3.4. Planning your Cluster

When it comes to configuring openMosix Clusters with a pool of servers and a set of (personal) workstations, you have different options that will have their advantages and disadvantages.

• In a Single-pool configuration all the servers and workstations are used as a single cluster: each machine is a part of the cluster and can migrate processes to each other existing node. This of course makes your workstation a part of the pool.

• In an environment that is called a Server-pool, servers are a part of the cluster while workstations aren't part of it, they don't even have openMosix kernel. If you want to run applications on the cluster you will need to specifically log on to these servers. However your workstation will also stay clean and no remote processes will migrate to it.

• A third alternative is called an Adaptive-pool configuration: here servers are shared while workstations join or leave the cluster. Imagine your workstation being used during daytime by yourself but, as soon as you log out in the evening, a script tells the workstation to join the cluster and start crunching numbers. This way your machine is being used while you don't need it. If you need the resources of the machine again just run the openmosix stop script and your processes will stay away from the cluster and vice-versa.

  Practically this means that you will change the role of your machine by using mosctl.