AMCC 9500S 사용자 설명서

Chapter 1. Introduction to the 3ware Command Line Interface

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The process of removing a unit from a controller and 

putting it back later, either on the same controller, or a different one, and 
having it recognized as a unit. The disks may be attached to different ports 
than they were originally attached to, without harm to the data. 

For definitions of other terms used throughout the documentation, see the 
“Glossary”.

Available RAID Configurations

RAID is a method of combining several hard drives into one unit. It offers 
fault tolerance and higher throughput levels than a single hard drive or group 
of independent hard drives. RAID levels 0, 1, 10 and 5 are the most popular.  
AMCC's 3ware controllers support RAID 0, 1, 5, 6, 10, 50, JBOD and Single 
Disk. The information below provides a more in-depth explanation of the 
different RAID levels.

For how to configure RAID units, see “Configuring a New Unit” on page 96.

RAID 0 provides improved performance, but no fault tolerance. Since the 
data is striped across more than one disk, RAID 0 disk arrays achieve high 
transfer rates because they can read and write data on more than one drive 
simultaneously. The stripe size is configurable during unit creation. RAID 0 
requires a minimum of two drives.

When drives are configured in a striped disk array (see Figure ?), large files 
are distributed across the multiple disks using RAID 0 techniques. 

Striped disk arrays give exceptional performance, particularly for data 
intensive applications such as video editing, computer-aided design and 
geographical information systems. 

RAID 0 arrays are not fault tolerant. The loss of any drive results in the loss of 
all the data in that array, and can even cause a system hang, depending on 
your operating system. RAID 0 arrays are not recommended for high 
availability systems unless additional precautions are taken to prevent system 
hangs and data loss.