Silicon Image SataRaid Uživatelská příručka stáhnout pdf (Strana 10)

Document Number: MAN-000SR5-000 Revision 1.40

Creating RAID Groups

Redundant Array of Independent Disks (RAID) technology allows one or more disks to be combined into a

logical volume, which provides greater performance and/or protection than standard disk drives. These

volumes, known as RAID Groups, appear like regular disk drives to the operating system and can be

partitioned, formatted and used just like any other disk. The RAID complexity is hidden within the driver.

Note: The maximum allowable size of a RAID group that can be created by the SATARAID5

Manager is 144,115,188,075,855,872 bytes (which represents 2

bit addressability). However,

some Linux platforms may limit the maximum size of a volume to 2TB, so the largest allowable size

of a RAID group is 2,199,023,255,552 bytes.

RAID Levels

There are several methods of combining disks, each with its own advantages and disadvantages. Each method

is referred to as a RAID “level,” such as RAID 1 or RAID 5. The details of each level are summarized below

and detailed in the following sections.

RAID Level Advantages Disadvantages

RAID 0 High performance, low cost. No data protection.

RAID 1 Excellent data protection. High cost.

RAID 5 Good data protection, good value. Performance degradation on writes.

RAID 10

High performance, excellent data

protection.

High cost.

Concatenated

Good performance, low cost, large

volume size.

No data protection.

JBOD Same as single disk. Same as single disk.

Disk Striping (RAID 0)

Striping is a performance-oriented, non-redundant data mapping technique. While Striping is discussed as a

RAID Group type, it is does not provide any fault tolerance. With modern SATA and ATA bus mastering

technology, multiple I/O operations can be performed in parallel, enhancing data throughput. Striping arrays

use multiple disks to form a larger virtual disk. The figure below illustrates a three-disk stripe set. Stripe one

is written to disk one, stripe two to disk two, and so forth. RAID 0 sets can include two, three, four or five

drives. If the sizes of the disk segments are different, the smallest disk segment will limit the overall size of

the RAID Group.

Stripe 0

Stripe 3

Stripe 6

Stripe 9

Stripe 1

Stripe 7

Stripe 10

Stripe 2

Stripe 8

Stripe 11

Stripe 4 Stripe 5

SATARAID5 Management Software User's Guide

Page 5

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