Description
The CMS 2004 Data Challenge (DC04) was devised to test several key
aspects of the CMS Computing Model in three ways: by trying to
sustain a 25 Hz reconstruction rate at the Tier-0; by distributing
the reconstructed data to six Tier-1 Regional Centers (FNAL in US,
FZK in Germany, Lyon in France, CNAF in Italy, PIC in Spain, RAL in
UK) and handling catalogue issues; by redistributing data to Tier-2
centers for analysis. Simulated events, up to the digitization step,
were produced prior to the DC as input for the reconstruction in the
Pre-Challenge Production (PCP04).
In this paper, the model of the Tier-0 implementation used in DC04 is
described, as well as the experience gained in using the newly
developed data distribution management layer, which allowed CMS to
successfully direct the distribution of data from Tier-0 to Tier-1
sites by loosely integrating a number of available Grid components.
While developing and testing this system, CMS explored the overall
functionality and limits of each component, in any of the different
implementations which were deployed within DC04.
The role of Tier-1's is presented and discussed, from the import of
reconstructed
data from Tier-0, to the archiving on to the local mass storage
system and the data
distribution management to Tier-2's for analysis. Participating Tier-
1's differed in
available resources, set-up and configuration: a critical evalutation
of the results
and performances achieved adopting different strategies in the
organization and
management of each Tier-1 center to support CMS DC04 is presented.
Primary authors
A. Anzar
(Fermilab)
A. Chierici
(INFN-CNAF)
A. Fanfani
(INFN Bologna)
A. Nowack
(RWTH Aachen)
A. Pacheco
(PIC Barcelona)
B. Martelli
(INFN-CNAF)
C. Charlot
(Ecole Poly)
C. Grandi
(INFN-Bologna)
C. Shepherd-Themistocleous
(RAL)
D. Newbold
(RAL)
D. Stickland
(Princeton University)
F. Fanzago
(INFN Padova)
F. Martinez
(PIC Barcelona)
F. Rosso
(INFN-CNAF)
F. Ruggieri
(INFN-CNAF)
F.J. Rodriguez Calonge
(CIEMAT)
G Donivito
(INFN Bari)
G. Lo Re
(INFN & CNAF Bologna)
G. Maggi
(INFN Bari)
G. Merino
(PIC Barcelona)
G. Quast
(Karlsruhe University)
I. Fisk
(Fermilab)
I. Semeniouk
(Ecole Poly)
J. Andreeva
(CERN)
J. Hernandez
(CIEMAT Madrid)
J. Rehn
(Karlsruhe University)
K. Rabbertz
(Karlsruhe University)
L. Bauerdick
(Fermilab)
L. Dell'Agnello
(INFN-CNAF)
L. Tuura
(Northeastern University)
M. Biasotto
(INFN Legnaro)
M. Corvo
(INFN Padova)
M. Delfino
(PIC Barcelona)
M. Ernst
(DESY)
M. Mazzucato
(INFN-Padova)
M. Rodriguez
(PIC Barcelona)
N. Colino
(CIEMAT)
N. De Filippis
(INFN Bari)
N. Sinanis
(CERN)
P. Capiluppi
(INFN Bologna)
P. Garcia-Abia
(CIEMAT)
P. Mine
(Ecole Poly)
P. Ricci
(INFN-CNAF)
R. Harris
(Fermilab)
S. Fantinel
(INFN Legnaro)
S. Metson
(Bristol University)
T. Barrass
(Bristol University)
T. Wildish
(Princeton University)
W. Jank
(CERN)
Y. Wu
(Fermilab)
