Learn Editor: Update troubleshoot-container-storage.md

Author: lorbichara

articles/storage/container-storage/troubleshoot-container-storage.md

@@ -64,6 +64,13 @@ If you created an Elastic SAN storage pool, you might not be able to delete the
 
 To resolve this, sign in to the [Azure portal](https://portal.azure.com?azure-portal=true) and select **Resource groups**. Locate the resource group that AKS created (the resource group name starts with **MC_**). Select the SAN resource object within that resource group. Manually remove all volumes and volume groups. Then retry deleting the resource group that includes your AKS cluster.
 
+## Troubleshoot persistent volume issues
+
+### Can't create persistent volumes from ephemeral disk storage pools
+Because ephemeral disks (local NVMe and Temp SSD) are ephemeral and not durable, we enforce the use of [Kubernetes Generic Ephemeral Volumes](https://kubernetes.io/docs/concepts/storage/ephemeral-volumes/#generic-ephemeral-volumes). If you try to create a persistent volume claim using an ephemeral disk pool, you'll see the following error: *Error from server (Forbidden): error when creating "eph-pvc.yaml": admission webhook "pvc.acstor.azure.com" denied the request: only generic ephemeral volumes are allowed in unreplicated ephemeralDisk storage pools*.
+
+If you need a persistent volume, where the volume has a lifecycle independent of any individual pod that's using the volume, Azure Container Storage supports replication for NVMe. You can create a storage pool with replication and create persistent volumes from there. See [Create storage pool with volume replication](use-container-storage-with-local-disk.md#optional-create-storage-pool-with-volume-replication-nvme-only) for guidance. Note that because ephemeral disk storage pools consume all the available NVMe disks, you must delete any existing ephemeral disk storage pools before creating a new storage pool with replication enabled. If you don't need persistence, you can create a generic ephemeral volume.
+
 ## See also
 
 - [Azure Container Storage FAQ](container-storage-faq.md)