A powershell script to leverage VMware PowerCLI to connect to vSphere/ ESXi and bulk add a standardized hard drive configuration to a set of VMs loaded from a text file.

BulkHDDadd-vmware.ps1

#Loads a plain text list of VMs, Bulk adds disks based on specs below. 
#If you do not have a credential.xml run the following to generate:
#$credpath = "c:\scripts\MyCredential.xml" ##Path to store credentials
#New-Object System.Management.Automation.PSCredential("VSPHERE.LOCAL\Administrator", (ConvertTo-SecureString -AsPlainText -Force "Plaintext password")) | Export-CliXml $credpath 


$vmlist = Get-Content -Patch "c:\scripts\vms.txt"  #Location of VMList
$size = "40" #Disk Size in GB
$format = "thick" #Disk Format
$datastore = "VMFS07_PURE04" #Datastore name
$credpath = "c:\scripts\MyCredential.xml" #Set the location of the credentials created in step 1
$cred = import-clixml -path $credpath           #Import the credentials as a Powershell credentials object
Get-Module -ListAvailable VMware* | Import-Module #Load all VMware Powershell Modules
Connect-VIServer -Server 10.10.6.40 -credential $cred #connect to vcenter using the powershell credentials object imported above

#Iterate through list of VMs adding disks
foreach ($vmname in $vmlist) {
	$vm = get-vm $vmname
	write-host "Adding new $size disk to $vm on $datastore" 
	New-HardDisk -vm $vm -CapacityGB $size -Datastore $datastore -StorageFormat $format
	}