Fail-safe power and environmental facilities for a large computer installation

For a modern large-scale computer installation, the reliability of the power supply and environmental conditioning systems is as important a consideration as the reliability of the computing equipment itself. This is especially true of installations which involve on-line real-time and time-sharing operations, in which no convenient re-start point is available for resumption of operations after an outage. It is becoming more and more important in batch operations, many of which have grown in scale to the point where the expense of lost time due to re-starts can be a major economic factor.