Nutanix Nutanix Certified Advanced Professional (NCAP) NCM-5.15 Questions & Answers

• Question 41:

  An administrator needs to migrate workloads from a Nutanix cluster running VMware ESXi to Nutanix AHV. The migration process needs to be completed in multiple VM groups and support roll back in case any problems are found during user acceptance testing.

  Which action should the administrator perform?

  A. Use Cross Hypervisor DR to replicate VMs from ESXi to AHV

  B. Use VMware Converter

  C. Use Nutanix one-click cluster conversion from ESXi to AHV

  D. Use storage live migration

  Correct Answer: C

• Question 42:

  An administrator receives an alert in Prism indicating that interface eth2, on an AHV host is receiving many CRC errors. After togging into the problematic host, the following command is run to show the indicated output:

  

  What is causing this issue?

  A. Incorrect link speeds on the switch

  B. The interface is incorrectly configured with Jumbo Frames

  C. A misconfigured bond

  D. A physical layer network problem

  Correct Answer: B

  rx_crc_errors are caused either by faults is layer 1 (in the past, we have seen failed twinax cables and incorrect types of fibre being used), or issues with jumbo frames on the network. In an environment with 10 Gig switches that use cut-

  through forwarding (Cisco Nexus, Arista, Cisco devices using IOS default to Store and Forward switching), any packets that come into the switch will get forwarded out the destination interface once the switch has read the destination MAC

  address. If that packet has an MTU over what is configured on the interface, it will cut off the packet at the designated MTU, causing the server to receive a malformed packet, which will throw a CRC error.

  If you have a layer 1 issue, you will see rx_crc_errors, not on all but one or two nodes.

• Question 43:

  An administrator receives reports that VDI desktop performance in an 8-node Nutanix VDI environment is poor. Opening applications takes between 1 and 2 minutes. When investigating the issue, the following conditions are found:

  Cluster memory utilization: 80%

  Cluster SSD utilization: 70%

  Average VM CPU Wait Time: 11%

  CVM CPU utilization: 75%

  Which action should be taken to improve VDI performance?

  A. Increase the amount of SSD storage in the cluster.

  B. Add memory to the nodes in the cluster.

  C. Add CPU resources to the cluster.

  D. Increase the number of vCPU cores allocated to the CVM.

  Correct Answer: C

• Question 44:

  A customer wants to run SAP HANA on a Nutanix cluster with the following characteristics: AHV nodes SAP HANA version 2 Production database files

  Which configuration should be recommended to the customer?

  A. Start with a cluster containing three or more nodes

  B. Enable only compression for the container that contains the Production database

  C. Do not enable compression, deduplication, or erasure coding on the storage container

  D. Plate the SAP HANA Database on the same socket as CVM

  Correct Answer: C

  Do not configure storage-saving functionalities such as compression, deduplication, or erasure coding (EC-X) on a storage container that holds production database files. Because of the way the SAP HANA Persistence Engine stores data,

  these features deliver no benefits. Nutanix SAP Engineering has tested compression with SAP HANA workloads; the tests indicate no noticeable performance impact but also show no reduction in the space the SAP HANA workload

  consumes.

  Reference:

  https://www.nutanix.com/go/sap-hana-on-nutanix-bpg

• Question 45:

  An administrator is performing a set of routine checks and notes that Prism Central is running with 4 vCPUs and 21 GB RAM. The organizations environment is based on two Nutanix clusters with 170 VMs plus a Legacy vSphere infrastructure. No manual changes have been done on Prism Central VM.

  Which configuration justifies the current Prism Central configuration?

  A. Nutanix Move is running on Prism Central to import VMs from the Legacy Cluster.

  B. Prism Central was installed for Large Deployment environments.

  C. Prism Central is running on the legacy cluster and requires more RAM.

  D. Nutanix Leap and Nutanix Flow have been enabled on Prism Central

  Correct Answer: D

• Question 46:

  Refer to the exhibits.

  An administrator has reported that a new VM is not performing well.

  

  After analyzing the information presented in the exhibits, which option shows the best conclusion regarding this workload?

  A. VM is CPU constrained since the hypervisor cannot provide the required resources.

  B. VM is CPU constrained because more CPU needs to be added to the VM.

  C. VM is Storage constrained, because the workload is waiting for storage access.

  D. VM is not CPU constrained, because the VM is not running, a multithreaded application.

  Correct Answer: C

• Question 47:

  A three-node cluster has a Nutanix Files instance with three FSVMs. What happens after a node failure?

  A. The affected FSVM will get live-migrated to another node.

  B. The affected FSVM will not be restarted on another node due to its agent VM setting.

  C. The affected FSVM will not be restarted on another node due to its VM-to-VM anti-affinity settings.

  D. The affected FSVM will be restarted on another node.

  Correct Answer: D

  Reference: https://portal.nutanix.com/page/documents/details?targetId=Files-v3_6:fil-files-high-availability-c.html

• Question 48:

  An alert about RX errors on eth2 on a node is reported in the cluster. The administrator logs in to the CVM in question, checks the ping_* files in the data/logs/syststats folder, and notices intermittent ping loss. The node in question has the following network configuration:

  

  Which action should be used to troubleshoot without disrupting the VMs running on this node?

  A. Replace the cable from eth2 to the switch

  B. Remove eth3 from br0-up and monitor for new alerts

  C. Check the port on the switch side for any errors

  D. Enable balance-s1b on br0-up and monitor if a problem persists

  Correct Answer: C

• Question 49:

  An administrator is deploying several new application VMs to a Nutanix cluster. The application is very transactional with a 28/72 random, read/write ratio. What should the administrator do?

  A. Add a minimum of four SSDs to each node to ensure all writes go to the SSDs.

  B. Add a minimum of four virtual disks to each VM, and aggregate them on guest OS level.

  C. Add one large SSD to each node and enable Flash Mode for the VMs.

  D. Add one large virtual disk to each VM and use it for all application data.

  Correct Answer: B

  >Multiple vdisks should be attached (they can be unified with LVM for example) to get more performance from VM's, as Nutanix OS limiting oplog size per vdisk (to avoid "noisy neighbor" problem).

  Reference: https://next.nutanix.com/server-virtualization-27/iops-latency-issue-1168

• Question 50:

  An administrator needs to forecast infrastructure requirements for a new program and its associated applications. Prior to the projected start of the new program, all existing applications will be decommissioned. How should the administrator perform this task?

  A. Check the Disregard Existing Workloads radio button in the Runway scenario.

  B. Check the Disregard Existing Nodes radio button in the Runway scenario.

  C. Add up the recovered workloads and manually remove from the Runway configuration.

  D. Power down the workloads during a maintenance window and run the Capacity Runway.

  Correct Answer: A