What is CERN Tier 0?

Each Tier is made up of several computer centres and provides a specific set of services. Between them the tiers process, store and analyse all the data from the Large Hadron Collider (LHC). Tier 0 is the CERN Data Centre.

What is tiertier 0 and where is it?

Tier 0 is the CERN Data Centre. All of the data from the LHC passes through this central hub, but it provides less than 20% of the Grid’s total computing capacity.

What is the role of cercern?

CERN is responsible for the safe keeping of the raw data (millions of digital readings from across the detectors), and performs the first pass at reconstructing the raw data into meaningful information. Tier 0 distributes the raw data and the reconstructed output to Tier 1s, and reprocesses data when the LHC is not running.

What is a Tier 2 site?

Tier 2s are typically universities and other scientific institutes that can store sufficient data and provide adequate computing power for specific analysis tasks. They handle a proportional share of the production and reconstruction of simulated events. There are around 155 Tier 2 sites around the world.