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32 vFoglight

Getting Started Guide

In this collection model instance, a host is represented by a node. It has three child

nodes, which represent the CPU, memory, and disk of the host. The CPU and disk nodes

also have child nodes that represent the individual processors and file systems,

respectively.

The monitoring data that populates this collection model instance is a mix of

configuration data (host name, OS, patch level, CPU brand, clock speed, amount of

memory) and metrics (CPU usage, allocated memory). Each piece of data is stored only

once, but no context is lost. You can know the host name from the CPU or memory

nodes, even though the host name is not stored along with the CPU or memory

information. Metric data is also stored as part of the context. For example, if there are

two hosts, the CPU usage for Host A would be stored with the Host A instance.

What is truly innovative about vFoglight is that these models can be built for any

domain at any time. A model instance can be built at the click of a button in the browser

interface (using the service builder or application builder), or as a result of new data

arriving in the vFoglight Management Server. vFoglight models have been built for

multiple domains, including Java, .NET, database, and custom applications (Siebel,

PeopleSoft, Oracle E-Business). More importantly, models can be built that represent

anything in your monitored environment—your organizational structure, the physical

layout of your server room, or the geographical distribution of your data centers.

Once built, the artifacts that are part of a model are packaged into a cartridge (a .car file)

and installed on the vFoglight Management Server.

Services

In the context of vFoglight, a service can be any component or group of components

that you want to monitor. Typically, a service is a grouping of meaningful or interesting

things. Some services are created automatically—for example, for monitored hosts—

but most services are created by you to reflect what you find interesting and are

responsible for monitoring. Examples of services include:

• An application, including its web servers, application servers, and databases.

• A collection of related systems, such as all Windows machines in your monitored

environment.

• A business process, such as retail banking.

A service is often governed by a Service Level Agreement (SLA).

vFoglight allows you to define a new service; you can also make changes to existing

services, such as renaming a service while preserving the history for that service.

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