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I just checked the man page for sar. It is unusually easy to understand. I've used sar on certain occassions but I don't find the need for it on a regular basis. In my estimation, and as is implied at the bottom of the man page, the sar command simply puts the functions of the vmstat, iostat, ps, and top commands in one utility. It is useful for analyzing system usage and workloads. This information can be used for system configuration, tuning, and managing the workload.
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