Chapter 2. Recovery for zone-aware HA applications with RWX storage
Applications that are deployed with topologyKey: topology.kubernetes.io/zone, have one or more replicas scheduled in each data zone, and are using shared storage, that is, ReadWriteMany (RWX) CephFS volume, recovers on the active zone within 30-60 seconds for new connections. The short pause is for HAProxy to refresh connections if a router pod is now offline in the failed data zone.
An example of this type of application is detailed in the Install Zone Aware Sample Application section.
When you install the sample application, power off the OpenShift Container Platform nodes (at least the nodes with OpenShift Data Foundation devices) to test the failure of a data zone in order to validate that your file-uploader application is available, and you can upload new files.
