You can move forward even if you don’t want a complete CMDB/CMS
Once you have identified what foundational data sources you have available to work with, you should put together a separate initiative that targets their clean up and consolidating; retiring duplicate or no longer necessary sources. Even if you don’t move forward with a comprehensive configuration management effort, this data cleanup and deduplication initiative will be tremendously beneficial especially when you do start to move forward with a CMDB/CMS later on.
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