Manage AOS load balancing

You can load balance across multiple computers that are running Microsoft Dynamics AX Application Object Server (AOS) instances.

Set up load balancing

The options for a load balancing topology include:

• Add AOS instances to a cluster and run the cluster without a load balancer.
  If you set up a cluster without a load balancer, you can use client configurations to set clients to connect to one or more AOS instances that have load balancing enabled. If an administrator needs to remove a computer from the cluster, and one or more client configuration is pointing to it, the client configuration must be updated. No additional hardware is required for this topology.
• Add AOS instances to a cluster and configure one or more AOS instances to be a load balancer.
  If you set up a cluster with a load balancer, you must use client configurations to set clients to connect to the AOS that has been set as the load balancer. You can then add and remove instances from the cluster without needing to update client configurations. Additional hardware may be required to set up a computer as a load balancer.

Add AOS instances to a cluster

1. Open the Server Configuration utility (Start > Control Panel > Administrative Tools > Microsoft Dynamics AX Server Configuration Utility).
2. Verify that the currently selected (AOS) instance and configuration are the ones that you want to modify.
3. Select Make this AOS instance part of the load balancing cluster.
4. Set a value for the maximum number of client sessions that the AOS instance will accept.

Set up an AOS to be a load balancer

1. Open the Server Configuration utility (Start > Control Panel > Administrative Tools > Microsoft Dynamics AX Server Configuration Utility).
2. Verify that the currently selected (AOS) instance and configuration are the ones that you want to modify.
3. Select Use this AOS instance for load balancing only (accept no client connections).

Manage members of a cluster

As part of maintenance, you may need to temporarily remove and add AOS instances from a cluster. To add and remove members of a cluster, you control whether an instance accepts or rejects new client connections.

Set an AOS instance to reject new clients

1. Open a Microsoft Dynamics AX client.
2. Open the Online users form. (Administration >  ).
3. On the Server Instances tab, select the AOS instance.
4. When the number of clients connected to the AOS reaches 0, it is safe to perform maintenance.

Add an AOS instance to a cluster

1. Open the Online users form. (Administration >  ).
2. On the Server Instances tab, select the AOS instance.