The "ELM 411" - Dissecting the Relationship Between Monitoring & Agent Category Assignment and Hierarchy Considerations
ELM provides excellent flexibility and power for monitoring the systems in your environment. But before you dive in too deep it is a good idea to take a step back and understand the use of Agent Categories when assigning monitor items and the default hierarchy that exists. This will help you to plan for your deployment or fine tune your existing configuration. Let’s start from the top.
ELM provides a global or universal category called All Agents. This is the one Agent Category within the product that you cannot modify. Within this Category you will see a list of all the Agents currently deployed throughout your environment. You can setup a monitoring template here to monitor across all of your Agents but keep in mind settings within this category are global or universal, so whatever monitoring you configure will be applied to all of your existing Agents as well as any new Agents you create in the future. A good example of monitor items that could be universally applied is the Ping Monitor, or TCP Port Monitor. This status based monitoring is generic enough it supports being applied universally across Agents running on either systems or devices.
Below All Agents you will see that right "out-of-the-box" ELM provides a number of default Categories to group your Agents quickly. These Categories include:
- General - Network Device Monitoring
- General - SNMP Monitoring
- General - Web Monitoring
- MS - DNS Server Systems
- MS - Exchange Server Systems
- MS - IIS Server Systems
- MS - MSMQ Server Systems
- MS - SQL Server Systems
- Windows - Domain Controllers
- Windows - Servers
- Windows - Workstations
You can assign Agents to these specific categories to perform focused monitoring functions across groups of servers. For example, you may want to monitor your Domain Controllers differently than your Windows Servers. ELM also allows you to create your own custom Categories and easy-to-use wizards walk you through customizing your own Agent groupings.
A common question when working with Categories is: "Can I assign monitoring to just one server?" The answer is "Yes" ELM supports granular monitoring assignments allowing you to assign a single Monitor Item to a single Agent. Using the Monitor Items folder beneath an Agent allows you to assign monitoring to a single system. This is helpful if you are looking at specific issues such as performance or events that are only relevant to that specific server. Best practice would be to ignore categories and assign monitor items to just one server as opposed to a category or to All Agents.
Each system or Agent can be assigned to more than one category as you deem appropriate and no category has higher priority or trumps the others. But remember, the All Agents category will supersede all other categories and only universal or global settings should be applied at this level. For more information on Agent Categories, we encourage you to view the ELM On-Line Help Guide. Here you'll find more detailed information about Category Assignment and Agent Assignment.
Thank you for your interest and we wish you continued success with your ELM deployment. If we can be of service with your ELM setup or configuration in any way we welcome your call!
NOTE: All ELM 411 articles are written based on Version 5.0 and instructions may not be accurate for previous ELM Versions. If you would like assistance upgrading to Version 5.0 so you can use these tips - please contact support@tntsoftware.com.
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