HP LH4r Novell NetWare Cluster Services for NetWare 5 Installation guide - Page 9

two Web sites. All the data, graphics, and e-mail messages for each Web site is stored on a shared disk subsystem connected to each of the servers in the cluster. The following figure depicts how this setup might look. Web Server 1 Web Site A Web Site B Web Server 2 Web Site C Web Site D Web Server 3 Web Site E Web Site F Fiber Channel Switch Shared Disk System During normal cluster operation, each server is in constant communication with the other servers in the cluster and performs periodic polling of all registered resources to detect failure. Suppose Web Server 1 experiences hardware or software problems and the users depending on Web Server 1 for Internet access, e-mail, and information lose their connections. The following figure shows how resources are moved when Web Server 1 fails. Web Server 1 Web Server 2 Web Site A Web Site C Web Site D Web Server 3 Web Site B Web Site E Web Site F Fiber Channel Switch Shared Disk System Chapter 1: Overview 3