Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Instalační příručka stáhnout pdf (Strana 14)

However, this type of data synchronization does not optimally function if the configuration is overloaded

with users constantly uploading files or issuing database transactions. For a configuration with a high

load, a three-tier topology is the ideal solution.

1.2. A Three-Tier LVS Configuration

Figure 1.2, “A Three-Tier LVS Configuration” shows a typical three-tier LVS topology. In this example, the

active LVS router routes the requests from the Internet to the pool of real servers. Each of the real

servers then accesses a shared data source over the network.

Figure 1.2. A T hree-T ier LVS Configuration

This configuration is ideal for busy FT P servers, where accessible data is stored on a central, highly

available server and accessed by each real server via an exported NFS directory or Samba share. This

topology is also recommended for websites that access a central, highly available database for

transactions. Additionally, using an active-active configuration with Red Hat Cluster Manager,

administrators can configure one high-availability cluster to serve both of these roles simultaneously.

The third tier in the above example does not have to use Red Hat Cluster Manager, but failing to use a

highly available solution would introduce a critical single point of failure.

Chapter 1. Linux Virtual Server Overview

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Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Instalační příručka Strana 14