Hot answers tagged sar
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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