More Than Two Concurrent Deployments from the Same SAN-based Virtual Machine Template or Across a Firewall Might Fail

If a template is located on the VirtualCenter server, the concurrent deploy feature works correctly. Concurrent clones of a virtual machine work correctly independent of the location of the source virtual machine. Concurrent deployment of a template works correctly, only if all the deployed virtual machines are to the same destination host.

When you attempt a large number of virtual machine provisioning operations (such as deployments, cloning and migration) over a network with limited bandwidth, either the host becomes disconnected or some of the operations fail.

Indications include:

• The host moves from a Connected to a Reconnecting state.
• A message similar to Network copy failed appears, and the operation fails.

The number of concurrent deployments you perfom can be limited, depending upon the type of firewall you are using. Some firewalls permit as few as two concurrent template deployments. Other firewalls permit as many at six or eight concurrent template deployments.

To resolve the problem, reduce the number of concurrent provisioning operations.