Capacity Planning
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SarCheck allows you to do some basic capacity planning by identifying the resource with the least remaining capacity at its busiest time of day.  The data can be presented graphically and as text in order to be understood quickly.

 

CAPACITY PLANNING SECTION

This section is designed to provide the user with a rudimentary linear capacity planning model and should be used for rough approximations only. These estimates assume that an increase in workload will affect the usage of all resources equally. These estimates should be used on days when the load is heaviest to determine approximately how much spare capacity remains at peak times.

Based on the limited data available in this single sar report, the system should be able to support a very limited increase in workload at peak times before the first resource bottleneck affects performance. See the following paragraphs for additional information.

Graph of remaining room for growth

The CPU can support an increase in workload of at least 100 percent at peak times. Since page outs and/or swapping were detected, an increase in workload should be accompanied by an increase in memory. The busiest disk can support a workload increase of at least 100 percent at peak times. For more information on peak CPU and disk utilization, refer to the Resource Analysis section of this report.

All system tables measured by sar -v can hold at least twice as many entries as were seen.