NS0-520 Sample Questions & Answers

Storage efficiency features like deduplication and compression are enabled at the FlexVol volume level, not on individual LUNs. To achieve the goal, the administrator must first ensure deduplication is enabled on the volume that will contain the LUN. Then, the LUN should be created with space reservation disabled (-space-reserve disabled), which is how thin provisioning is implemented for a LUN in ONTAP.

The lun show command with the -fields node parameter is the most direct way to identify which node currently owns the volume containing the LUN. This information is crucial for determining the optimal I/O paths. If the host is primarily using LIFs on a different node, it indicates a pathing issue that would cause higher latency due to cluster interconnect traffic.

Since the LIF is reachable via ping (ICMP), basic network connectivity is confirmed. However, the lack of response to iSCSI discovery requests (typically on TCP port 3260) points to a higher-level block. In ONTAP, each LIF has an associated firewall policy. If this policy does not explicitly allow the 'iscsi' service, the node will drop the incoming discovery packets, leading to this exact symptom.

The cutover for FLI requires a brief outage. The correct procedure involves shutting down the application/host, removing the zoning for the old storage array paths, creating new zones for the ONTAP paths, and then bringing the host back up. Once online, a rescan of the storage bus will discover the LUNs presented from the ONTAP system, completing the migration.

A portset is a mechanism used to control which FCP target LIFs are visible to a specific initiator group (igroup). By binding an igroup to a portset, you limit the paths that the initiators in that group can use to access LUNs. This is often used to enforce specific pathing policies or to isolate traffic in multi-tenant environments.

NetApp best practice for iSCSI is to configure a minimum of two data LIFs per node for each SVM providing SAN access. This configuration provides path redundancy across the node's network ports and allows for better load balancing by the host's multipathing software. For a 2-node cluster, this results in a total of four LIFs for the SVM.

NPIV is a fundamental requirement for both FCP and NVMe/FC in a virtualized storage environment like ONTAP. It allows a single physical Fibre Channel port (N_Port) to register multiple unique World Wide Port Names (WWPNs) with the fabric. ONTAP uses this feature to assign unique WWPNs to each FCP and NVMe/FC LIF, which is essential for proper zoning and host recognition.

The first step is to create the LUN itself within an existing or new volume on the SVM.

An initiator group (igroup) must be created to represent the host. The World Wide Port Names (WWPNs) of the host's HBAs are added to this igroup.

Finally, a LUN map is created. This map links the specific LUN to the igroup, which makes the LUN visible to the host initiators defined in that igroup.

This design meets all requirements. Using NVMe/FC provides the lowest possible latency for the critical databases on dedicated infrastructure. A separate SVM for iSCSI leverages the existing 10GbE network for the VMs, minimizing cost. The use of two SVMs provides logical isolation between the workloads while still allowing them to be managed from a single ONTAP cluster, fulfilling all constraints.

The NetApp Hardware Universe (HWU) is the definitive tool for obtaining detailed hardware specifications, including environmental data. It allows users to build a virtual configuration with specific controllers, shelves, and adapters, and it will generate a report with the total power consumption (Watts), heat dissipation (BTU/hr), and weight for the entire configuration.