XenCenter

Viewing Performance Data

The Performance tab shows performance data for the selected server or virtual machine in graph form.

For servers you can view:

  • CPU, memory, and network I/O usage data.
  • You can add graphs showing extra resource usage data, if necessary. For example, you can include the Control Domain Load. This load is the average (Linux loadavg) of the number of processes queued inside the control domain over the last 5 minutes.
  • Lifecycle events for all the VMs hosted on the server are shown in the VM Lifecycle Events pane.

For VMs, graphs showing CPU, memory, network I/O, and disk usage data are shown by default.

At the bottom of the tab, the summary graph gives a quick overview of what is happening on the machine. This graph also allows you to adjust the time frame that is shown in the other graphs. The time frame can be changed either to show data from a longer or shorter period, or to show data from an earlier period.

To include other types of performance data on the tab or to change the appearance of the graphs, see Configuring performance graphs.

To view data from a longer or shorter time period

By default, data from the last 10 minutes is displayed. To view data from a longer or shorter time period, do one of the following:

  • To view available performance data for the last hour, 24 hours, week, month, or year, click Zoom. Select 1 Hour, 1 Day, 1 Week, 1 Month, or 1 Year.
  • To resize the time period that is displayed in the graphs, in the summary graph, point to the vertical split bar at the edge of the sample area. When the pointer changes to a double-headed arrow, drag the vertical split bar right or left.

    Resize cursor.

    For example:

    Two images. The top shows a 10 minute interval selected with the resize cursor hovering over one end of the timeframe. The second image is after the resize cursor has been used. The window has been enlarged to 40 minutes.

To view data from a different time period

To move the time frame for data displayed in the graphs, point to any graph. When the pointer changes to a move cursor, drag the graph or the sample area in the summary graph to the left or right.

The Move Cursor icon - an equal armed cross with an arrowhead at each line end.

For example:

Two images. The top shows a 40 minute interval selected with the move cursor. An arrow on the diagram indicates the direction that the cursor is to be moved. The second image is after the move cursor has been used. The window has been shifted to highlight an earlier 40 minutes.

To view VM lifecycle event data on a server

To view lifecycle events for the VMs hosted on a server, use the VM Lifecycle Events list.

  • Each event has a tooltip with the full message for that lifecycle event (“Virtual Machine ‘Sierra’ has been started”).
  • You can use the cursor keys to navigate the items in the list.
  • Double clicking or pressing Enter zooms the graphs to the point when the selected lifecycle event occurred.
  • Selecting (single click or highlight with cursor keys) one of the events causes the lifecycle event on the graph itself to be highlighted.

Viewing Performance Data