Sar is a monitoring tool and alone is unlikely to be sufficient for the diagnosis of a performance issue (Doc ID 1566260.1)

Last updated on JULY 05, 2022

Applies to:

Purpose

Sar can be a useful tool for performance related issues, providing a high level view of the system's activity or as a monitoring tool. Although sar is easy to configure to capture system data, it is not multiprocessor aware and provides a high level look at system performance metrics. Sar data alone is not likely to be sufficient for diagnosis of a performance issue.

Sar data may be used to provide useful information such as historic data showing high system time, disk service times, large run queues, memory and swap usage etc which can be linked to the period of a performance issue, however this is not data that can be used to diagnose the cause. We may already have sar data that covers a past problem period in which case it could be used to help direct the next steps of analysis should the fault return.

Details

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