A volatile coupling facility is one in which interruption of the power supply causes loss of the memory contents. You can make a standalone coupling facility nonvolatile by adding to it an uninterruptible power supply, which provides power during external power failures. As an alternative, you can use a battery backup, which uses internal batteries to provide power during an outage.

The batteries last for a few minutes if the coupling facility continues to run. You can use the internal batteries to supply power for the power-saver state, in which they keep only the memory active during a power outage.

In general, you should put lock structures and list structures for the system logger in nonvolatile coupling facilities.