[Restart all Hosts in Cluster without DRS] Restart all #ESXi Hosts in a cluster

restart_all_hosts.ps1

$VerbosePreference = 'Continue'
foreach ($vmh in (Get-VmHost))
{
    Write-Verbose "Move all VMs from $vm to $targetHost"
    $vmh | Get-VM | Move-VM -Destination $targetVMHost

    Write-Verbose "Send $vmh to Maintenance mode"
    $vmh | Set-VMHost -State Maintenance

    Write-Verbose "Restart $vmh"
    $vmh | Restart-VMHost -Confirm:0
    while((Get-vmhost $vmh).ConnectionState -eq 'NotResponding') { sleep -Seconds 10  }
    Write-Verbose "$vmh entered state $($vmh.ConnectionState)"
    
    $vmh | Set-VMHost -State Connected
    while((Get-vmhost $vmh).ConnectionState -ne 'Connected') { sleep -Seconds 10  }
    Write-Verbose "$vmh entered state $($vmh.ConnectionState)"
    $targetVMHost = $vmh
    Start-Sleep -Seconds 60
}