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EM: How Memory Utilization (%) is Calculated for Linux Hosts Monitored via Enterprise Manager Grid Control (Doc ID 730104.1)

Last updated on FEBRUARY 18, 2019

Applies to:

Enterprise Manager Base Platform - Version 10.2.0.5 to 11.1.0.1 [Release 10.2 to 11.1]
Generic Linux

Purpose

This document explains the issues related to Memory Utilization Index (MUI) calculation for Linux Hosts, monitored in Enterprise Manager (EM) 10g or 11g Grid Control.

When using Grid Console to monitor a Linux host, the Memory Utilization Index (%) (MUI) mostly reports usage around 95%, even if the server is not very busy.

The values shown by the metric do not match the output from the OS level 'free' command.

Due to the high values reported, alerts are raised for this metric even if the memory usage is not high on the machine. Increasing the thresholds for this metric does not help, as the value can be around
95% or more always.

Note: The issue discussed in this document is applicable only to Memory Utilization Index (%) (MUI) Metric on the Linux Platforms.

 

Scope

EM 10g or 11g Grid Control users who are monitoring the Memory Utilization of Linux hosts.

 

See the following document for information on the Memory Utilization (%) metric calculation in EM 12c and 13c Cloud Control:

<Note 1908853.1> The Host Memory Utilization Percentage Calculation in Enterprise Manager Cloud Control

 

Details

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In this Document
Purpose
Scope
Details
 Default calculation of Memory Utilization (without any patches)
 Calculation of Memory Utilization with Patch 5336607
 Calculation of Memory Utilization with Patch 6488223      The above formula was further modified in Bug - MEMORY USAGE THRESHOLD IN LINUX
<Internal_Only>Bug 6488223 MEMORY USAGE THRESHOLD IN LINUX  </Internal_Only>
          
The one-off Patch  6488223  is available on 10.2.0.4 Agent versions on Linux x86, Linux x86-64
and on 10.2.0.3 for IBM Power Based Linux.
References

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