Kubernetes/Storage
PV - Persistent Volumes
A PersistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes. It is a resource in the cluster just like a node is a cluster resource. PVs are volume plugins like Volumes, but have a lifecycle independent of any individual pod that uses the PV. This API object captures the details of the implementation of the storage, be that NFS, or a cloud-provider-specific storage system eg. AWS EBS or gcloud disks.
A PersistentVolumeClaim (PVC) is a request for storage by a user, similar to a pod. Pods consume node resources and PVCs consume PV resources. Pods can request specific levels of resources (CPU and Memory). Claims can request specific size and access modes (e.g., can be mounted once read/write or many times read-only).
A StorageClass provides a way for administrators to describe the classes of storage they offer (IOPS, performance, ssd), it's called profiles in other storage systems.