Requirements for enabling stretch cluster

  • Ensure that you have addressed OpenShift Container Platform requirements for deployments that are spanning across multiple sites. For more information, see knowledgebase article on cluster deployments spanning multiple sites.

  • Ensure that you have at least three OpenShift Container Platform master nodes in three different zones. One master node in each of the three zones.

  • Ensure that you have at least four OpenShift Container Platform worker nodes that are evenly distributed across the two Data Zones.

  • For stretch cluster on bare metal, use the SSD drive as the root drive for OpenShift Container Platform master nodes.

  • Ensure that each node is pre-labeled with its zone label. For more information, see the Applying topology zone labels to OpenShift Container Platform nodes section.

  • The stretch cluster solution is designed for deployments where latencies do not exceed 10 ms between zones. Contact IBM Support if you are planning to deploy with higher latencies.
    Note: Flexible scaling and Arbiter both cannot be enabled at the same time as they have conflicting scaling logic. With Flexible scaling, you can add one node at a time to your Fusion Data Foundation cluster. Whereas in an Arbiter cluster, you need to add at least one node in each of the two data zones.