Pacemaker对你的环境没有特定的要求，这使得它支持任何的冗余配置，包括 Active/Active, Active/Passive, N+1, N+M, N-to-1 and N-to-N。

In this document we will focus on the setup of a highly available Apache web server with an Active/Passive cluster using DRBD and Ext4 to store data. Then, we will upgrade this cluster to Active/Active using GFS2.