ODA Default OS Console Loglevel Change in /proc/sys/kernel from [ 4 4 1 7 ] to [ 10 4 1 7 ] Increasing Printed Messages Into the Kernel Logs Impacting Performance
(Doc ID 2376989.1)
Last updated on SEPTEMBER 01, 2023
Applies to:
Oracle Database Appliance X4-2 - Version All Versions to All Versions [Release All Releases]Oracle Database Appliance X7-2 HA Hardware - Version All Versions and later
Information in this document applies to any platform.
Symptoms
NOTE: This problem is Linux OS generic.
While this example will discuss the ODA, the symptoms are possible on most any Linux configuration.
The more servers and devices, the more potential for excessive overhead and performance impact due to this logging.
Example
- A highly populated ODA Farm with several ODA HAs encountered multiple hosts rebooted at same time.
- The problem appeared to be isolated to ODAs using one subnet.
- In fact, most ODAs impacted only would see the problem on one of the two Nodes.
- The problem required higher than normal loads.
- However, other systems that appeared to have similar loads were not impacted.
- One unusual symptom:
Only one of the two nodes in the ODA cluster would see the reboot.
The second node was unaffected and the problem node was added back to the cluster without user intervention.
Changes
The problem only happened after an upgrade of their several ODAs to 12.1.2.8 and higher.
Initial assessment of several ODA hardware versions from 12.1.2.7 to 12.1.2.12 almost all included non-default settings which appear to be introduced as part of the patching.
Cause
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