Speaker
Report on the experience (or the proposed activity). It would be very important to mention key services which are essential for the success of your activity on the EGEE infrastructure.
This talk will describe the replica implementation of LHCb LFC database that is
foreseen to be done to each LHCb Tier-1 site. The LFC database replication is
realized by means of Oracle Streams technology, a high-speed tool that allows
synchronization and full consistency of replicated database. The streams technology
takes care of propagating information from one database to another. In order to
verify the requirements asked by the LHCb Collaboration a series of tests have been
performed. The tests are designed to evaluate performances, delay on the propagation
of the streams and the scalability of LFC. The tests show the robustness of the
replica implementation with performance going beyond the experiment's requirements.
In our tests we also took into account these issues verifying the ability of the LFC
to retry a connection if the Oracle server becomes unavailable, as well as the
ability of the LHCb applications to choose an LFC replica and if this replica fails.
With a forward look to future evolution, discuss the issues you have encountered (or that you expect) in using the EGEE infrastructure. Wherever possible, point out the experience limitations (both in terms of existing services or missing functionality)
The LHCb LFC replica implementation will allow to the LHCb users to perform data
analysis with high performance, scalability and fault tolerance. This results of this
experience will be useful for many other EGEE applications based on Oracle databases.
Applications need to be aware of the underlying replicated environment in order to
take advantage of the added fault tolerance and scalability.
Describe the added value of the Grid for the scientific/technical activity you (plan to) do on the Grid. This should include the scale of the activity and of the potential user community and the relevance for other scientific or business applications
Scientific data intensive applications use a large collections of files for storing
data. In particular, as regards the HEP community, data generated by large detectors
will be managed and stored using databases. The intensive access to information
stored in databases by the Grid computing applications requires a distributed
database replication in order to guarantee the scalability and, in case of failure,
redundancy. Besides the results of the tests will be an important reference for all
the Grid users.
Describe the scientific/technical community and the scientific/technical activity using (planning to use) the EGEE infrastructure. A high-level description is needed (neither a detailed specialist report nor a list of references).
The presentation will describe the architecture and the deployment of the LHCb read
only File Catalog for the LHC Computing Grid (LFC) replica implemented at the Italian
INFN National Center for Telematics and Informatics (CNAF) and evaluates a series of
tests on the LFC with replica. The LHCb computing model foresees the replication of
the central LFC database in every Tier-1, in order to assure more scalability and
fault tolerance to LHCb applications.
