Dear Team
Both VC7-1 and VC7-2 were powered on from the ESXi hosts in order to boot them up. * VC7-2 is up without any issues related to the VMs or the hosts. The NAbox VM is up and running and can be accessed from the UI.

• VC7-1 — all LUNs appear to be up and working fine:
  • PerfTest_VC7_1_FC_10TB
  • PerfTest_VC7_1_ISCSI_24TB

However, all the VMs on the above LUNs are in an “inaccessible” state from the vSphere inventory view.
When attempting to fix the situation by using “Delete from Disk”, vCenter returned the following error:
"This action is not available for any of the selected objects at this time. The selected virtual machines cannot be deleted in their current state, or you do not have the required privileges to delete them."
 
Because of this, I had to remove the problematic VMs from the inventory and then manually delete their folders directly from the datastore in order to reclaim the space.
I am planning to re-create all the regression templates from scratch using the local ESXi disks (which I have backed up just in case), and then run the population again.Currently  ./Popultion_Template-A.ps1  is executed :
              50VMs > FC LUN
              30VMs > ISCSI  LUN

next plan : 

Popultion_Template-A.ps1
Popultion_Template-B.ps1
Popultion_Template-C.ps1
Popultion_Template-D.ps1
Popultion_Template-E.ps1
Popultion_Template-F.ps1