Network configuration is a complex operation involving many different elements in the physical and logical environment. Many instructions are sent to the Oracle VM Servers in the process, and if a single instruction in a whole sequence goes wrong, the resulting state of the network configuration is unpredictable. To avoid badly or partly configured network objects, which become unusable, Oracle VM Manager has a mechanism in place that is triggered when a network operation fails: a network discovery is launched for each Oracle VM Server that participated in the operation, and the commands that completed successfully are reflected in the network model displayed in the Oracle VM Manager Web Interface.
The moment a network operation fails, an event is created. In the Oracle VM Manager Web Interface this event is displayed in the Events tab of each affected Oracle VM Server. When the subsequent automatic network discovery completes, the event is also automatically acknowledged. Note that if you acknowledge the event manually, the discovery operation is not cancelled. Jobs and events are discussed in more detail in Chapter 8, Understanding Jobs, Events and Errors.
The automatic network discovery is not instantaneous. The operations start as soon as the job fails, but could take some time to finish: from a few seconds to a couple of minutes. This will depend on how complicated the network configuration is and how many Oracle VM Servers are involved.
During network discovery, resources may be locked or may change to reflect the new state of the Oracle VM Servers. To avoid resource locking issues and further failing operations, it is recommended that you wait for the discovery operation to complete before you resume the reconfiguration of the network. Check the events for each Oracle VM Server to know the status of the operation.
In case your network configuration returns a failed job, you have to manually go through all the physical and logical network elements involved and make the necessary changes one by one in Oracle VM Manager. Typical network elements include: network interfaces, Ethernet ports, bond ports, VLAN interfaces and IP addresses. The amount of manual reconfiguration depends on the complexity of your network configuration and the number of Oracle VM Servers involved.