hello

what is the correct procedure to remove VMs and Hosts? 
I know the right way is to remove VMs first then remove your Host,
but I generate 20 VMs, just for testing, and I want to remove either the host who hosts this VMs

Environment:
3 servers:
srv-01 = engine , vdsm
srv-02 = vdsm  ,  spm, lots of VMs
srv-03 = vdsm , lots of VMs


I removed 2 hosts of my ovirt-engine
steps:
1) select host and put on maintenance
2) stop all VMs 
3) remove host

But in VM tab I can see all VMs and can not remove .

steps

1) select VM and click on remove
 Are you sure you want to remove the following items?
- pvm0203-2
Remove Disk(s)

2) click ok
Operation Canceled
Error while executing action:
pvm0203-2:
    Cannot remove VM. VM is attached to a VM-Pool.


What really happens here?  Where is this files located to remove manually? 

thanks


thanks