Powershell: Find largest VM disk

Sometimes you need to find the largest virtual disk. Lets say if you are sizing LUNs for datastores.

Here is a script that help you do that.

Requirement are powershell and the VMware.PowerCLI module.

Use it at your own risk.

Import-Module VMware.PowerCLI

Connect-VIServer <vCenter Name>


Function Get-LargestDisk {
  param(
    $Datastores=$null
  )
  $largest = 0

  if ($Datastores -eq $null) {
    Write-Host "Searching through all VMs."
    $vms = Get-VM
  } else {
    Write-Host "Searching through VMs on datastores: $Datastores"
    $vms = $Datastores | Get-VM
  }

  foreach ($vm in $vms) {
    $hdds = $vm | Get-HardDisk

    foreach ($hdd in $hdds) {
      $size = $hdd.CapacityGB

      if ($size -gt $largest) {
        Write-Host "Found a larger VM: $vm Size: $size GB"
        $largestVm = $vm
        $largest = [math]::Round($size)
      }
    }
  }
  Write-Host "Largest Disk: $largest GB Largest VM: $largestVm"
}

Get-LargestDisk -Datastore (Get-Datastore V7000*)

Powershell: Migrate Standard Portgroups

Hi, just wanted to share this piece of code with you. This short script creates a mirror of virtual portgroups from one vSphere ESXi host to another.

I only takes the name and vlan id into account, so all policies, nics and other settings are not migrated at this time, but it is easy to do. I however does not always want that.

You need VMware.PowerCLI module for it to work.

Use it at you own risk.

Import-Module VMware.PowerCLI

connect-viserver <vCenter Name>

$srcHost = Get-VMHost <Source Host Name>
$dstHost = Get-VMHost <Destination Host Name>

# Change the source and destination switch names if you need to
$srcSwitch = $srcHost | Get-VirtualSwitch -Name vSwitch0
$dstSwitch = $dstHost | Get-VirtualSwitch -Name vSwitch0

$srcPGs = $srcSwitch | Get-VirtualPortGroup
$dstSwitch = $dstHost | Get-VirtualSwitch -Name vSwitch1 -ErrorAction:SilentlyContinue
if ($dstSwitch -eq $null) {
  $dstSwitch = $dstHost | New-VirtualSwitch -Name $srcSwitch.Name
}

foreach ($srcPg in $srcPGs) {
  $pgName = $srcPg.name
  $pgVlan = $srcPg.VLanId

  $pgExists = $false
  foreach ($dstPg in $dstPGs) {
    if ($dstPg.Name -eq $pgName) {
      $pgExists = $true
    }
  }
  if (-not $pgExists) {
    #Write-Host "Creating portgroup $pgName with vlan $pgVlan"
    $dstSwitch | New-VirtualPortGroup -Name $pgName -VLanId $pgVlan
  }
}