Monday, May 9, 2011

Why crosscable is not supported in Oracle RAC?

Although it is possible in a two-node cluster to have the private network consist of a simple crossover cable, this is not recommended (or supported), because some network interface cards (NICs) and drivers require media sensing, which is not available without connectivity to a switch. For example, if one node is powered down, the card for the interconnect on the surviving node is disabled, because no more activity is being sensed across the interconnect. This can lead to errors on the surviving node.