Managing Cluster Mode for app-server

On the Zowe servers, the component "app-server" has an environment variable "ZLUX_NO_CLUSTER" which controls whether or not it uses cluster mode. Cluster mode is enabled by default. However, you might need to disable cluster mode under certain circumstances. When cluster mode is disabled, make sure you are aware of the potential drawbacks and benefit.

When you disable cluster mode, you will lose the following benefits:

1. Performance under high user Count: This is due to the absence of redundant workers, which can impact the system's efficiency when dealing with a large number of users.

2. Reduced downtime during unexpected exceptions: The low-downtime characteristic, where only one request is interrupted compared to around 15 seconds of downtime, is compromised.

To turn the cluster mode on

• Do NOT include the zowe.environments.ZLUX_NO_CLUSTER in the zowe.yaml file.

To turn the cluster mode off

• Include zowe.environments.ZLUX_NO_CLUSTER=1 in the zowe.yaml file.