Valencia Analysis Facility infrastructure (Tier2 & Tier3) for ATLAS experiment

Santiago Gonzalez DE LA HOZ
IFIC Valencia

In the ATLAS computing model the tiered hierarchy ranged from the Tier-0
(CERN) down to desktops or workstations (Tier-3). The focus on defining
the roles of each  tiered component has evolved with
the initial emphasis on the Tier-0 and Tier-1 definition and roles. The
various LHC (Large Hadron Collider) projects, including ATLAS, then
evolved the tiered hierarchy to include Tier-2.s (Regional centers) as
part of their projects. Tier-3 centres, on the other hand, have been
defined as whatever an institution could construct to support their
Physics goals using institutional and otherwise leveraged resources and
therefore have not been considered to be part of the official ATLAS
computing  resources. However, Tier-3 centres are going to exist and will
have implications on how the computing model should support ATLAS
physicists. Tier-3 users will want to access LHC data and simulations and
will want to enable their resources to support their analysis and
simulation work. In this talk  will discuss how IFIC
(Instituto de Fisica Corpuscular deValencia), after discussing with the
ATLAS Tier-3 task force, should interact with the ATLAS computing
model, detail the conditions under which Tier-3 centres can expect some
level of support and set reasonable expectations for the scope and support
of ATLAS Tier-3 sites.