Qlikview clustering is a technique to balance the load(access) of documents on server.
for qlikview server clustering, see the qlikview server reference manual, page 103.
Clustering is when you install QlikView server or Publisher on two or more servers. When clustering it allows you to share resources between the different services for example load balancing of a QlikView document, the document is loaded on two or more servers so that users get the best possible performance. It also ensures continuity, if one server goes down then users will be directed to another server. When clustering the publisher, this will allow you to handle reloads, reduce and distribution on different servers.
To be able to cluster you need to have a cluster license, that is on the Lef-file you need to have "Cluster nodes" at a value of two or more and in the publisher Lef you need to have "Number of XS" at a value of two or more.
All servers can (and should) be managed from a single QMC
Hi, you can actually can create a cluster of any service of QlikView (Except for QMC that would cause trouble), so you can have redundancy in publisher nodes, server nodes, webserver, even cluster for Directory Service. Therefore, you can build an installation as easy or as complex depending on your requirements,
This is basically what I said, you can share resources/services between two or more servers i.e. cluster the services . You can't on the other hand cluster the webservice, you can add webservers but these are not clustered in the same way as the other services. As Bill mentioned it is the same license but it has to be a cluster license, the same goes if you want to cluster the publisher.
As mentioned, when the server license is entered you should se the following line in the license file.
And the following in the publisher license file.
The 2 indicates the number of cluster nodes available in the license.