VT8237 データシートの表示（PDF） - Unspecified

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VT8237

Bringing Serial ATA and RAID to the Mainstream

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VIA VT8237 South Bridge

Figure 4: The SATALite Interface

VIA DriveStation™ Parallel ATA-133 Controller

The VIA DriveStation™ Controller Suite also includes an enhanced IDE controller with

a dual channel DMA engine and interlaced dual channel commands, allowing for full

backwards compatibility with up to four Parallel ATA 133/100/66 devices delivering

data transfer rates of up to 133 MB/s.

RAID Explained

RAID (Redundant Array of Independent Disks) is a technology that harnesses the

power of multiple hard drives working together, and uses advanced data striping and

mirroring techniques to improve data integrity and access speed. Disk arrays are

groups of disk drives that work together to achieve higher data-transfer and I/O

rates than those provided by single large drives. An array is a set of multiple disk

drives plus a specialized controller (an array controller) that keeps track of how data

is distributed across the drives. In Striping, data for a particular file is written in

segments to the different drives in the array rather than being written to a single

drive.

Arrays can also provide Mirroring so that no data is lost if a single drive (physical

disk) in the array should fail. Different RAID ‘levels’ offer varying benefits to users,

for example RAID Level 0 significantly increases hard drive read/write speeds, while

RAID Level 1 provides rock solid data integrity, albeit with a performance trade off

compared to RAID Level 0. The key benefits of each RAID Level are summarized

below:

RAID Level 0 – A RAID 0 or ‘striping’ array organizes data in such a way that

it is striped across the multiple drives, enabling the system to access data

from multiple drives at the same time. The high-speed data access speeds are

especially beneficial for retrieving very large files, such as digital video files,

since they can be spread out effectively across multiple drives and accessed

in more manageable fragments or ‘stripes’. The downside to using RAID Level

0 configurations is that it sacrifices fault tolerance, as no room is made

available to store redundant data.

RAID Level 1 - RAID Level 1 uses a process called disk mirroring to ensure

data reliability, and can also enhance HDD read performance. In a RAID Level

Copyright © VIA Technologies, Inc, 2003.

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