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Foglight for DB2 (Cartridge) 7.1.0 - Hardware Sizing Guide

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Recommended Hardware Settings for Running Foglight for DB2 LUW

Parameters Used for Hardware Sizing Determining Requirements

Determining the Size of the Monitored Environment Number of Foglight for DB2 LUW Agents Per Agent Manager Number of Foglight for DB2 LUW Agents Per Management Server

Number of Files Opened on the Agent Manager Server

Number of Foglight for DB2 LUW Agents Per Agent Manager

The number of agents that can be hosted on an Agent Manager depends on the size of the environment and the amount of memory allocated on an Agent Manager. Instances, databases, and members each count toward the number of agents. For example, one instance with two databases and two members counts as five agents (1+2+2=5). If you require more agents than can be supported by one Agent Manager, add additional Agent Managers.


Environment Size	Number of agents
Environment Size	Agent Manager with 256MB memory	Agent Manager with 1GB memory
Small	25	90
Medium	10	70
Large	5	40

Number of Foglight for DB2 LUW Agents Per Management Server

The number of agents that can be hosted on a Management Server depends on the size of the environment and the amount of memory allocated for the Management Server. If you require more agents than can be supported by one Management Server, add additional Management Servers.


Environment Size	Number of agents
Environment Size	Management Server with 4GB memory¹	Management Server with 8GB memory
Small	250	500
Medium	200	400
Large	150	250

1

4GB is the default memory allocation.

NOTE: Use the Foglight for DB2 LUW installer to ensure that the default Repository type is set to Oracle/SQL Server.

Number of Files Opened on the Agent Manager Server

While monitoring DB2 instances, Foglight for DB2 LUW agents pass file descriptors to the kernel on the Agent Manager server to request that files be opened. For your reference, the following table states the number of files that are open while monitoring one DB2 instance. The numbers vary based on the operating systems used to host the Agent Manager and to host the DB2 instance. The last column shows how many files are opened when agents are added to monitor additional DB2 instances.


OS Hosting Agent Manager	OS Hosting DB2 Instance	DB	OS	IC	Total	Files per Agent Added
UNIX/Linux	UNIX/Linux	232	2	1	235	~6
UNIX/Linux	Windows	203	0	1	204	~8
Windows	UNIX/Linux	320	11	1	332	~25
Windows	Windows	161	0	1	162	~2

Abbreviations used in the table:

•

DB = DB2 Database Instance

•

OS = Operating System

•

IC = Infrastructure Cartridge

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