Redundancy is all about delivering the highest levels of reliability. In the previous article, you may recall simple definitions and descriptions of data center redundancy levels and design. We examined the differences between N, N+1, 2N, and 2N+1. We briefly discussed Tier Level and redundancy standards. In this article, we will be looking at differences in reliability and failure rates for redundancy standards. Is 2N better than N+1 or 2 (N+1) in terms of failure rates for UPS configuration? We will also look at critical power design, perhaps the most important aspect of redundancy.