Free NetApp NS0-515 Exam Practice Questions & Explanations
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An engineer is documenting iSCSI network design for an ONTAP cluster. The plan specifies that each iSCSI LIF will be configured on its own dedicated Ethernet broadcast domain and that the host will use two separate subnets, with ONTAP configured for multiple sessions per host through MPIO rather than relying on LIF failover for path resiliency.
Statement: In ONTAP, iSCSI LIFs do not fail over to other nodes, so path redundancy must be provided by host-side MPIO across multiple iSCSI LIFs.
True. SAN LIFs in ONTAP, including iSCSI LIFs, do not migrate or fail over between nodes during normal operation; they are bound to their home port. Redundancy for iSCSI is achieved by creating multiple iSCSI LIFs (typically on both nodes of each HA pair and on multiple networks) and using host MPIO with ALUA to select optimized paths. This differs from NAS LIFs, which can fail over.
An ONTAP SVM has a 500 GB thin-provisioned LUN inside a 600 GB volume in an aggregate that is nearly full. The application writes heavily and the administrator wants to guarantee that the LUN never goes offline because of a lack of space in the volume, while reclaiming space automatically.
Which combination should be configured?
Volume autogrow plus snapshot autodelete provides the space-management policy that keeps the volume from running out of space, and enabling space allocation on the LUN lets ONTAP notify the host when space is critically low and lets the host issue UNMAP/TRIM to reclaim deleted blocks. Removing snapshot reserve and disabling autodelete increases risk. Full space reservation cannot be guaranteed in a nearly full aggregate and wastes capacity. Deduplication helps efficiency but does not prevent out-of-space conditions, and making a LUN read-only is not a valid capacity strategy.
An administrator configures iSCSI on a four-node ONTAP cluster. An igroup is created and a LUN is mapped, but the Linux host discovers only the paths on the node that owns the LUN's volume, and a planned volume move later breaks host connectivity.
What is the most likely cause?
Selective LUN Map advertises optimized paths on the owning node and its HA partner, but a host should still be able to reach the LUN through iSCSI LIFs on other nodes if they exist. If LIFs were only created on one node, no alternate paths exist and moving the volume breaks access. Space reservation affects capacity accounting, not path discovery. The igroup OS type affects ALUA/host settings but not LIF availability, and portsets are optional and restrict rather than create paths.
A customer is planning a new E-Series E4000 installation in a shared data center rack. During the site survey, the engineer must validate environmental and physical readiness before the shelves arrive.
Which two items are valid physical or environmental planning considerations for the installation? (Choose two.)
Environmental and physical planning covers power feeds, cooling and airflow direction (front-to-back, cold aisle to hot aisle), ambient temperature and humidity, rack space in U, shelf weight and floor loading, and rail/rack compatibility. LUN mapping, repository growth policies, and host multipath driver versions are logical configuration or host-side tasks, not physical site considerations.
An administrator is provisioning an E-Series EF300 array for a VMware datastore. The application requires maximum usable capacity from twelve 3.84 TB SSDs, and the workload is large-block sequential writes. The customer also wants to tolerate two simultaneous drive failures.
Which volume group RAID level should the administrator configure?
RAID 6 uses dual parity, so it tolerates two concurrent drive failures while consuming only two drives' worth of capacity out of twelve, giving high usable capacity for sequential write workloads. RAID 5 tolerates only a single drive failure. RAID 1 and RAID 10 mirror data and therefore lose 50 percent of raw capacity, which does not meet the maximum usable capacity requirement.