Product Documentation

Striped, Partially Striped, and Spotted Configurations

Aug 31, 2016

By virtue of command propagation, all nodes in a cluster have the same configurations. However, you may want some configurations to be available only on certain cluster nodes. While you cannot restrict the nodes on which the configurations are available, you can specify the nodes on which the configurations are active.

For example, you can define a SNIP address to be active on only one node, or define a SNIP address to be active on all nodes, or define a VIP address to be active on only one node, or define a VIP address to be active on all nodes, or define a VIP address to be active only on two nodes of a 3-node cluster.

Depending on the number of nodes the configurations are active on, cluster configurations are referred to as striped, partially striped, or spotted configurations.

Figure 1. Three-node cluster with striped, partially striped, and spotted configurations


The following table provides more details on the types of configurations:
Configuration Type Active on... Applicable to... Configurations...
Striped configuration All the cluster nodes All entities No specific configuration required to make an entity striped. By default, all entities defined on a cluster IP address are striped on all the cluster nodes.
Partially striped configuration A subset of cluster nodes Refer "Node Groups" Bind the entities that you want to be partially striped, to a node group. The configuration will be active only on the cluster nodes that belong to the node group.
Spotted configuration Single cluster node
  • SNIP address
  • SNMP Engine ID
  • Hostname of cluster nodes
  • Entities that can be bound to a node group
A spotted configuration can be defined using one of two approaches.
  • SNIP address. When creating the SNIP address, specify the node on which you want the SNIP address to be active, as the owner node.

    Example:

    add ns ip 10.102.29.106 255.255.255.0 -type SNIP -ownerNode 2 (assuming node NS2 ID is 2)

    Note: You cannot change the ownership of a spotted SNIP address at run time. To change the ownership, you must first delete the SNIP address and add it again by specifying the new owner.
  • Entities that can be bound to a node group. By binding the entity to a single-member node group.
Note: Citrix recommends that you use spotted SNIP addresses. You can use striped SNIP addresses only if there is a shortage of IP addresses. The use of striped IP addresses can result in ARP flux issues.