4.2. Charts

The Charts sub-tab allows you to view a trend in performance for a host. Use the Host selector to select the host of interest and the Chart selector to select the performance metrics to trend. You can also select specific time interval (Chapter 9, Selecting a time period ) over which to trend the data.

4.2.1. Physical host charts

If you select a physical host, the following charts are available:

CPU Utilization
The CPU utilization for each of the following categories: user, nice, system, IO wait, IRQ, Soft IRQ.
CPU load
1 minute, 5 minute, and 15 minute load averages.
Processes
Number of CPUs and number of processes running.
Interrupts
Number of interrupts/s and number of context switches/s.
Memory usage
Memory usage for each of the following categories: used, shared, buffers, cache, free.
Memory paging
Pages/s in and out.
Memory swapping
Pages/s swapped in and out.
Disk IO
Bytes/s read and written.
Disk usage
Disk space used and free.
Network bytes
Bytes/s received and sent over the network interfaces.
Network packets
Packet/s received and sent for each of the following categories: packets, drops, errors.

4.2.2. Virtual host charts

If you select a virtual machine, the following charts are available:

vCPU utilization
% time that the CPU is busy.
vMemory usage
Memory used and free.
vDisk IO
Bytes/s read and written.
vDisk usage
Disk space allocated and available.
Network bytes
Bytes/s received and sent over the network interfaces.
Network packets
Packet/s received and sent for each of the following categories: packets, drops, errors.

4.2.3. Using the legend to select one counter

Sometimes one performance counter value can be much smaller than the other performance counters, making it hard to see the the smaller counter value trend. In this case, you can view the trend for only the smaller counter, by clicking on the legend item corresponding to the counter of interest. For example, when viewing the CPU Utilization chart, clicking with the left mouse button on I/O wait will change the chart to display only the trend for percent of CPU time spent waiting for IO; an additional trend line for the % of CPU time spent executing user processes can be added to the chart using Shift+left mouse button on User; or clicking with the left mouse button on I/O wait or the background of the legend area will cause all trend lines to be displayed again.