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The recommended setting for using the NetApp ONTAP LUN fractional reserve is to set the space guarantee to "volume". This setting ensures that the required space for overwrites in the volume is reserved, preventing potential write failures when snapshot copies are created. This setup helps in maintaining the performance and reliability of the storage system by ensuring there is always enough space allocated for the LUN.

For further details, you can refer to:

NetApp Community Discussion on Fractional Reserve

NetApp Documentation on Space Management

When configuring NVMe/FC (NVMe over Fibre Channel), it is necessary to enable N_Port ID Virtualization (NPIV) on all fabric switches. NPIV allows multiple Fibre Channel initiators to share a single physical Fibre Channel port, which is crucial for NVMe/FC environments where efficient utilization of available ports is needed.

NPIV support enables the creation of virtual ports, which can significantly optimize the configuration and management of Fibre Channel fabrics, thus supporting NVMe/FC operations.

For further details, you can refer to:

NetApp Community - NVMe/FC Configuration​ (NetApp Community)​.

NetApp Documentation - NVMe Overview​ (NetApp)​.

To check the status of a SnapMirror active sync disaster recovery test on a NetApp ONTAP cluster, you would use the command snapmirror failover show. This command provides the necessary details about the failover status, helping administrators verify if the disaster recovery test is proceeding as expected. It displays the status of the failover groups and their readiness, which is essential for confirming the effectiveness of the disaster recovery setup.

For more detailed information on SnapMirror commands and their usage, refer to:

NetApp Documentation - SnapMirror Commands​ (NetApp Community)​​ (NetApp Community)​.