Monitoring VM Resource Usage in VMware vSphere with PowerShell

Keeping track of resource usage for your virtual machines in VMware vSphere is vital for efficient resource allocation and performance optimization. This PowerShell script provides a way to gather CPU and memory usage statistics for specified VMs, helping you monitor their performance effectively.
### Step 1: Load the VMware PowerCLI Module
Start by loading the VMware PowerCLI module, which is required for interacting with your vSphere environment.
“`powershell

# Load VMware PowerCLI module
Import-Module VMware.PowerCLI

“`
### Step 2: Connect to the vSphere Server
Next, establish a connection to your vSphere server using your credentials. Replace the placeholders with your actual server details.
“`powershell

# Connect to vSphere server
$vCenterServer = "your_vcenter_server"
$username = "your_username"
$password = "your_password"
Connect-VIServer -Server $vCenterServer -User $username -Password $password

“`
### Step 3: Define Virtual Machines for Monitoring
Specify the names of the VMs that you want to monitor. You can add or remove VM names from this list as needed.
“`powershell

# Define virtual machines to monitor
$vmNames = @("VM1", "VM2", "VM3") # Substitute with your VM names

“`
### Step 4: Gather Resource Usage Data
This part of the script retrieves the CPU and memory usage for each specified VM and displays the results.
“`powershell

# Gather and display CPU and memory usage
foreach ($vmName in $vmNames) {
    $vm = Get-VM -Name $vmName
    if ($null -ne $vm) {
        $cpuUsage = Get-Stat -Entity $vm -Stat "cpu.usage.average" -Realtime | Measure-Object -Property Value -Average | Select-Object -ExpandProperty Average
        $memUsage = Get-Stat -Entity $vm -Stat "mem.usage.average" -Realtime | Measure-Object -Property Value -Average | Select-Object -ExpandProperty Average
        Write-Host "VM: $vmName, CPU Usage: $cpuUsage%, Memory Usage: $memUsage%"
    } else {
        Write-Host "VM $vmName not found."
    }
}

“`
### Step 5: Disconnect from the vSphere Server
Lastly, ensure that you disconnect from the vSphere server to maintain security and free up resources.
“`powershell

# Disconnect from vSphere
Disconnect-VIServer -Server $vCenterServer -Confirm:$false

“`
This script allows you to monitor the resource usage of your VMs easily. By incorporating these insights into your management practices, you can enhance the performance and efficiency of your virtual environments.
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