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We look at the construction and design of both types and present results demonstrating that high-density DCs are a better choice for reducing the owners cost. These results apply to new construction and mostly-unconstrained retrofits. Densities of 1000 watts per square foot of work cell are being achieved with good efficiencies. Modern designs of 200 to 400 watts per square foot of work cell are much more common, but cost more. Costs of the architectural space, power systems and cooling systems are reviewed as are the operational costs for these systems. High-density DCs do cost less. The challenges for the high-density DC are also called out and suggestions for successful operation are made.

information necessary for planning the physical installation of a IBM System z10 Enterprise Class (z10 EC). It includes physical specifications, power and cooling data, cabling

Advice from Google on large distributed systems

Jul 08, Facebook released Cassandra to open source under the Apache license. Facebook uses Cassandra as email search system where, as of last summer, they had 25TB and over 100m mailboxes. This video gets into more detail on the architecture and design: http://www.new.facebook.com/video/video.php?v=540974400803#/video/video.php?v=540974400803. My notes are below...

low latency hardware based middleware and content networking

cloud services operating system that serves as the development, service hosting and service management environment

IBM mainframe listserv

Amazon elastic block storage: block level storage volumes for use with Amazon EC2 instances. Amazon EBS volumes are off-instance storage that persists independently from the life of an instance. Amazon Elastic Block Store provides highly available, highly reliable storage volumes that can be attached to a running Amazon EC2 instance and exposed as a device within the instance. Amazon EBS is particularly suited for applications that require a database, file system, or access to raw block level storage.

Top 10 database optimization tips by IBM Systems, a detailed information about DB2 optimization hints that helps to avoid errors due to changing QUERYNO.

datacenter without chillers

Cold row encapsulation for server farm cooling system

IBM System z10 Enterprise Class Installation Manual for Physical Planning GC28-6865

FICON

Heat segregation and stratification systems for high density heat load applications