Pitt Turner IV et al. presented a good overview of datacenter tier classifications. Tier classifications define site infrastructure performance. For simplicity, consider the key differences as shown in Figure 6.40 (adapted from Pitt Turner IV et al.). Using the TCO model in the case study as a guiding framework, compare the cost implications of the different tiers shown.

Figure 6.40:

Transcribed Image Text:

Tier 1 Tier 2 Tier 3 Tier 4 Single path for power and cooling distributions, without redundant components (N+1) redundancy = two power and cooling distribution paths (N+ 2) redundancy = three power and cooling distribution paths for uptime even during maintenance Two active power and cooling distribution paths, with redundant components in each path, to tolerate any single equipment failure without impacting the load 99.0% 99.7% 99.98% 99.995%