* If a node or kubelet crashes with a volume attached, the volume will remain
attached to that node. If that volume can only be attached to one node at a
time (GCE PDs attached in RW mode, for example), then the volume must be
manually detached before Kubernetes can attach it to other nodes.
  * If a volume is already attached to a node any subsequent attempts to attach it

- Kubernetes cannot distinguish between GCE Zonal PDs and Regional PDs with the same name. To workaround this issue, precreate PDs with unique names. PDs that are dynamically provisioned do not encounter this issue. ([#70716](https://github.com/kubernetes/kubernetes/pull/70716), [@msau42](https://github.com/msau42))

## Known Issues

- CSI Migration: GCE PD access mode now reflects read only status of inline volumes - this allows multi-attach for read only many PDs ([#84809](https://github.com/kubernetes/kubernetes/pull/84809), [@davidz627](https://github.com/davidz627))

* Add storage-backend configuration option to kubernetes-master charm. ([#58830](https://github.com/kubernetes/kubernetes/pull/58830), [@wwwtyro](https://github.com/wwwtyro))

* Fixed dynamic provisioning of GCE PDs to round to the next GB (base 1000) instead of GiB (base 1024). ([#56600](https://github.com/kubernetes/kubernetes/pull/56600), [@edisonxiang](https://github.com/edisonxiang))