Now, besides the regular high availability feature that requires the use of two nodes, NetScaler also has some other high availability features such as clustering.
We will not dive deep into clustering, but we will be going through a basic overview. If you wish to read more about clustering, you should read the clustering guide from Citrix, which can be found at http://bit.ly/1NLPPIA.
Regular high availability operates with a two-node instance, where one is active and the other is passive. With clustering, we can scale from 2 up to 32 nodes, which are operating in an Active/Active state. This allows for a large amount of traffic throughput. In order to use this, we require an additional license. Also, there are some other requirements, as follows:
To be on the same subnet
To be of the same hardware type (for example, physical appliances)
To be of the same platform type
To have the same licenses (Standard, Enterprise, and Platinum)
To be of the same software version and build
To have their...