1.3 Architectural Scenarios

Typical architectural scenarios for virtualized environments are illustrated in this section. You can use server and service virtualization at different levels to achieve your networking goals.

1.3.1 Only Service Virtualization

Novell Cluster Services can be installed on physical machines. Services are virtualized as cluster resources that can fail over between physical machines in the same cluster.

Figure 1-4 Service Resources on Physical Servers

1.3.2 Only Server Virtualization

Guest machines can be hosted on physical machines. No services are virtualized.

Figure 1-5 Guest Servers with No Clustering

1.3.3 NCS on Host Machines Managing Xen or KVM Guest Machines

Novell Cluster Services can be installed on host machines. Virtual machines are virtualized as cluster resources that can be failed over between physical machines in the same cluster. Nodes in the cluster run the same virtualization software, such as Xen or KVM.

Figure 1-6 Virtual Machines as Cluster Resources on Xen Hosts

This scenario is covered in Virtual Machines as Cluster Resources in the OES 11 SP2: Novell Cluster Services for Linux Administration Guide.

1.3.4 NCS Managing Services on Guest Machines

Novell Cluster Services can be installed on guest machines. Services are virtualized as cluster resources that can fail over between virtual machines in the same cluster.

Figure 1-7 Guest Machines as Cluster Nodes

1.3.5 NCS Managing Services on a Cluster of Physical and Guest Machines

Novell Cluster Services can be installed on guest machines or physical machines. Any combination of physical machines and virtual machines that are running the same operating system can be in the same cluster. Services are virtualized as cluster resources that can fail over between the nodes in the same cluster.

Figure 1-8 Physical and Guest Machines as Nodes in a Cluster