Você pode conferir a Wikipedia no Centro de Dados e Data Warehouse
A data center or datacenter (or datacentre), also called a server farm,1 is a facility used to house computer systems and associated components, such as telecommunications and storage systems.
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Data warehouse is a repository of an organization's electronically stored data. Data warehouses are designed to facilitate reporting and analysis
Além disso, um Data Warehouse pode hospedar muitos Data Marts
A data mart is a subset of an organizational data store, usually oriented to a specific purpose or major data subject, that may be distributed to support business needs.
Assim, pode haver um ou mais Data Marts , que existam em um Data Warehouse hospedado em um Data Center que possa conter mais de um Data Warehouse e outros serviços.