Oracle Exalytics: Are Hugepages Settings Required On An EPM Only Exalytics Machine

Asset ID:	1-71-1592131.1
Update Date:	2017-01-27
Keywords:

Solution Type Technical Instruction Sure

Solution 1592131.1 : Oracle Exalytics: Are Hugepages Settings Required On An EPM Only Exalytics Machine

Applies to:

Exalytics In-Memory Machine X2-4 - Version All Versions and later
Oracle Exalytics Software - Version 1.0.0.1.0 and later
Hyperion BI+ - Version 11.1.2.2.000 and later
Information in this document applies to any platform.

Goal

If an Exalytics system will be used for EPM applications only (without TimesTen or OBIEE), can hugepages be reconfigured?
If hugepages variables are altered, will it adversely affect EPM applications?

Solution

The hugepages parameters on Exalytics are modified during installation to allow optimal use of TimesTen. The settings are described in the Exalytics Installation Guide, see 4.5 Configuring Memory Settings on the Server.

If you will not be using TimesTen or OBIEE on this Exalytics server, it is perfectly okay to reconfigure the hugepages parameters in the /etc/sysctl.conf file to a basic default value.
The minimum value (when TimesTen is not in use) is 256 GB.
By reducing the hugepages parameter, you will have additional free memory for other applications on your Exalytics server.

For more information on this setting, please review the following references:

HugePages on Linux: What It Is... and What It Is Not <Note 361323.1>

Oracle Clusterware Installation Guide 11g Release 1 (11.1) for Linux
3.6 Overview of HugePages

Configuring HugePages for Oracle on Linux (x86-64)

Reference internal emails to exalytics_info list: http://myforums.oracle.com/jive3/thread.jspa?messageID=6975186&#6975186

References

<NOTE:1580160.1> - Oracle Exalytics How To Calculate TimesTen Memory Utilization On Exalytics Server
<NOTE:1502301.1> - How to Check Whether a System is Under Memory Pressure

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