk 

(or set of data disks) and a mirror disk (or set of disks) . If 

a disk fails, the controller uses either the data drive or the 

mirror drive for data recovery and continues operation. You 

need at least 2 disks for a RAID 1 array.

Features and Benefits

•    Drives: Minimum 2, and maximum is 2. 

•    Uses: RAID 1 is ideal for small databases or any other application that requires fault 

tolerance and minimal capacity.

•    Benefits: Provides 100% data redundancy. Should one drive fail, the controller switches 

to the other drive.

•    Drawbacks: Requires 2 drives for the storage space of one drive. Performance is impaired 

during drive rebuilds.

•    Fault Tolerance: Yes.