Given a Scenario, Optimize the Performance of a Virtual Machine Within a VCF Workload Domain VCAP-VCF-SUPPORT Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A VCF administrator notices that a database VM in a Workload Domain is experiencing high CPU ready time during peak hours. The VM has 8 vCPUs and is the only VM on its host. The host has 2 physical CPUs with 12 cores each. The VM's workload is mostly single-threaded with occasional bursts of multi-threaded activity. Which configuration change is most likely to improve CPU performance?

   • AChange the NUMA topology so the VM's vCPUs are placed on a single physical CPU socket.
   • BIncrease the CPU reservation to guarantee the VM gets more CPU time.
   • CReduce the number of vCPUs to 2 and enable CPU hot add.
   • DSet a CPU limit equal to the VM's current usage to prevent it from consuming more CPU.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A VCF administrator is implementing resource management best practices for a cluster of VMs. The cluster has a mix of production and development VMs. The production VMs are critical and need consistent performance. The development VMs are less critical and can tolerate performance degradation. The administrator wants to ensure production VMs get priority for CPU and memory resources. What should the administrator do?

   • AEnable DRS with aggressive migration threshold to balance load.
   • BSet CPU and memory limits for production VMs to cap their usage.
   • CSet CPU and memory reservations for development VMs to guarantee their resources.
   • DSet high CPU and memory shares for production VMs and low shares for development VMs.
   Reveal Solution Discussion Select an answer first
4. 13expert · medium

   A VCF administrator is troubleshooting a VM that is experiencing performance issues. The VM is running a critical application. The administrator uses esxtop and sees the following metrics for the VM: %RDY is 15%, MEMACT is 20 GB, SWCUR is 0, and the VM's disk latency is 50 ms. The host has plenty of CPU and memory capacity. The administrator suspects the issue is storage-related. Which additional metric should the administrator examine to confirm the storage bottleneck?

   • ANETWORK packets dropped.
   • BMemory MEMACT and SWCUR.
   • CDAVG and KAVG for the VM's virtual disk.
   • DCPU %USR and %SYS.
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A VCF administrator is optimizing network performance for a VM that runs a high-throughput application. The VM is configured with a VMXNET3 adapter. The host has a 10 GbE physical NIC. The VM is experiencing high network latency. The administrator wants to reduce latency for the VM's traffic. Which configuration change is most likely to help?

   • AEnable traffic shaping on the virtual switch to prioritize the VM's traffic.
   • BIncrease the number of RX/TX queues on the VM's network adapter.
   • CEnable SR-IOV on the VM's network adapter.
   • DChange the VM's network adapter to e1000e.
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A VCF administrator is troubleshooting storage performance for a VM that runs a file server. The VM's virtual disk is on a VMFS datastore. The datastore is experiencing high latency. The administrator notices that other VMs on the same datastore are also experiencing latency. The administrator wants to ensure the file server VM gets priority for storage I/O. What should the administrator do?

   • AMove the file server VM to a different datastore.
   • BIncrease the file server VM's disk size.
   • CSet a storage I/O limit on the other VMs to reduce their I/O.
   • DEnable Storage I/O Control (SIOC) on the datastore and set a high share value for the file server VM.
   Reveal Solution Discussion Select an answer first