Log on to the NODE01 machine.

Launch the Disk Management console.

Right-click on the shared disk and select Online to bring it online.

Right-click again on the disk and start the New Simple Volume Wizard.

On the first dialog, click Next.

Specify the Simple Volume Size in MB. Click Next.

For easier access, assign a drive letter to the disk; for example, P and click Next.

Enter a volume label in the Volume Label text box; for example, Druva and click Next.

Click Finish and wait for a few seconds for the format operation to complete. Your disk is formatted with the NTFS file system.

Launch the Failover Cluster Manager console.

On the left pane, expand Storage and select Disks.
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Click Add Disk in the Actions pane on the right-hand side. You can see your newly added shared disk in the pop-up window. Select the disk and click OK.
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In the Disks section, right-click on the disk and select Properties. Rename the disk as PhoenixDisk (or any name that you may prefer). Click Apply and OK.
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Right-click on the disk and select Add to Cluster Shared Volumes. The drive is added to your node. Now, the drive is added as a CSVFS disk.
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Before you can assign a letter to the disk, the Owner Node of the disk must be the same as the node you have logged on to (in this case NODE01). To ensure that NODE01 is the Owner Node:

To assign a letter to this disk, launch the Disk Management console.

On the Disk Management console, right-click on the shared disk and select change drive letter and paths.

Download the Enterprise Workloads agent for Druva Cloud on all the nodes in the cluster.

Log on to NODE01. For the sake of simplicity, assume that drive P:is the shared drive that you have created as clustered shared volume across all nodes on which you want to install the agent.

Start the installation for Druva-EnterpriseWorkloadsSVC using the downloaded Installer.

Accept the license and click Next.

In the Install Location box, enter the directory of the shared storage; for example, if P:drive is your shared directory, replace C with P and click Install. The installer copies all the necessary files on the given shared directory P:.
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After the installation completes, click Finish. The Enterprise Workloads agent is now installed on the P:drive.

Stop the Druva-EnterpriseWorkloads Service (Druva-EnterpriseWorkloadsSVC)

Go to the C:\ProgramData\Druva directory. Move the EnterpriseWorkloads folder to the shared directory P:; for example, move it to P:\SharedProgramData\.

📝 Note
​ This step of moving the Druva folder is required only at the first login on the first node.

To make Druva access its local data and configuration files, create a junction point that points to the newly created Druva folder location on the shared drive P\SharedProgramData\EnterpriseWorkloads. This step must be performed on all nodes. Launch the Command Prompt and create a junction point using the following command:
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Start the Druva-EnterpriseWorkloads Service (Druva-EnterpriseWorkloadsSVC).
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Register the NODE01 by running the following command:

EnterpriseWorkloadsAgent.exe mssql activate -t <token> --sql-fci-cluster -k
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​Note: If you are re-registering your node, see Re-register.
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Once the registration is done, stop the Druva-EnterpriseWorkloads Service (Druva-EnterpriseWorkloadsSVC) on node 1.

Perform the following:

Open Failover Cluster Manager and select Roles in the left pane .

Right-click on the SQL Server role and click Add Resource > Generic Service. The New Resource Wizard pop-up window appears.
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Select Enterprise Workloads Agent Client Service from the list of services displayed and click Next.

The Confirmation section on the pop-up window appears. Verify the details and click Next to continue.

The Configure Generic Service section on the pop-up window appears. Verify the details and click Next to continue.

In the Summary section, to view the report created by the wizard, click View Report. Click Finish.

Note: Remove the existing Hybrid Workloads client service. If the existing service is not removed, it may impact failover.

Open the Failover Cluster Manager and select Roles in the left pane .

Select the Resources for the selected FCI Role

Under Resources, there will be Druva-Enterprise Workload Service listed.
Right Click on Enterprise Workload Agent Service -> Properties -> Dependencies

Click Insert and select shared Disks as a new dependency.
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Note:
CSV’s can’t be added as a dependency to the cluster roles. This is valid for shared disks only.
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Also add the FCI network I/P and SQLServer resource name from the dependencies list. Click Apply -> Ok

Navigate to the Registered Servers page in your management console.

Find and select the server (your SQL FCI) that you need to re-register.

From the actions menu for that server, click the Re-register option.

The console will display a new activation token. Copy this token; you will need it for the next step.

Log in to the cluster node (e.g., node 1) as an administrator.

Open Command Prompt (cmd.exe) or PowerShell as an Administrator.

Run the following command. Replace <token> with the new activation token you copied in the previous step.

Wait for the command to complete. This will finalize the re-registration process.

On node 1, open Command Prompt (cmd.exe) or PowerShell as an Administrator.

Run the following command to stop the service:

Alternatively, you can open the Services application (services.msc), find the Druva-EnterpriseWorkloads Service, right-click it, and select Stop.