Murphy’s Law applied to power failures
Some observations after a power failure at my office:
- Because of low occurence probability a UPS configuration update/test can stay an the end of a todo-list for months and years.
- Over time too many devices are attached to one UPS.
- On power failure the battery running time is always shorter than previously measured in self-test.
- Some devices just do not shutdown fast enough.
- Those devices that do shutdown correctly will have errors at startup instead.