Potential data center customers often ask data center operators if they are “PCI Compliant.” There has been some confusion surrounding the answer to this question. Data center providers normally do not have anything to do with their customer’s sensitive information handling procedures. To clarify and answer the PCI question, let’s discuss the responsibilities of the data center and the responsibilities of the merchant or service provider (data center customer).

What exactly is PCI compliance?

http://www.datacenterknowledge.com/archives/2010/04/06/pci-compliance-who-manages-what/