1. LHCb Bologna Workshop 14.06.01 Glenn Patrick1 Backbone Analysis Grid A Skeleton for LHCb? LHCb Grid Meeting Bologna, 14th June 2001 Glenn Patrick (RAL) http://hepwww.rl.ac.uk/lhcb/physics/bologna140601.ppt

2. LHCb Bologna Workshop 14.06.01 Glenn Patrick2 MPG Monte-Carlo Production Grid Monte-Carlo Production is readily mapped onto a Grid Architecture because: It is a well defined problem using the same executable. Already requires distributed resources (mainly cpu) in large centres (eg. Lyon, RAL, Liverpool...). Few people involved. With Erics help, we all learnt a lot from the mini project between CERN, RAL, Liverpool et al. Particularly:What worked, what didnt work, what was hype,the Grid products we need to wait for.

3. LHCb Bologna Workshop 14.06.01 Glenn Patrick3 RAL CSF 120 Linux cpu IBM 3494 tape robot LIVERPOOL MAP 300 Linux cpu CERN pcrd25.cern.ch lxplus009.cern.ch RAL (PPD) Bristol Imperial College Oxford GLASGOW/ EDINBURGH Proto-Tier 2 Initial LHCb MPG Testbed Institutes Exists Planned RAL DataGrid Testbed Cambridge First lesson! Not much of this worked at the same time for all people.

4. LHCb Bologna Workshop 14.06.01 Glenn Patrick4 BAG Backbone Analysis Grid Analysis is much more inventive, chaotic and apparently controversial. It will involve far more people in a wide range of institutes. We need to get a feel for the issues. We need to be realistic. Gaudi will need a skeleton testbed to develop any Grid services. We need a basic Grid structure to try things out (and be able to get them wrong as well as right!).

5. LHCb Bologna Workshop 14.06.01 Glenn Patrick5 I typed my Grid ID into the wrong box and accidentally booked us into 90543678910 hotel rooms!

6. LHCb Bologna Workshop 14.06.01 Glenn Patrick6 Gaudi meets BAG? Gaudi Services Application Manager Job Options Service Detector Description EventData Service Histogram Service Message Service Particle Property Service GaudiLab Service Meta Data Data Standard Interfaces & Protocols Logical DataStores Event Detector Histogram Ntuple UK? ITALY? FRANCE? ?? CERN ??

7. DataGrid Testbed Sites Dubna Moscow RAL Lund Lisboa Santander Madrid Valencia Barcelona Paris Berlin Lyon Grenoble Marseille Brno Prague Torino Milano BO-CNAF PD-LNL Pisa Roma Catania ESRIN CERN HEP sites ESA sites IPSL Estec KNMI (>40) BAG is a small subset of this

8. LHC Computing Model CERN Tier2 Lab a Uni a Lab c Uni n Lab m Lab b Uni b Uni y Uni x Physics Department Desktop Tier 1 USA FermiLab UK France Italy NL Germany USA Brookhaven ……….

9. LHCb Bologna Workshop 14.06.01 Glenn Patrick9 Focus for other Centres Tier 2 (eg. Liverpool) Tier 3 Tier 2 (eg. Edin./Glasgow) UK BAG Node (eg. RAL) Possible UK Example

10. LHCb Bologna Workshop 14.06.01 Glenn Patrick10 Requirements and Aims Select a v.small number of sites (to begin with). Grid-enabled with standard Globus kit, GSI-ftp, etc. LHCb software installed in ~ standard environment. Replicated datasets installed at each site (small, disk resident to start with). Authorisation/authentication for outsiders. Provides mini-grid to explore distributed analysis. New LHCb Grid staff (eg. Oxford WP8 post) can help to develop and exploit this infrastructure. See what works before worrying about the larger-scale!

11. LHCb Bologna Workshop 14.06.01 Glenn Patrick11 Conclusions BAG could provide: 1.Better understanding of how a distributed Data Model would really work for analysis. Test different models. 2. A (skeleton) testbed for developers. 3. Experience of running Gaudi in a distributed LHCb environment. Performance/limitations? 4. Better understanding of technical issues. 5.Pull together some of the wider Grid work for benefit of LHCb. 6.Useful structure for funding/manpower requests?