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SAR Tool Not Collecting Data As Expected (Doc ID 2866685.1)

Last updated on MAY 09, 2022

Applies to:

Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0]
Linux OS - Version Oracle Linux 6.0 to Oracle Linux 7.9 [Release OL6 to OL7U9]
Linux OS - Version Oracle Linux 6.0 with Unbreakable Enterprise Kernel [2.6.32] to Oracle Linux 7.9 with Unbreakable Enterprise Kernel [5.4.17] [Release OL6 to OL7U9]
Generic Linux

Symptoms

SAR data is not available for the entire day (in Oracle Linux 7) or is corrupt in (Oracle Linux 6).

In Oracle Linux 6, full data corruption is observed:

# sar -u
Invalid system activity file: /var/log/sa/sa13

In Oracle Linux 7, partial data is provided (data prior to the Scale-Up activity is not available):

# sar -u
Linux 4.14.35-1902.306.2.10.el7uek.x86_64 (hostname) 02/13/19 _x86_64_ (6 CPU)
17:00:01  CPU  %user  %nice  %system  %iowait  %steal  %idle
17:10:01  all   0.20   0.00     0.14     0.00    0.00  99.66
(...)

Changes

Memory and CPU resources were hot-added to the system.

# journalctl -k | grep -i hot
Feb 13 16:54:26 hostname kernel: CPU4 has been hot-added
Feb 13 16:54:26 hostname kernel: Will online and init hotplugged CPU: 4
Feb 13 16:54:26 hostname kernel: CPU5 has been hot-added
Feb 13 16:54:26 hostname kernel: Will online and init hotplugged CPU: 5

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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