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kdump support for 2TB physical memory in Oracle Linux 6.x with UEK2/UEK3 (Doc ID 1612372.1)

Last updated on FEBRUARY 26, 2020

Applies to:

Linux OS - Version Oracle Linux 6.3 with Unbreakable Enterprise Kernel [2.6.39] and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64


With 2TB physical memory of Oracle Linux 6 with UEK2/UEK3 kernel, kdump goes into oom_kills when makedumpfile dumps multiple vmcore files in parallel (due to the fact UEK2 and UEK3 can only reserve 448M for the crashkernel), plus several hours outage for Production Server to generate vmcore files is unacceptable.

This document instructs how to configure kdump on 2TB physical memory of Oracle Linux 6 with UEK2/UEK3 kernel.

Note: This document does NOT apply for Oracle Linux 5.x.


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