addDisktoVMs.ps1

#Script to add disk to VMs by Peter Hynes
#Version 1.0
#Created on the 27\09\2018
#Connect to the vCenter or vcenters and Run within PowerCLI
#You will need to create a txt file called vms.txt and place it in the same folder as this script. Put the list of VMs you are working with in this txt file.

$vcenter = Read-Host "Enter name of the vcenter you are working in"

#Connect to vcenter
connect-viserver $vcenter

#Prompt for new disk size
$diskSize = Read-Host "Enter the size of the disk you want to add"

#Create list of VMs from vms.txt file
$vms = get-content .\vms.txt

#List datastore cluster
Write-Host "Listing DataStoreClusters your VMs are on" -foregroundcolor Green
get-vm $vms | Get-DatastoreCluster | select name, @{N="Percentage Free Space(%)";E={[math]::Round(($_.FreeSpaceGB)/($_.CapacityGB)*100,2)}}

#loop through list of vms, check for space on datastorecluster and add disk if availible space is greater then 20%
foreach($vm in $vms){
    $overProvisioned = get-vm $vms | Get-DatastoreCluster | select name, @{N="Percentage Free Space(%)";E={[math]::Round(($_.FreeSpaceGB)/($_.CapacityGB)*100,2)}} | where {$_."Percentage Free Space(%)" -le 10}
    $dsc = get-vm $vm | Get-DatastoreCluster | select -ExpandProperty name
    if($overProvisioned) {
        Write-Host "DataStoreCluster $dsc has capacity less than 10%...Disk cannot be added to $vm" -foregroundcolor Yellow
        $vm | Out-File -FilePath .\diskNotAddedList.txt -Append
    }
    else{
        Write-Host "Adding disk for $vm" -foregroundcolor Green
        New-HardDisk -vm $vm -CapacityGB $diskSize -Persistence persistent -StorageFormat Thin -confirm:$false -ErrorAction SilentlyContinue -ErrorVariable AddError | Out-Null
        if ($AddError) {
            Write-host "failed to add disk to $vm..check manually..." -foregroundcolor Yellow
            $vm | Out-File -FilePath .\diskNotAddedList.txt -Append
        }
        else{
            Write-Host "$diskSize GB disk added to $vm" -foregroundcolor Green
        }

    }
}

Disconnect-VIServer -Server $defaultVIServers -Confirm:$false -ErrorAction SilentlyContinue
Write-Host "Script complete" -foregroundcolor Green