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2020-09-08 - Incorrect vm.min_free_kbytes kernel parameter can cause ORA-27301 error

  • Updated
  • Products: FlashGrid Cluster on Azure
  • Products: FlashGrid Cluster on GCP
  • Products: FlashGrid Storage Fabric
  • Products: FlashGrid Cluster on AWS

All customers are recommended to apply the fix.

Summary: Reserved kernel memory amount vm.min_free_kbytes may be set incorrectly. As a result, Oracle Database may report ORA-27301: OS failure message: No buffer space available error with disruption to the database operation.

Symptoms:

  • ORA-27301: OS failure message: No buffer space available error reported by the database
  • On database nodes sysctl -a | grep vm.min_free_kbytes returns value of 524288, which is a default value from /etc/sysctl.d/50-flashgrid.conf. On database nodes it should return a larger value.

Affected products:

  • FlashGrid Storage Fabric
  • FlashGrid cluster for Azure/AWS/GCP

Affected versions:

flashgrid-sf RPM versions 19.5.x through 19.6.432

Root Cause:

The issue will happen if kernel parameters are re-loaded manually after system boot. Also, on Azure it may be triggered by WALinux agent.

Resolution:

Upgrade flashgrid-sf RPM to the version 19.6.448 or newer on all nodes

Note: Need to reboot each node after the RPM upgrade

References:

The RPM update procedure must follow the recommended steps described in the knowledge base articles: