Dell PowerVault ME4 Series Storage System Administrator’s Guide

View performance statistics

1. In the Performance topic, select a component type from the Show list. The components table shows information about each component of that type in the system.
2. Select one or more components in the list.
3. Click Show Data. The Current Data area shows the sample time, which is the date and time when the data sample was collected. It also shows the total duration of all data samples, which is the time period between collection and display of the current sample, the previous sample, if any, and a table of current performance statistics for each selected component.
4. To view graphs of historical data for the selected disks, disk groups, virtual pools, or virtual tiers, select the Historical Data check box. The Historical Data area shows the time range of samples whose data is represented by the graphs, and the Total IOPS graph by default.
5. To specify either a time range or a count of historical statistics samples to display, perform the following:
   • Click Set time range. The Update Historical Statistics panel opens and shows the default count value of 100.
   • To specify a count, in the Count field, enter a value in the range of 5–100 and click OK.
   • To specify a time range, perform the following:
     • Select the Time Range check box.
     • Set date/time values for the starting and ending samples. The values must be between the current date/time and 6 months in the past. The ending values must be more recent than the starting values.
       NOTE:If you specify a time range, it is recommended to specify a range of 24 hours or less.
     • Click OK. In the Historical Data area, the Time Range values are updated to show the times of the oldest and newest samples displayed, and the graph for the selected components is updated.
6. To view different historical statistics, select a graph from the Statistics list. For a description of each graph, see Historical performance graphs.
7. To hide the legend in the upper right corner of a historical statistics graph, clear the Show Legend check box.