kubernetes persistent volume accessmode

Question

It seems that Kubernetes supports 3 kinds of access mode for persistent volume: ReadWriteOnce, ReadOnlyMany, ReadWriteMany. I\'m reall

Answer 1

If a pod mounts a volume with ReadWriteOnce access mode, no other pod can mount it. In GCE (Google Compute Engine) the only allowed modes are ReadWriteOnce and ReadOnlyMany. So either one pod mounts the volume ReadWrite, or one or more pods mount the volume ReadOnlyMany.

The scheduler (code here) will not allow a pod to schedule if it uses a GCE volume that has already been mounted read-write.

(Documentation reference for those who didn't understand the question: persistent volume access modes)