OpenShift uses the Persistent Volume (PV) concept to allow administrators to provide persistent storage for a cluster and then let developers request storage resources via Persistent Volume Claims (PVC). Thus, end users can request storage without having deep knowledge of the underlying storage infrastructure. At the same time, administrators can configure the underlying storage infrastructure and make it available to end users via the PV concept.
PV resources are shared across the OpenShift cluster since any of them can (if it is allowed) potentially be used by any users/projects. On the other hand, PVC resources are specific to a project (namespace) and they are usually created and used by end users, such as developers. Once PVC resources are created, OpenShift tries to find a suitable PV resource that matches specific criteria, like...
