13_Skill Quiz on VM Fault Tolerance

What is the difference between high availability and VM fault tolerance in a data center setting?

• High availability automatically creates a new server instance after a failure, while fault tolerance replicates a second server instance that is always running.

• High availability and fault tolerance are the same concept.

• High availability requires manual intervention after a failure, while fault tolerance is automatic.

• High availability is only applicable to physical servers, while fault tolerance is for virtual machines.

Answer explanation

High availability automatically creates a new server instance after a failure, while fault tolerance replicates a second server instance that is always running.

What is the purpose of Admission Control in the context of high availability?

• To ensure that there is enough capacity to accommodate a failure in the cluster.

• To automatically adjust resource allocation based on demand.

• To monitor network traffic and prevent overloading the cluster.

• To restrict access to the cluster during peak usage times.

Answer explanation

To ensure that there is enough capacity to accommodate a failure in the cluster.

Why is it important to test fault tolerance configurations before deploying in a production environment?

• To increase the complexity of the system for better performance.

• To verify that the setup works as expected and to avoid surprises during actual failures.

• To confuse potential attackers by changing configurations frequently.

• To save time and skip the testing phase.

Answer explanation

To verify that the setup works as expected and to avoid surprises during actual failures.

What is the impact of setting a reservation for a virtual machine in the context of fault tolerance?

• The reservation ensures that the specified resources are always available for the VM.

• The reservation limits the resources available to the VM, causing performance issues.

• The reservation allows the VM to dynamically adjust its resource usage based on demand.

• The reservation is only applicable to physical machines, not virtual machines.

Answer explanation

The reservation ensures that the specified resources are always available for the VM.

Why did the fault tolerant VM fail to power on initially in the provided scenario?

• The network connection was unstable.

• The VM configuration was incorrect.

• Insufficient resources were available on the selected ESXi hosts.

• The VM was not compatible with the vSAN datastore.

Answer explanation

Insufficient resources were available on the selected ESXi hosts.

What action should be taken to enable Fault Tolerance logging on data center servers?

• Enable VMkernel adapters supporting FT logging

• Enable VMkernel adapters supporting HA

• Enable VMkernel adapters supporting vSAN

• Enable VMkernel adapters supporting vMotion

Answer explanation

To enable Fault Tolerance logging on data center servers, the action that should be taken is to enable VMkernel adapters supporting FT logging.

Which cluster should have the HA admission policy modified for fault tolerance setup?

• PROD-1

• DEV-1

• STAGE-1

• TEST-1

Answer explanation

The HA admission policy should be modified for fault tolerance setup in the PROD-1 cluster, as it is crucial for production environments to ensure high availability and fault tolerance.

Where should the primary server be located for optimal resources in the disaster recovery setup?

• ESXi-2

• ESXi-4

• ESXi-1

• ESXi-3

Answer explanation

The primary server should be located at ESXi-2 for optimal resources in the disaster recovery setup.

What is the recommended action to test fault tolerance in a lab environment?

• Power off the primary ESXi host

• Increase VM memory allocation

• Migrate the secondary VM

• Enable Test Failover

Answer explanation

The recommended action to test fault tolerance in a lab environment is to power off the primary ESXi host, as this will simulate a failure scenario and allow for testing the system's fault tolerance capabilities.

What should be done after enabling fault tolerance to ensure synchronization between primary and secondary VMs?

• Wait for full synchronization

• Power off the secondary ESXi host

• Test Failover

• Migrate the primary VM

Answer explanation

Wait for full synchronization