Comment 3 for bug 1495925

Actual state for 8.0:

Step for reproduce:
1. Deploy cluster in Dualhypervisor mode
2. Run a instance via horizon in vcenter availability zone
3. Disconnect vCenter and MOS

Expected result:
Horizon shows status "disabled", state "down" for vcenter hosts
Horizon does not allow to create instances in vcenter availability zone

Actual result:
Horizon shows status "enabled", state "up" for vcenter hosts
Horizon allows to create instances in vcenter availability zone.
After 56 minutes show error:

Error: Failed to perform requested operation on instance "vc2", the instance has an error status: Please try again later
[Error: Build of instance 447be318-b4ff-46df-93c9-8f997fa02304 aborted: Could not clean up failed build, not rescheduling].