On the four-node cluster, the automated approach required 90 percent less focused, concentrated effort compared with the manual approach, as shown in the following figure. As previously noted, periodic progress monitoring is part of unattended time; thus, it is not addressed in the figure.
Table 4 shows that the automated approach on the four-node cluster in the lab required only 5 minutes of attended time and does not change as the cluster is expanded. Table 5 shows that the manual approach on the four-node cluster in the lab required 51 minutes and increases incrementally as more nodes are added to the cluster. Thus, predictions for a 16-node cluster indicate that IT operators could save almost 3 hours of attended time by using the automated approach—a 97 percent reduction compared with the manual approach.