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Process accounting should help track down which process is loading down the system. In Centos the package name is psacct. Tecmint has an article on starting with process accounting.


I have found that this happens when adding/removing (v)CPUs. Doing that probably adds/removes columns in the data file format or something. Removing the "invalid" saXX files and simply running sar caused it to regenerate and start collecting data again.

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