Applies to ONTAP Veeam Backup & Replication Resilient File System (ReFS) Answer When an application accesses ONTAP using NAS protocols, the application is not able to format the volume. This is becaus...Applies to ONTAP Veeam Backup & Replication Resilient File System (ReFS) Answer When an application accesses ONTAP using NAS protocols, the application is not able to format the volume. This is because the file system is managed by the NAS server (ONTAP), so the application is not able to format the volume space. ONTAP and other NetApp storage systems (E-Series) do support the scenario when the client OS mounts a LUN using iSCSI or FC, rather than NAS protocols. Additional Information