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HP datacentre, Sydney
HP's latest datacentre is built on 13.4ha of land out in Western Sydney. Currently under construction, it has been designed from the ground up, in the form of three separate shells that are able to operate independently of each other.
Each cell provides a space of 2000m2 for racks in a hot-aisle configuration, and an additional 500m2 of raised floor space.
The majority of racks in the first cell run on a concrete slab (pictured). Hot air is exhausted out, into the aisles.
READ MORE: HP opens Sydney datacentre: photos
Rackspace's Slough-based datacentre houses the hardware for its UK cloud, along with the other servers rented by its customers. It has 1,600 racks in place, of which 120 support its cloud.
The datacentre, in operation since June 2008, was in the process of being expanded when ZDNet visited in 2011, with the company adding a further data hall. At the same time, Rackspace is bringing in new cooling systems to increase the efficiency of the site and cut its power costs.
Rackspace's server hardware is predominantly supplied by Dell. It operates a multi-vendor networking approach: Cisco is the predominant provider of switching technology, while Juniper Networks supplies backbone services and Brocade provides equipment for load balancing.
TAKE THE TOUR: Inside Rackspace's UK cloud datacentre
Image: Jack Clark
Barcelona Supercomputing Centre
Perhaps the datacentre with the most impressive home of all is housed at the Barcelona Supercomputing Centre.
Located amid the colonnades and Romanesque arches of the Torre Girona chapel, MareNostrum is one of the fastest supercomputers in the world.
No longer a place of worship, today the chapel is the site of supercomputing research into computer, Earth and life sciences. The machine has 10,240 IBM Power PC 970MP processors that have a combined peak performance of 94.21 teraflops.
Image: Barcelona Supercomputing Centre