Red Hat CLUSTER FOR ENTERPRISE LINUX 5.0 Installation Guide Page 10
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Chapter 1. Red Hat Cluster Suite Overview
Clustered systems provide reliability, scalability, and availability to critical production services.
Using Red Hat Cluster Suite, you can create a cluster to suit your needs for performance, high
availability, load balancing, scalability, file sharing, and economy. This chapter provides an
overview of Red Hat Cluster Suite components and functions, and consists of the following sections:
Section 1.1, “Cluster Basics”
Section 1.2, “ Red Hat Cluster Suite Introduction”
Section 1.3, “ Cluster Infrastructure”
Section 1.4, “High-availability Service Management”
Section 1.5, “ Red Hat Global File System”
Section 1.6, “ Cluster Logical Volume Manager”
Section 1.7, “Global Network Block Device”
Section 1.8, “ Linux Virtual Server”
Section 1.9, “ Cluster Administration Tools”
Section 1.10, “ Linux Virtual Server Administration GUI”
1.1. Clust er Basics
A cluster is two or more computers (called nodes or members) that work together to perform a task.
There are four major types of clusters:
Storage
High availability
Load balancing
High performance
Storage clusters provide a consistent file system image across servers in a cluster, allowing the
servers to simultaneously read and write to a single shared file system. A storage cluster simplifies
storage administration by limiting the installation and patching of applications to one file system.
Also, with a cluster-wide file system, a storage cluster eliminates the need for redundant copies of
application data and simplifies backup and disaster recovery. Red Hat Cluster Suite provides
storage clustering through Red Hat GFS.
High-availability clusters provide continuous availability of services by eliminating single points of
failure and by failing over services from one cluster node to another in case a node becomes
inoperative. Typically, services in a high-availability cluster read and write data (via read-write
mounted file systems). Therefore, a high-availability cluster must maintain data integrity as one
cluster node takes over control of a service from another cluster node. Node failures in a high-
availability cluster are not visible from clients outside the cluster. (High-availability clusters are
sometimes referred to as failover clusters.) Red Hat Cluster Suite provides high-availability clustering
through its High-availability Service Management component.
Load-balancing clusters dispatch network service requests to multiple cluster nodes to balance the
request load among the cluster nodes. Load balancing provides cost-effective scalability because
Red Hat Ent erprise Linux 5 Clust er Suit e Overview
6
- Red Hat Enterprise Linux 5 1
- Cluster Suite Overview 1
- Edition 5 3
- Legal Notice 4
- Abstract 4
- Table of Contents 5
- Introduction 6
- 1.1. T ypographic Conventions 7
- 1.2. Pull-quot e Convent ions 8
- 2. Feedback 9
- 1.1. Clust er Basics 10
- 1.3.1. Clust er Management 13
- 1.3.2. Lock Management 14
- 1.3.3. Fencing 14
- Fig u re 1.7. C CS O verview 19
- 1.8. Linux Virt ual Server 30
- 1.8.3. Rout ing Met hods 35
- 1.8 .3.2 . Direct Ro ut ing 36
- 1.8 .4 .1 . Pe rsist e nce 38
- 1.8 .4 .2 . Fire wall Marks 38
- 1.9.1. Conga 39
- 1.10.1. CONTROL/MONITORING 47
- 1.10.2. GLOBAL SETTINGS 48
- 1.10.3. REDUNDANCY 50
- 1.10.4 . VIRTUAL SERVERS 51
- 2.1. Clust er Component s 59
- 2.2. Man Pages 63
- 2.3. Compat ible Hardware 65
- Revision History 66
- Revision Hist ory 67
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