A design report was published in 2005. It was announced to be ready for data on 3 October 2008. A popular 2008 press article predicted "the internet could soon be made obsolete" by its technology. CERN had to publish its own articles trying to clear up the confusion. It incorporates both private
fiber-optic cable links and existing high-speed portions of the public
Internet. At the end of 2010, the Grid consisted of some 200,000 processing cores and 150
petabytes of disk space, distributed across 34 countries. The data stream from the detectors provides approximately 300
GByte/s of data, which after filtering for "interesting events", results in a data stream of about 300
MByte/s. The CERN computer center, considered "Tier 0" of the LHC Computing Grid, has a dedicated 10
Gbit/s connection to the counting room. The project was expected to generate multiple
TB of raw data and event summary data, which represents the output of calculations done by the
CPU farm at the CERN data center. This data is sent out from CERN to thirteen Tier 1 academic institutions in Europe, Asia, and North America, via dedicated links with 10 Gbit/s or higher of bandwidth. This is called the LHC Optical Private Network. More than 150 Tier 2 institutions are connected to the Tier 1 institutions by general-purpose
national research and education networks. The data produced by the LHC on all of its distributed computing grid is expected to add up to 200
PB of data each year. In total, the four main detectors at the LHC produced 13 petabytes of data in 2010. In 2015, CERN switched away from
Scientific Linux to CentOS.
Distributed computing resources for analysis by end-user physicists are provided by multiple federations across the Europe, Asia Pacific and the Americas. ==See also==