Services

A CA Spectrum service is a model that represents some logical business service. For example, a router model represents the status of physical device similarly, a service model represents status of the business service.
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A CA Spectrum service is a model that represents some logical business service. For example, a router model represents the status of physical device similarly, a service model represents status of the business service.
A service model contains a set of resources and a policy indicating the behavior of resources. Service resources are other CA Spectrum models which collectively provide or support the availability of a business service. A service is only available when its resources are available. In turn the service model monitors the availability of its resources to determine its health or availability. By applying the collective resource availability to its service policy, the service model can depict the real-time health of the business service it represents.
A service model differs from other types of models in CA Spectrum. To confirm this information, perform the following actions:
  • Consider some of the patterns that are common in IT management. For example, redundant devices, hot swap back ups, load balanced servers, clustered or pooled resources.
  • Verify how these patterns are used to support specific business services. One of the oldest and most common business services is DNS. The critical nature of DNS lets you deploy multiple DNS servers. DNS improves performance and also mitigates the risk of DNS failure.
  • Represent the real-time status of the DNS service in an environment with two servers that are dedicated to DNS. Monitor the servers themselves as host models in CA Spectrum. The host model lets you understand the situation if contact is lost to the server and provides information about a number of other potential system faults. You can create SPM tests to validate that each server is responsive. You can also monitor critical processes or file systems on the servers.
Availability of DNS
DNS is available when both servers are functioning. If one of the servers is down, DNS is still available. However, DNS is not available when both the servers are down. The host models, SPM tests, monitored processes, and file systems are all individual models, any of which can fail and produce an alarm. You can view alarms to determine the availability of DNS which can become complex and error prone with this small set of models.
You can manage this complexity using CA Spectrum Service Manager. Using service models, you can organize the host models, SPM tests, processes, and file systems to represent the DNS service and express the availability of that service.
The following diagram illustrates the process to implement DNS in CA Spectrum Service Manager.
 
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