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To automate the task of growing vDisks on multiple classes of VMs using Nutanix Playbooks, the administrator should follow these steps:

Create a custom Alert Policy:

Create an alert policy that triggers when the server's disk usage reaches 85% or above. This ensures the playbook is triggered based on the specified threshold.

Select Alert as the trigger:

Set the alert created in step 1 as the trigger for the playbook. This ties the alert condition to the execution of the playbook.

Select Email Action with custom message:

Add an action to send an email notification. This email should be sent prior to any work being started, to inform relevant stakeholders about the impending vDisk growth operation.

Add Action to Grow vDisks:

Add the action to grow the vDisks on the VMs. This step should include the necessary script or task that performs the vDisk growth operation on the specified VMs.

Based on the requirements and steps, the playbook should be structured as follows:

Step 1: Create a custom Alert Policy

Define the alert policy with the condition that disk usage on the VMs reaches 85% or higher.

Step 2: Select Alert as the trigger

Use the alert policy created in Step 1 as the trigger for the playbook.

Step 3: Select Email Action with custom message

Add an email action to notify relevant stakeholders before the vDisk growth task is initiated.

Step 4: Add Action to Grow vDisks

Include the necessary action to grow the vDisks on the VMs as required.

This structure ensures that the playbook is dynamically responsive to changes in server usage, sends notifications prior to execution, and performs the required vDisk growth operation automatically.

To ensure the VMs are properly remediated, the Playbook actions should be added in the following order: Take a VM Snapshot, VM add Memory, Resolve Alert. This is because Memory Hot Add allows the administrator to increase the memory allocation of a running VM without powering it off. Taking a VM snapshot before adding memory provides a backup point in case of any issues. Resolving the alert after adding memory clears the notification and updates the status of the VM. Powering off the VM is not necessary and may cause downtime or disruption to the applications running on the VM. References: Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, page 11; Nutanix Calm SaaS User Guide, section 4.2.3.

 According to the Nutanix Multicloud Automation Administration (NMCAA) course1, you can create and configure multi-VM blueprints for the Nutanix, AWS, VMware, GCP, and Azure providers. However, according to the Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide2, the exam objectives only cover Nutanix and AWS as the providers for multi-VM blueprints. Therefore, the correct answer is C. Nutanix and E. Amazon AWS. References: Nutanix Multicloud Automation Administration (NMCAA) course and Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide

To enable Calm, the administrator needs to log on to Prism Central with a local ADMIN account and click Services -> Calm -> Enable. This will install the Calm service on Prism Central and allow the administrator to access the Calm UI and features. The other options are incorrect because they either refer to Prism Element, which is not the correct platform for Calm, or they involve unnecessary or incorrect steps. References: [Enabling and Accessing Calm | Nutanix Community] (https://next.nutanix.com/installation-configuration-23/enabling-and-accessing-calm-40191); [Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide] (https://www.nutanix.com/content/dam/nutanix/resources/support/ds-ncp-mca.pdf), section 2.1.