Citrix ADC

Node groups for spotted and partially striped configurations

By virtue of the default cluster behavior, all configurations performed on the cluster IP address are available on all nodes of the cluster. However, there might be cases where you need some configurations to be available only on specific cluster nodes.

You can achieve this requirement by defining a node group that includes the specific cluster nodes, and then binding the configuration to that node group. It ensures that the configuration is active only on those cluster nodes. These configurations are called partially striped or spotted (if active only one a single node). For more information, see Striped, Partially Striped, and Spotted Configurations.

For example, consider a cluster with three nodes. You create a node group NG0 that includes node n1 and another node group NG1 that includes n2 and n3. Bind load balancing virtual servers 0.77 to NG0 and load balancing virtual server 0.69 to NG1.

It means that virtual server 0.77 is active only on n1 and therefore only n1 receives the traffic that is directed to 0.77. Similarly, virtual server 0.69 is active only on nodes n2 and n3 and therefore only n2 and n3 receives traffic that is directed to 0.69.

Figure 1. Citrix ADC cluster with node groups configured for spotted and partial-striped configurations

Partial spotted

The entities or configurations that you can bind to a node group are:

  • Load balancing, content switching, cache redirection, authentication, authorization, and auditing virtual servers

    Note

    FTP load balancing virtual servers cannot be bound to node groups.

  • VPN virtual server (Supported from NetScaler 10.5 Build 50.10 onwards)
  • Global Server Load Balancing (GSLB) sites and other GSLB entities (Supported from NetScaler 10.5 Build 52.11 onwards)
  • Limit identifiers and stream identifiers
Node groups for spotted and partially striped configurations