Server Group Function

You can register multiple virtual servers together as one server group, and specify how the server group behaves as a policy.

Specify the behavior of the server group as an entity by specifying how the collection of servers is run on the physical host.

  • Affinity

    The virtual servers that are registered in the server group for which the Affinity policy is specified are started on the same physical host when possible.

    This helps communication between virtual servers within the same server group become faster compared to when Anti-Affinity is specified.

  • Anti-Affinity

    The virtual servers registered in the server group for which the Anti-Affinity policy is specified are started on different physical hosts when possible.

    In this case, even if some physical hosts go down, virtual servers running on the other physical hosts are not affected. Therefore, in a scale out configuration, your business keeps on running.

Tip: Specify the server group when you create the virtual server.

Figure: Operation of the Server Group Function



Note:

Operation of the server group function is not guaranteed. Depending on the usage of IaaS, you may experience the following:

  • Even when you specify Affinity, some virtual servers may start on different physical hosts.
  • Even when you specify Anti-Affinity, some virtual servers may start on the same physical host.