Automatically Power On VMs in PowerCLI

PowerOn_VMs_Automatic.ps1

[CmdletBinding()]
param()
$PowerOffServers=@()
######## test if the backup csv file exists and if not, create a new one with the current powerstate of All VMs#####
if(Test-Path ToPowerOnVMs.csv)
{
import-csv ToPowerOnVMs.csv | where { $_.PowerState -eq "PoweredOn"}| foreach {
try {
	$vminfo=get-vm $_.Name -Ea stop

	if ( $vminfo.PowerState -eq "PoweredOff")
		{
		$PowerOffServers+=$vminfo | select Name, PowerState
		}
	}
catch {
		Write-Host  -Fore Red "Unable to get-vm state for $_.VM"
	} 
}

if ($PowerOffServers.count)
{
	Write-Host "The list of Poweroff Servers are"
	$PowerOffServers | ft Name, PowerState -auto
	Write-Host -Fore red "$($PowerOffServers.count) VMs are currently Powered Off"
	[console]::ForeGroundColor="yellow"
	$PowerOnConfirm=Read-Host "Do you want to start all Powered Off Servers ?(y/n)"
	[console]::ForeGroundColor="white"

	if ($PowerOnConfirm -eq 'y')
		{
		$PowerOnServers=0
		foreach ($VM in $PowerOffServers)
			{ $result=Start-VM $VM.Name
			if ($result.PowerState -eq "PoweredOn"){ $PowerOnServers++ }
			$Percent=[math]::round(($PowerOnServers/$PowerOffServers.count) * 100)
			write-progress -id 1 -activity "Powering On VMs" -percentComplete $Percent -CurrentOperation "$Percent% Complete. Powering On $($VM.Name)"
			}
		}
	}
else
	{
	$VMsAlreadyPoweredOn=1;
	Write-Host -fore green "All Necessary VMs have been already Powered On"
	}
############ Re-test if there are any servers left powered off ############
$PowerOffServers=$null									##### reset the value to count the poweroff servers again
import-csv ToPowerOnVMs.csv | where { $_.PowerState -eq "PoweredOn"}| foreach {
	try {
		$vminfo=get-vm $_.Name -Ea stop

		if ( $vminfo.PowerState -eq "PoweredOff")
			{
				$PowerOffServers+=$vminfo | select Name, PowerState
			}
		}
	catch {
			Write-Host  -Fore Red "Unable to get-vm state for $_.VM"
			} 
	}
####### Test if the Powered On servers are actually running ########
	if ($PowerOffServers.count) 
		{ Write-Host -fore Red "The following Servers cannot be Powered On" }
	elseif ($VMsAlreadyPoweredOn)
		{ }	
	else {Write-Host -fore Green "All VMs have been successfully Powered On" }
}
else
	{
	Write-Host -fore yellow "No VM Powerstate backup file found. Getting the current Powerstate info and saving to file..."
	$VMs=Get-VM | select Name,Powerstate
	$VMs | Export-Csv ToPowerOnVMs.csv -NoTypeInformation
	Get-ChildItem ToPowerOnVMs.csv | select name,Length,@{Name="No. of VMs";Exp={$VMs.count}} | ft -auto
	}