The objective of the MONARC project is to identify baseline computing model
s that could provide viable solutions meeting the data analysis needs of th
e LHC experiments. A powerful and flexible set of simulation tools has been
developed to model the performance of distributed computing resources for
a set of reconstruction and analysis tasks. In this paper we report the val
idation of the simulation tools using the testbed environments with Objecti
vity/DB over LAN and WAN connections. A simple and effective way to paramet
erize and evaluate the concurrent database access over network has been est
ablished. (C) 2001 Elsevier Science B.V. All rights reserved.