Create a new version of paste:

<#
.SYNOPSIS
    Perform steps to upgrade all ESXi hosts in a cluster.
.DESCRIPTION
    Use this script to upgrade all ESXi hosts in a cluster with an offline ZIP file.

    This script assumes availability of the following modules:
    - VMware-PowerCli
.PARAMETER
    - Cluster: name of the cluster to migrate.
.EXAMPLE
    .\Upgrade-Cluster.ps1 -Cluster <clustername>
.NOTES
    Script name: Upgrade-Cluster.ps1
    Author:      Jeroen Buren
    DateCreated: 07-03-2020
#>

[CmdletBinding(SupportsShouldProcess=$true)]
Param(
    [parameter(valuefrompipeline = $true, mandatory = $true,
        HelpMessage = "Enter the name of the cluster to upgrade.")]
        [string]$ClusterName
    )


####################################################################################
#                                                                                  #
# Functions                                                                        #
#                                                                                  #
####################################################################################

function Get-ScriptDirectory {
  $Invocation = (Get-Variable MyInvocation -Scope 1).Value
  Split-Path $Invocation.MyCommand.Path
}

function Log {
  param(
    [Parameter(Mandatory=$true)][String]$Message,
    [Parameter(Mandatory=$true)][ValidateSet("Info","Debug","Warn","Error")][String]$Type,
    [Parameter(Mandatory=$true)][ValidateSet("Console","LogFile","Both")][String]$OutputMode
  )

  $dateTimeString = Get-Date -Format "yyyy-MM-dd HH:mm:sszz"
  $output = ($dateTimeString + " " + $type.ToUpper() + " " + $message)
  if ($outputMode -eq "Console" -OR $outputMode -eq "Both") {
    Write-Host $output
  }
  if ($outputMode -eq "LogFile" -OR $outputMode -eq "Both") {
    try {
      Add-Content $logFile -Value $output -ErrorAction Stop
    }
    catch {
      Log ("Failed to write to log file: """ + $logFile + """.") -OutputMode Console -Type Error
      Log ("[" + $_.Exception.GetType().FullName + "] " + $_.Exception.Message) -OutputMode Console -Type Error
    }
  }
}

####################################################################################
#                                                                                  #
# Variables                                                                        #
#                                                                                  #
####################################################################################

# Logfile
Set-Variable logFile ((Get-ScriptDirectory) + "\Upgrade-Cluster-65.log") -Option Constant -ErrorAction SilentlyContinue
$vCenter = "vCenter"
$vib = "cisco-vem-v320-esx"
$zip = "VMware-VMvisor-Installer-6.5.0.update03-15256549.x86_64-DellEMC_Customized-A05.zip"
$profile = "DellEMC-ESXi-6.5U3-15256549-A05"


####################################################################################
#                                                                                  #
# Main Code                                                                        #
#                                                                                  #
####################################################################################

Log -Message "Script started" -Type Info -OutputMode LogFile

# Connect vCenter Server
Connect-VIserver -Server $vCenter | Out-Null
Log -Message "Connected to vCenter Server" -Type Info -OutputMode Both

# Get cluster object
$cluster = Get-Cluster $clusterName

# Get two datastores with most free space
Log -Message "Selecting datastores" -Type Info -OutputMode Both
$datastore1 = ($cluster | Get-Datastore | Where-Object {$_.Name.Substring(8,3) -eq "DC1"} | Sort-Object FreeSpaceGB -Descending)[0]
$ds1url = ($datastore1.ExtensionData.Info.Url).Trim("ds:/")

$datastore2 = ($cluster | Get-Datastore | Where-Object {$_.Name.Substring(8,3) -eq "DC2"} | Sort-Object FreeSpaceGB -Descending)[0]
$ds2url = ($datastore2.ExtensionData.Info.Url).Trim("ds:/")

$datastore1 | New-DatastoreDrive -Name DC1
$datastore2 | New-DatastoreDrive -Name DC2

# Copy the offline ZIP file to the datastores
Log -Message "Copying offline ZIP file to $($datastore1.Name)" -Type Info -OutputMode Both
Copy-DatastoreItem -Item D:\Scripts\VMware\$zip -Destination DC1:\

Log -Message "Copying offline ZIP file to $($datastore2.Name)" -Type Info -OutputMode Both
Copy-DatastoreItem -Item D:\Scripts\VMware\$zip -Destination DC2:\

# Create the depot variables
$depot1 = "/$ds1url/$zip"
$depot2 = "/$ds2url/$zip"

# Disconnect all ISOs that may be attached to VMs and set the CD Drive state to "disconnected"
Log -Message "Disconnecting CD drives" -Type Info -OutputMode Both
$cluster | Get-VM | Get-CDDrive | Where-Object {($_.IsoPath -ne $null) -or ($_.ConnectionState.Connected -eq "true")} | Set-CDDrive -NoMedia -Connected:$false -Confirm:$false

# Upgrade hosts
Log -Message "Beginning upgrade of cluster" -Type Info -OutputMode Both

foreach ($h in $cluster | Get-VMHost | Where {$_.Version -ne "6.5.0"} | Sort-Object Name) {
  # Enter maintenance mode
  Log -Message "Host $($h.Name) is entering Maintenance Mode" -Type Info -OutputMode Both
  Set-VMHost -VMHost $h -State Maintenance | Out-Null
  
  # Wait for the host to enter Maintenance Mode
  do {Start-Sleep -Seconds 5} while ((Get-VMHost -Name $h.Name).ConnectionState -ne 'Maintenance')
  
  # Start removing the VIB
  Log -Message "Removing VIB from host" -Type Info -OutputMode Both
  $esxcli = Get-EsxCli -VMHost $h -V2
  $param = $esxcli.software.vib.remove.CreateArgs()
  $param.dryrun = $false
  $param.vibname = $vib
  $param.force = $false
  $esxcli.software.vib.remove.Invoke($param) | Out-Null
  

  # Update the host
  Log -Message "Upgrading host $($h.Name)" -Type Info -OutputMode Both
  
  $param = $esxcli.software.profile.update.CreateArgs()
  $param.dryrun = $false
  if ($h.Name.Substring(4,1) -eq "0") {$param.depot = $depot1}
  if ($h.Name.Substring(4,1) -eq "1") {$param.depot = $depot2}
  $param.profile = $profile

  $esxcli.software.profile.update.Invoke($param) | Out-Null

  # Reboot host and wait for it to come back
  Log -Message "Host $($h.Name) is rebooting" -Type Info -OutputMode Both
  Restart-VMHost -VMHost $h -Confirm:$false | Out-Null
  # Wait for the host to enter NotConnected state
  do {Start-Sleep -Seconds 5} while ((Get-VMHost -Name $h.Name).ConnectionState -ne 'NotResponding')

  # Wait for the host to get back
  do {Start-Sleep -Seconds 5} while ((Get-VMHost -Name $h.Name).ConnectionState -ne 'Maintenance')
  
  # Exit maintenance mode
  Log -Message "Host $($h.Name) is exiting Maintenance Mode" -Type Info -OutputMode Both
  Set-VMHost -VMHost $h -State Connected | Out-Null

  # Wait for the host to leave Maintenance Mode
  do {Start-Sleep -Seconds 5} while ((Get-VMHost -Name $h.Name).ConnectionState -ne 'Connected')

  # Next host...
  
}

# Delete offline ZIP files from datastores
Log -Message "Removing offline ZIP file from $($datastoreams.Name)" -Type Info -OutputMode Both
Get-ChildItem -Path "DC1:/$zip" | Remove-Item -Confirm:$false

Log -Message "Removing offline ZIP file from $($datastorewsn.Name)" -Type Info -OutputMode Both
Get-ChildItem -Path "DC2:/$zip" | Remove-Item -Confirm:$false

# Remove PS drives
Remove-PSDrive -Name DC1 -Confirm:$false
Remove-PSDrive -Name DC2 -Confirm:$false

# Disconnect from vCenter Servers
Disconnect-VIServer -Server $vCenter -Confirm:$false
Log -Message "Disconnected from vCenter" -Type Info -OutputMode Both

Log -Message "Script Ended" -Type Info -OutputMode LogFile