Disable NUMA on database servers to improve performance of Linux file system utilities (Doc ID 1053332.1)

Last updated on DECEMBER 07, 2015

Applies to:

Oracle Exadata Hardware - Version 11.2.0.1 and later
Linux x86-64
***Checked for relevance on 24-Oct-2013***

Symptoms

NUMA memory imbalance conditions result in severe performance loss for commands that operate on files in file systems residing on the internal drives of the database servers on Sun Oracle Database Machine.

The primary symptom is severe performance degradation suffered by coreutils tools such as cp(1), dd(1), tar(1). Other tools such as gzip are affected as well. System response as a whole may also be impacted.  The loss of performance is significant when using large files. 

Note: Exception: X2-8 and X3-8 Database servers should have NUMA on

Note: On Exadata X5-2 is enabled by default.

Changes

Symptoms occur when reading or writing a large amount of data, without direct I/O, on Ext3 file systems on NUMA enabled database servers in Sun Oracle Database Machine.

Cause

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