JLDG is a data-grid infrastructure for Lattice QCD (LQCD) community in Japan. Several large LQCD collaborations in Japan have been working on QCD simulations using super-computers. Outputs of simulations called "QCD configurations" are valuable, because physicists can study various aspects of QCD using these configurations. JLDG enables the community to share configurations distributed over distant sites. File sharing is realized with GFarm global file system. GSI authentication is managed by VOMS. JLDG utilizes the HEPnet-J/sc private network as a hardware infrastructure. Part of configurations can be accessed from all over the world through the ILDG interface.
ILDG is an international project to develop a grid of datagrids for sharing lattice QCD configurations world-wide. Design of QCD configuration markup language was finished in 2004. WSDL definition of interface among collaborating grids was also completed recently. Construction of regional grids is finalized in US, UK, Germany, Australia and Japan. (JLDG works as the ILDG Japan grid.) Inter-operation of these local grids started in July 2007.
LQA is a database of QCD configurations provided and maintained by the center for Computational Sciences (CCS) since Dec.2003. The Archive currently stores
You can use ILDG standard interface to search ensembles (sets of configurations with common physics parameters) and configurations and to download configurations, or use interactive Web interface.
HEPnet-J/sc is a Japanese domestic network for theoretical high energy physics. It utilizes SuperSINET 1Gbps private network connections operated by NII. Major LQCD sites in Japan are connected. HEPnet-J/sc started as a collection of NAS storages and a file mirroring system among them for Japanese Lattice QCD collaborations distributed over 6 sites. Storages connected to the HEPnet-J/sc amount to 60TB. The HEPnet-J/sc will be dissolved and absorbed into JLDG.
Last update: 12 May 2008, T.Yoshie