The PDMC – Service Configuration Tier

The Practical Data Model for CMDB is a common information model for IT service management CMDB solutions created by Justin Group Oy. The Practical Data Model for CMDB will be published in December 2019 under creative commons license which allows actors in the ITSM community to utilize it for different purposes.

This blog series will introduce the three primary tiers of the model.

The Practical Data Model for CMDB – Service Configuration Tier [Blog 3/3]

In my previous blog, I introduced customer facing service and backend service CI domains on the Service Tier. This time we are focusing on the Service Configuration Tier of the Practical Data Model for CMDB (PDMC), which contains all infrastructure CI domains. Depending on service provider organization needs, the content of this tier may vary a lot. From the CMDB architect’s point of view, the list of options and choices is endless. Successful CMDB scope definition requires that the organization is aware of its requirements and has a realistic understanding of its information management capabilities.

All tiers

Identifying correct CI domains

Selection of correct CI domain scope for the CMDB is always a challenging task, and especially in the Service Configuration Tier. This tier contains a significant amount of possible CI domains and depending on the needs of the service provider, the correct combination of the CI domains may vary.

The most common CI domains in the CMDB implementation scope are business applications, end user devices, printing and server capacity. Application servers, databases, connectivity, load balancing, etc. are desirable domains as well, but quite often they are considered being more challenging areas to implement. However, all previously mentioned CI domains are average selections and each service provider must make their own decision based on their maturity level, available data sources, business requirements and available resources.

Service Configuration Tier - UML


When people are talking about a CMDB, they are often referring to the CIs in the Service Configuration Tier. Business services and processes, as well as customer facing services, are dependent on these service configuration items. On the other hand, the CIs in the Service Configuration Tier depend on the backend services that maintain and operate them. CI relationships are describing the nature, purpose and impact of the dependencies between different CI domains.

All classes highlighted

And now you can just wait…

This was the last of three blogs about the Practical Data Model for CMDB model, which will be published in December 2019. The Practical Data Model for CMDB will be available as a free download and includes pre-defined CI class diagrams for all three primary tiers and their domains.

More information:

Julkaistu 18.12.2019

Aki Lähteenmäki

CPO | Co-Founder +358 50 5066 806 Read more

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