Exalogic: Machine Exception Log (/var/log/mcelog) Grows Rapidly When Hardware Fault Is Present Filling Root Filesystem (Doc ID 2358170.1)

Last updated on JANUARY 17, 2022

Applies to:

Symptoms

You have an Exalogic rack where you have experience a hardware fault (for example, a faulty DIMM) and as a result you have encountered a secondary issue where the Machine Check Exception log file (/var/log/mcelog) is growing at a very fast rate (>1Gb a minute) and, if not periodically cleared manually (by running: cat /dev/null > /var/log/mcelog), can cause the root file system to fill to 100% very quickly, resulting in additional problems for the affected compute node.

This issue can happen both on Exalogic Linux Physical Compute Node and Exalogic Virtual Dom0 Compute Nodes.

Changes

This problem manifests only when a hardware fault is present in the system.

Cause

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