LSI 3ware SAS 9750-8i Uživatelská příručka stáhnout pdf (Strana 18)

Introducing the LSI 3ware SATA+SAS RAID Controller Card

6 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.0

Available RAID Configurations

RAID is a method of combining several hard drives into one unit. It can offer

fault tolerance and higher throughput levels than a single hard drive or group

of independent hard drives. LSI's 3ware controllers support RAID 0, 1, 5, 6,

10, 50, and Single Disk. The information below provides a more in-depth

explanation of the different RAID levels.

RAID 0

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 2), 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.

Figure 2. RAID 0 Configuration Example

RAID 1

RAID 1 provides fault tolerance and a speed advantage over non-RAID disks.

RAID 1 is also known as a mirrored array. Mirroring is done on pairs of

drives. Mirrored disk arrays write the same data to two different drives using

RAID 1 algorithms (see Figure 3). This gives your system fault tolerance by

preserving the data on one drive if the other drive fails. Fault tolerance is a

basic requirement for critical systems like web and database servers.

3ware uses a patented technology, TwinStor

, on RAID 1 arrays for improved

performance during sequential read operations. With TwinStor technology,

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LSI 3ware SAS 9750-8i Uživatelská příručka Strana 18

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