6.11.3 DRS/DPM Network Policies

Both the DRS and DPM policies can also be set for the networks used by Oracle VM Servers in a server pool. When a network used by an Oracle VM Server exceeds its threshold, virtual machines are migrated to other Oracle VM Servers to either balance the resources used (DRS), or reduce the power used (DPM). Each network on an Oracle VM Server can have a threshold set. The threshold applies to either the received data or the transmitted data. If the threshold is set to say 50%, when an Oracle VM Server's receive or transmit traffic on that network exceeds 50% of the theoretical capacity of the network, the Oracle VM Server is deemed to be over the threshold. The theoretical capacity of a network on an Oracle VM Server is equal to the port speed of the physical Ethernet adapter on the Oracle VM Server. If the network is bonded in a fail-over configuration, then the port capacity is equal to the port speed of one of the Ethernet adapters. If the network is bonded on a Oracle VM Server with link aggregation, then the network capacity is equal to the sum of the speed of the bonded Ethernet adapters.

You set the network policies for DRS and DPM when you set up the server pool policy. See Define or Edit Server Pool Policies in the Oracle VM Manager User's Guide for information on enabling and configuring network DRS and DPM policies in a server pool.

It is important to understand that a network policy can be defined for a server pool, even if that network is not used by any servers in the server pool. In this case, the policy is simply ignored, however if a server with the network attached is added to the server pool at a later date, the policy is automatically enabled for the network attached to that server. If you define a network policy on a server pool and later remove all of the servers that had that network attached, the policy still remains enforced on the server pool. Therefore, it is always good practice to regularly check the server pool policy when adding servers to a server pool, since an old policy may be in place that affects the behavior of the network.