Graphs showing more than one metric can be displayed either stacked or unstacked. When stacked, the metric data points are added such that the top-most category on the graph plots the sum of all the metrics. You can specify that all graphs be stacked with the /STACK qualifier or you can specify that none are to be stacked with the /NOSTACK qualifier. Also, each graph you request can have its own specific stack or nostack attribute.
Stacking is provided by default on some graphs, where it makes good sense to do so, and the remaining graphs are provided unstacked. Specifically, rates, percentages, and counts are stacked by default, and response times, I/O size, and disk space utilization are unstacked, by default.
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