LSI 9690SA-8E-KIT Instalační příručka stáhnout pdf (Strana 20)

Chapter 1. Introduction to the 3ware Command Line Interface

12 3ware SATA+SAS RAID Controller Card CLI Guide, Version 10.2

technology, read performance during a sequential read operation is twice the

speed of a single drive.

The adaptive algorithms in TwinStor technology boost performance by

distinguishing between random read request and sequential read requests. For

the sequential read requests generated when accessing large files, both drives

are used with the drive heads simultaneously reading alternating sections of

the file. For the smaller random transactions, the data is read by a single

optimal drive head.

Figure 2. RAID 1 Configuration Example

RAID 5

RAID 5 provides performance, fault tolerance, high capacity, and storage

efficiency. It requires a minimum of three drives and combines striping data

with parity (exclusive OR) to restore data in case of a drive failure.

Performance and efficiency increase as the number of drives in a unit

increases.

Parity information is distributed across all of the drives in a unit rather than

being concentrated on a single disk (see Figure 3). This method avoids

throughput loss due to contention for the parity drive.

RAID 5 can tolerate one drive failure in the unit.

Figure 3. RAID 5 Configuration Example

(480 GB - 120 GB for parity)

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LSI 9690SA-8E-KIT Instalační příručka Strana 20