After doing a lift & shift of VMs into Azue, their page file may still be on the C drive (or whatever its original location), rather than on the temporary storage available to the new AZ VM (giving better perfromance). This script scans all VMs to help flag such issues.

Get-AzVmPageFileInfo.ps1

Login-AzAccount # opens browser for interactive login
$subscriptions = Get-AzSubscription | 
    Where-Object {$_.State -eq 'Enabled'} |
    Select-Object -ExpandProperty 'Id'

$script = @'
$driveInfo = Get-PSDrive -PSProvider FileSystem | Select-Object Root, Description
$pageFileDrive = Get-WmiObject Win32_Pagefile | Select-Object -ExpandProperty Drive
([PSCustomObject]@{
    DriveInfo = ($driveInfo | %{"$($_.Root) = $($_.Description)"}) -join '; '
    PageFileDrive = $pageFileDrive
    PageFileOnTemp = [bool]($driveInfo | ?{$_.Root -eq "$pageFileDrive\"} | ?{$_.Description -eq 'Temporary Storage'})
}) | ConvertTo-Json -Depth 3
'@

foreach ($subscription in $subscriptions) {
    
    Set-AzContext -Subscription $subscription | Out-Null
    
    $vms = Get-AzVM -Status | 
        Where-Object {$_.PowerState -eq 'VM running' } |
        Where-Object {$_.StorageProfile.OSDisk.OSType -eq 'Windows'} 
    
	Write-Verbose "Found $($vms.Count) VMs in sub [$subscription]" -Verbose
	
    $vms | ForEach-Object -Parallel { 
        $result = (Invoke-AzVMRunCommand -ResourceGroupName $_.ResourceGroupName -Name $_.Name -CommandId 'RunPowerShellScript' -ScriptString $using:script) 
		$result.value[0].message | ConvertFrom-Json -Depth 3 |  
			Add-Member -Type NoteProperty -Name 'Sub' -Value $using:subscription -PassThru | 
			Add-Member -Type NoteProperty -Name 'RG' -Value ($_.ResourceGroupName) -PassThru | 
			Add-Member -Type NoteProperty -Name 'VM' -Value ($_.Name) -PassThru  
    } | Export-Csv -Path ".\$($subscription)_VMInfo.csv" 
}