2 Replies Latest reply on Jul 7, 2014 9:29 AM by Wolf-Dieter Fink

    What is the difference between a SeverGroup and a Cluster?

    Srikanth M Newbie

      Hi All,

       

      Can anyone please explain the difference between a server-group and a cluster?

       

      Thank you.

        • 1. Re: What is the difference between a SeverGroup and a Cluster?
          Adil Arif Newbie

          A Server Group is a grouping of one or more server instances that are subsequently treated as one when pertaining to configurations and deployments.

           

          A cluster is a grouping of two or more server instances that have its deployments load balanced and/or have high availability.

           

          The difference between the two is that clustering does not necessarily depend on the server groups. For High Availability, it depends on who is listening on a particular multicast address. This means that one can potentially have multiple Server Groups that listen on a particular multicast port all be clustered together. For Load Balancing, it depends on either how your hardware load balancer or Apache and mod_cluster instances are configured.

           

          Additional Readings

          Clustering

          Server Groups

          Scalable Clustering

          • 2. Re: What is the difference between a SeverGroup and a Cluster?
            Wolf-Dieter Fink Master

            Additional to you

            a server-group is a domain administration thing. I would recommend to use a have one server-group for clustered servers unless you have a good reason (i.e. slightly different config or deployment).

            Also it makes configuration complicated if you build such complex scenarios