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2V0-620 · Question #2

An administrator wants to add a web server to an existing multi-tier application consisting of three virtual machines: A web server A database server An application server The web server should be add

The correct answer is A. Create a virtual machine alarm with an action to run a script that starts a new instance of the web. A virtual machine alarm monitoring VM-level CPU and memory metrics with a script action is the correct way to trigger automated scaling based on per-VM utilization thresholds.

Section 5 – Administer and Maintain vSphere

Question

An administrator wants to add a web server to an existing multi-tier application consisting of three virtual machines:

A web server A database server An application server The web server should be added to the application when the primary web server reaches:

70% vCPU utilization 55% active memory Which option will achieve this result?

Options

  • ACreate a virtual machine alarm with an action to run a script that starts a new instance of the web
  • BCreate a host cpu and memory alarm with an action to run a script that starts a new instance of
  • CConfigure HA application monitoring for the web server and set it to trigger deployment of a new
  • DConfigure Fault Tolerance on the virtual machine and leave the secondary machine disabled until

How the community answered

(64 responses)
  • A
    72% (46)
  • B
    16% (10)
  • C
    8% (5)
  • D
    5% (3)

Why each option

A virtual machine alarm monitoring VM-level CPU and memory metrics with a script action is the correct way to trigger automated scaling based on per-VM utilization thresholds.

ACreate a virtual machine alarm with an action to run a script that starts a new instance of the webCorrect

A virtual machine alarm directly monitors the specific VM's vCPU utilization and active memory - the metrics specified in the requirement (70% vCPU, 55% active memory) - and the alarm action can execute a script that provisions and powers on a new web server instance, matching the stated thresholds precisely.

BCreate a host cpu and memory alarm with an action to run a script that starts a new instance of

A host-level CPU and memory alarm monitors aggregate host resource usage, not the individual virtual machine's utilization, so it cannot accurately detect when a single web server VM crosses the specified thresholds.

CConfigure HA application monitoring for the web server and set it to trigger deployment of a new

HA application monitoring is designed to detect application heartbeat failures and restart VMs, not to trigger scale-out deployments based on utilization percentage thresholds.

DConfigure Fault Tolerance on the virtual machine and leave the secondary machine disabled until

Fault Tolerance creates a continuously synchronized secondary VM that takes over instantly on primary failure - it does not add capacity based on utilization thresholds and cannot be left disabled as a standby scaling resource.

Concept tested: VM alarm actions for threshold-based automated scaling

Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.monitoring.doc/GUID-9272E3B2-6A7F-427B-994C-B15FF8CADC25.html

Topics

#VM alarms#alarm actions#CPU utilization#auto-scaling

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