<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>1.3. Types of Pacemaker Clusters</title><link rel="stylesheet" href="./Common_Content/css/default.css" type="text/css" /><meta name="generator" content="publican 1.6" /><meta name="package" content="Pacemaker-Pacemaker_Explained-1.1-en-US-1-0" /><link rel="home" href="index.html" title="Configuration Explained" /><link rel="up" href="ch-intro.html" title="Chapter 1. Read-Me-First" /><link rel="prev" href="s-intro-pacemaker.html" title="1.2. What Is Pacemaker?" /><link rel="next" href="s-intro-architecture.html" title="1.4. Pacemaker Architecture" /></head><body class=""><p id="title"><a class="left" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="https://fedorahosted.org/publican"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="s-intro-pacemaker.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="s-intro-architecture.html"><strong>Next</strong></a></li></ul><div class="section" title="1.3. Types of Pacemaker Clusters"><div class="titlepage"><div><div><h2 class="title" id="s-intro-redundancy">1.3. Types of Pacemaker Clusters</h2></div></div></div><div class="para"> Pacemaker makes no assumptions about your environment, this allows it to support practically any <a href="http://en.wikipedia.org/wiki/High-availability_cluster#Node_configurations">redundancy configuration</a> including Active/Active, Active/Passive, N+1, N+M, N-to-1 and N-to-N. </div><div class="para"> <div class="figure" id="fig-redundancy-active-passsive"><div class="figure-contents"><div class="mediaobject" align="center"><img src="images/Pacemaker-active-passive.png" align="middle" width="444" alt="Active/Passive Redundancy" /><div class="caption">Two-node Active/Passive clusters using Pacemaker and DRBD are a cost-effective solution for many High Availability situations.</div></div></div><h6>Figure 1.1. Active/Passive Redundancy</h6></div><br class="figure-break" /> </div><div class="para"> <div class="figure" id="fig-redundancy-n-plus-one"><div class="figure-contents"><div class="mediaobject" align="center"><img src="images/Pacemaker-n-plus-1.png" align="middle" width="444" alt="N plus 1 Redundancy" /><div class="caption">By supporting many nodes, Pacemaker can dramatically reduce hardware costs by allowing several active/passive clusters to be combined and share a common backup node</div></div></div><h6>Figure 1.2. N plus 1 Redundancy</h6></div><br class="figure-break" /> </div><div class="para"> <div class="figure" id="fig-redundancy-n-to-n"><div class="figure-contents"><div class="mediaobject" align="center"><img src="images/Pacemaker-n-to-n.png" align="middle" width="444" alt="N to N Redundancy" /><div class="caption"> When shared storage is available, every node can potentially be used for failover. Pacemaker can even run multiple copies of services to spread out the workload. </div></div></div><h6>Figure 1.3. N to N Redundancy</h6></div><br class="figure-break" /> </div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="s-intro-pacemaker.html"><strong>Prev</strong>1.2. What Is Pacemaker?</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="s-intro-architecture.html"><strong>Next</strong>1.4. Pacemaker Architecture</a></li></ul></body></html>
