Digital Realty Trust, Inc. Achieves “five 9s” Of Uptime For Fourth Consecutive Year

Digital Realty Trust Turn-Key DatacentersSM Provide Highly Reliable Environment for Mission Critical IT Infrastructure 

San Francisco, California and Dublin, Ireland – March 13, 2009 – Digital Realty Trust, Inc. (NYSE: DLR), the world’s largest wholesale datacenter provider, has achieved “five 9s” of uptime in its Turn-Key DatacentersSM once again with another year of 99.999 percent availability across its portfolio of facilities in North America and Europe in 2008. These uptime metrics are based on a comprehensive evaluation of the company’s Turn-Key DatacenterSM facilities in the US and Europe using standard industry methodology.

“This is a great validation of how well designed our datacenters are and how skilled our operations team is.  We have exceeded the five-9s benchmark for four straight years going back to our first year in business as a public company, and we have been able to do that while dramatically increasing the number of facilities we own and operate. Our industrialized approach has proven itself to be applicable not only in construction, but in facility operations as well,” said Ted Martin, Vice President, Technical Operations at Digital Realty Trust. “Our unique approach to planning and building Turn-Key Datacenters plays an important role in their reliability.  Equally important, however, is the intensive commissioning, maintenance processes and advanced monitoring systems through our Critical Facilities ManagementSM program that we use to test, fine tune and maintain these data centers.”

Martin added, “At many data center facilities, uptime is often highly inconsistent and may only average in the four-9s or three-9s range. That may not sound like a big difference, but that’s going from an average of less than 5 minutes of downtime for a five 9s facility to more than 500 minutes of downtime for a facility with reliability only in the three 9s range. Being in a facility that has a consistent track record of uptime is key for any mission critical data center.”

Digital Realty Trust Turn-Key DatacenterSM facilities provide state-of-the-art environments for supporting mission critical infrastructure, with advanced cooling, power, redundancy, and sustainability features to ensure that critical applications are available while optimizing energy efficiency. Digital Realty Trust’s Turn-Key DatacentersSM are scalable from hundreds of kilowatts of IT Load to megawatts of IT load and are located in markets throughout North America and Europe. Each Turn-Key DatacenterSM facility is physically secure and features a state-of-the-art power and cooling architecture that has been optimized for green operation. Every Turn-Key DatacenterSM is built using the company’s proprietary POD ArchitectureSM and uses metered power to ensure that clients pay only for the power that they use.

Only Digital Realty Trust’s Critical Facilities ManagementSM program combines the three most important elements (manpower, documentation and systems management) of successful data center operations management within a single offering. Digital Realty Trust draws upon its expertise of managing approximately two million square feet of data center space worldwide in developing this data center management solution. This high level of experience has enabled us to develop an offering that assists customers in optimizing the efficiency of their data centers to increase cost effectiveness and green operation. Unlike other providers who provide only partial monitoring and data center management solutions, Digital Realty Trust has adopted a “best-of-breed” strategy to bring the industry leading Building Management System (BMS), Security Access Control System (SACS), and Computerized Maintenance Management System (CMMS) platforms together in a single offering to provide users with the most comprehensive monitoring and control capability possible via our secure communications network.