Dell PowerVault ME5 Series Administrator's Guide

Displaying performance data

Performance metrics are displayed in graphs, allowing for easy charting, data comparison, and analysis. Data points in each graph line up from top to bottom, allowing you to easily compare data points between graphs when hovering over them.

The following options are available when in expanded view:

• Click the Data Timeframe dropdown to view metrics within a select time range. Last 1 day is the default.
  NOTE:Choosing Live refreshes the graphs every five seconds while in expanded view and displays up to the last 15 minutes of data in five second increments. Viewing live graphs can only be done in expanded view. Graphs shown in compact view reflect the date range that is selected in expanded view except for the Live option. When Live is selected, static graphs display the most recent historical data for the last four-hour period when you return to compact view.
• Click to view average and peak data values.
• Click Add Graph to build a graph by selecting metrics from a predefined list. Graph settings are unique to each graph. The maximum number of objects that can be in any single graph is four (volumes, host ports, and so forth). Also, each object can be charted up to three times in the same graph for a comparison (for example, read vs write vs total operations).
• Click to designate performance metric favorites (displayed in compact view). Default favorites include System IOPS, System Throughput, and System Latency (displaying both Read/Write).
• Click or to move the graph up or down in the display.
• Click to access the configuration options for the graph.
• Click to download historical performance metrics in CSV format.
• Click to remove the graph from view. (The graph can be added back.)

The system retains historical data for one week, or since the last controller restart if that is more recent. By default, the graphs show the latest 100 data points. If a time range or count of samples returns more than 100 data points, adjacent data samples are combined so that only 100 data points are shown. These combined data points are displayed on the graph.