How can I find the file system usage of VMs only on particular devices?

I want to find the VM file system usage, but only on VMs that have a vmdk on a particular device. The VM host could have storage from multiple devices, for instance EMC and IBM devices. I only want to know the amount of space used by VMs that have storage on an IBM device.

I'm trying to use powercli to find this information, but I can't 'tie' the information together. I'm not a VMWare admin, and so I'm having a hard time finding the correlation (and if my terminology is incorrect, sorry about that.)

I can find only the IBM disks with the following command:

Get-VMHost <host> | Get-VMHostHba -type FibreChannel | Get-ScsiLun -CanonicalName eui* -LunType disk

I can also get the file system usage with the following:

$AllVMs = Get-VMHost <host> | Get-VM
ForEach ($VM in $AllVMs) {

    $Views = $VM | Get-View
    ForEach ($View in $Views) {

        Foreach ($Disk in $View.Guest.Disk) {

            $disk.DiskPath
            ([math]::Round($disk.Capacity/ 1MB))
            ([math]::Round($disk.FreeSpace / 1MB))
        }
    }
}

However, how can I be sure that c:\ on host1 is on an IBM array and not an EMC array?