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[esarakaitis]

Code:

Get-VMhost | select Name, MemoryTotalMB,
@{Name="nVMs"; Expression={ ($_ | Get-VM | Measure-Object).Count } },
@{ Name="VM_Mem"; Expression= { ($_ | get-vm | measure-object -property memorymb -sum).sum } }

[esarakaitis]

here is some cleaner code

Code:

foreach ($vmhost in get-cluster | get-vmhost)
{
$meminfo = $vmhost | get-vm | measure-object -property memorymb -sum
$guestcount = $vmhost | get-vm |  measure-object
    "" | select-object @{Name="Host"; Expression={$vmhost.name}},
                       @{Name="Num VM's"; Expression={$guestcount.count}},
                       @{Name="Mem Allocation"; Expression={$meminfo.Sum}}
 }