Click Devices > Access Gateways > New Cluster.
Specify the following details:
Cluster Name: Specify a display name for the cluster.
Type: Select the type of cluster you want to create: Gateway Appliance or Gateway Service.
Primary Cluster Server: Select the server that is to be the primary server in the cluster. This field is empty until you have selected one or more servers to be members of the cluster.
In the Server Name list, select the servers that you want to be members of the cluster.
You can create a cluster of one and add additional servers later.You cannot create a cluster that contains Access Gateway Appliances and Access Gateway Services. The cluster can contain only one type of Access Gateway.
Each server you add to the cluster adds about 30 seconds to the time it takes to configure the cluster because certificates must be synchronized and configuration options must be sent to that server. If you create a very large cluster of twenty servers, it can take up to ten minutes to configure and create the cluster.
Select the server you want to be the Primary Cluster Server.
Click OK.
After the cluster has been created, each server in the cluster needs be restarted. On the Access Gateways page, click Update All by the name of the cluster.
For information about additional tasks, see Managing Access Gateway Cluster Configuration.