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I have an issue with sar on several machines running ORACLE Linux 6.4. Sometimes it shows zero load (CPU, block device, whatever else), including idle:

enter image description here Why can it happen?

sysstat package version is 9.0.4-20.el6.x86_64.

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    Load average is not a percentage. – jordanm Aug 19 '15 at 13:21
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Your CPU shows zero for all fields probably because it has been set offline.

From sar's manual page:

"On SMP machines a processor that does not have any activity at all (0.00 for every field) is a disabled (offline) processor."

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