Key Performance Indictors (Best Practice Performance Guidelines) You can view the key metrics that are outside of a standard range for storage systems that run  IBM FlashSystem 9100 by using the performance guidelines. The guidelines were  established by a historical analysis of storage environments. Most of the performance charts show an orange line that indicates the best practice value for  the metric. These guidelines are established as the levels that allow for a diverse set of  workload characteristics while maintaining a stable performance profile. The other lines on  each chart represent the measured values for the metric for the resources on your storage  system: I/O groups, ports, or canisters.  You can use the lines to compare how close to potentially becoming overloaded your  resources are. If your storage system is responding poorly and the charts indicate overloaded  resources, you might have to better balance the workload. You can balance the workload  between the canisters of the cluster, potentially adding more canisters to the cluster, or move  some workload to other storage systems. Figure 8-7 shows the Key Performance Indicators in the Dashboard. The charts show the hourly performance data measured for each resource on the selected  day. Use the following charts to compare the workloads on your storage system with the best  practice guidelines: GLYPH<SM590000> Overall Port Bandwidth Percentage by Port : Compare the guideline value for this  metric, for example, 50%, with the measured value from your system. Because a cluster  can have many ports, the chart shows only the eight ports with the highest average  bandwidth over the selected day.  GLYPH<SM590000> Node Utilization Percentage by Node : Compare the guideline value for this metric, for  example, 60% utilization, with the measured value from your system.  The average of the bandwidth percentages of those ports in the node that are actively  used for host and MDisk send and receive operations. The average is weighted by port  speed and adjusted according to the technology limitations of the node hardware. For clusters without FC ports this chart is empty (or when no host I/O is going on). Chapter 8. Monitoring  275 Figure 8-7 DashBoard- Key Performance Indicators