How to setup Kubernetes for a parallel job working on a collection of files
PersistentVolume cannot be bound to more than one pod at once.
Whether a PV is shared among Nodes/Pods (or not) is determined by the accessMode; it's not the case that all PVs are universally bound to just one Node/Pod
As the chart on that page shows, there are many PV technologies that tolerate ReadWriteMany, with the most famous of them being NFS