Which statement about LUN access and mappings in ONTAP is true?

Which statement about LUN access and mappings in ONTAP is true?

• A. ONTAP automatically maps new LUNs to connected hosts.
• B. NVMe namespaces can be accessed through iSCSI and NVMe protocols.
• C. LUNs must be mapped to initiator groups to be accessible.
• D. NVMe namespaces must be mapped to an NVMe subsystem.

Answer: (C)

In ONTAP, visibility of a LUN to a host is controlled by mapping the LUN to an initiator group. An igroup holds the host initiators (such as the iSCSI IQNs or FC WWPNs) that are allowed to access that LUN. Until you add the LUN to an igroup that contains the host’s initiator, the LUN won’t be presented to the host, even if the host is connected. This makes the statement true: LUNs must be mapped to initiator groups to be accessible. The other ideas mix different concepts. LUNs aren’t automatically mapped to connected hosts; you explicitly place them in an igroup. NVMe namespaces are exposed via NVMe over Fabrics to NVMe initiators, not generally through iSCSI, so the claim about access via both protocols isn’t accurate for a single LUN. NVMe namespaces do sit within an NVMe subsystem, but that mapping context is separate from the LUN igroup mechanism used for iSCSI/FC access.

In ONTAP, visibility of a LUN to a host is controlled by mapping the LUN to an initiator group. An igroup holds the host initiators (such as the iSCSI IQNs or FC WWPNs) that are allowed to access that LUN. Until you add the LUN to an igroup that contains the host’s initiator, the LUN won’t be presented to the host, even if the host is connected. This makes the statement true: LUNs must be mapped to initiator groups to be accessible.

The other ideas mix different concepts. LUNs aren’t automatically mapped to connected hosts; you explicitly place them in an igroup. NVMe namespaces are exposed via NVMe over Fabrics to NVMe initiators, not generally through iSCSI, so the claim about access via both protocols isn’t accurate for a single LUN. NVMe namespaces do sit within an NVMe subsystem, but that mapping context is separate from the LUN igroup mechanism used for iSCSI/FC access.