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Chapter 5. Developer previews
This section describes the developer preview features introduced in Red Hat OpenShift Data Foundation 4.21.
Developer preview feature is subject to Developer preview support limitations. Developer preview releases are not intended to be run in production environments. The clusters deployed with developer preview features are considered to be development clusters and are not supported through the Red Hat Customer Portal case management system. If you need assistance with developer preview features, reach out to the ocs-devpreview@redhat.com mailing list and a member of the Red Hat Development Team will assist you as quickly as possible based on availability and work schedules.
5.1. Two Nodes Fencing (TNF) Support
Adds initial support for Two Nodes Fencing (TNF), enabling deployment of highly available two‑node OpenShift clusters. This enhancement removes a key adoption barrier by providing a storage path that aligns with OpenShift’s upcoming two‑node capabilities, helping customers benefit from an integrated Red Hat compute‑and‑storage solution.
For more information, see Deploying OpenShift Data Foundation on a Two‑Node OpenShift Cluster with Fencing and DRBD.
This update introduces automatic storage‑level fencing for nodes marked with the Kubernetes out‑of‑service taint during non‑graceful shutdowns. When such a taint is applied, OpenShift Data Foundation ensures volumes attached through Ceph‑CSI are safely fenced from the unreachable node, allowing pods to be rescheduled on healthy nodes without risk of data corruption. This improves high availability and significantly reduces recovery time during unexpected node or zone outages.
For more information, see Configuring Non-Graceful Node Shutdown Handling in OpenShift Data Foundation.
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