Why is sar reporting CPU %idle greater than 100 in Red Hat Enterprise Linux 5 ?

Solution Verified - Updated -

Issue

  • Sar is reporting CPU idle % greater than 100 in Red Hat Enterprise Linux 5

  • Reading the sar file:

# sar -u -f /var/log/sa/saXX
01:40:18 PM CPU %user  %nice   %system   %iowait    %steal     %idle
11:40:02 PM all  0.18   0.00      0.63      0.01      0.00     99.18
11:50:01 PM all  0.17   0.00      0.72      0.01      0.00     99.10
12:00:01 AM all  5.31   0.28      2.21      0.54      0.00    348.96
12:10:01 AM all  5.90   0.00      2.45      1.13      0.00     90.51
12:20:01 AM all  3.94   0.00      2.21      0.60      0.00     93.25

Environment

  • Red Hat Enterprise Linux 5
  • sysstat-7.0.2-11.el5-x86_64

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