Understanding the Role of the CMDB in ITIL March 5, 2007 2:00pm EST, 11:00am PST George Spafford, Principal Consultant Pepperweed Consulting, LLC “ Optimizing The Business Value of IT” www.pepperweed.com
ITIL tells us that “Configuration Management provides a logical model of the infrastructure or a service by identifying, controlling, maintaining and verifying the versions of Configuration Items (CIs) in existence.”
But what does this mean?
Configuration Management provides information about CIs to all the other processes
Think in terms of a database
The Configuration Management Database (CMDB) is the nerve center of IT
It relates all the data together, provides workflows, access to files, etc.
It can be one database or integrations into multiple sources (federated models)
The CMDB contains the data and processes that binds the ITSM processes and the organization together
The power of Configuration Management lies in relationships
Parent Relationships -- What assembled/compound CIs uses this CI as a component?
Child Relationships -- If this is an assembled/compound CI, what component CIs make it up?
RFC Records -- Need to relate this CI to all request for change made against it. This may be the same as the change record IDs but it's listed separately here. The reason is to show all RFCs -- accepted and rejected;
Change History Records -- Relate this CI to all changes made to it. This allows for the Change Manager and other stakeholders to gauge historical activity;
Problem Records -- What problems have this CI been associated with?
Incident Records -- What incidents have this CI been associated with?
… and whatever else is needed for Service Level Management, Capacity Management, Security, IT Service Continuity Management and so on. The more you add the more complex the data model becomes
A complex system that is difficult to update will not be used and/or errors will creep in
If the system is out of date, then the data is out of date so people use it less as the system of record and the data gets further out of date and people use it less and …
The downward spiral begins
Your design must be meaningful and manageable
Capture what you need – not what you can
CMDB Tooling Notice we discussed processes first! Tools come after process definitions not before.
Because the CMDB is a logical model of your infrastructure and will be used to support your people, processes and technology, you must formally identify requirements prior to either buying or building it.
British Educational Communications and Technology Agency (BECTA) http://www.becta.org.uk/tsas
IT Process Institute’s Visible Ops Methodology http://www.itpi.org
PMI Project Management Body of Knowledge http://www.pmi.org
Projects in Controlled Environments version 2 (PRINCE2) http://www.prince2.org.uk/web/site/home/Home.asp
Thank you for the privilege of facilitating this webcast George Spafford Principal Consultant Pepperweed Consulting Optimizing the Value of IT [email_address] http://www.pepperweed.com Daily News Archive and Subscription Instructions http://www.spaffordconsulting.com/dailynews.html