Speaker
Mikhail Titov
(Moscow Physical Engineering Inst. (MePhI))
Description
There is ATLAS wide policy how different types of data is distributed between centers of different level (T0/T1/Tn) it is well defined and centrally operated activity (uses Atlas Central Services which include Catalogue services, Sites services, T0 services, Panda Services and etc). At the same ATLAS Operations Group designed user oriented services to allow ATLAS physicists to place data replication request and using Distributed Data Management (DDM) as a low level distribute data between more than 70 sites.
The DDM System consists of a bookkeeping system (dataset-based) and a set of local site services to handle data transfers, building upon Grid technologies. The software stack is called DQ2 [1].
So replication methods for physicist’s requests include DQ2 service, DQ2 End-User tools [2], Web-based interface for user’s requests (which is using internally DQ2 service) [3] and for replication control uses DDM/DQ2 data transfer monitoring. These methods supplement each other, because all of them are having some restrictions and policies, which are defined by ATLAS Operations Group or corresponding cloud coordinators.
[1] https://twiki.cern.ch/twiki/bin/view/Atlas/DistributedDataManagement
[2] https://twiki.cern.ch/twiki/bin/view/Atlas/DDMEndUserTutorial
[3] http://panda.atlascomp.org?mode=reqsubs0
Author
Mikhail Titov
(Moscow Physical Engineering Inst. (MePhI))
Co-author
Alexei Klimentov
(Brookhaven National Laboratory (BNL))
