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The results of the project which is focused on the development and design of tools for grid and cloud services simulation are shown in the paper. The simulation is needed for efficient optimization of complex distributed data processing systems of scientific experiments.

A new grid and cloud services simulation system has been developed in LIT JINR. This system is focused on improving the efficiency of the grid-cloud systems development by using work quality indicators of some real system to design and predict its evolution. For these purposes the simulation program is combined with real monitoring system of the grid-cloud service through a special database.

An example of the program usage to simulate a Tier 1 data storage system is given.

 [8] GridSim web-portal: URL:http://www.gridbus.org/gridsim/, 2012 [9] D. Klusacek , L. Matyska , and H. Rudova . Alea - Grid scheduling simulation environment// In 7th International Conference on Parallel Processing and Applied Mathematics (PPAM 2007 ), volume 4967 of LNCS , pages 1029 - 1038 . Springer, 2008 . " > grid' : 642 . [12] Maeno T. , De K. , Panitkin S. PD2P: PanDA Dynamic Data Placement for ATLAS // For the ATLAS Collaboration . - 7 [13] JDBC Overview http://www.oracle.com/technetwork/java/overvie w- 141217 .html [14] The Worldwide LHC Computing Grid . http://home.web.cern.ch