Grid activities in the Czech Republic Jiří Kosina, Miloš Lokajíček, Jan Švec Institute of...

Grid activities in the Czech Republic

Jiří Kosina, Miloš Lokajíček, Jan Švec

Institute of Physics of the Academy

of Sciences of the Czech Republic

http://www.fzu.cz/

HEP Experiments in the Czech Republic (1)

● D0, STAR, ATLAS and ALICE (main experiments only) computing activities:– detector simulations, reconstruction– data analysis in running projects - main participants are

● Institutions – Institute of Physics AS CR, Institute of Nuclear Physics

AS CR – Charles University in Prague – Czech Technical University in Prague

● Facilities – EDG test-bed now being converted to LCG

Institutions involved in the Grid activities

● CESNET (http://www.cesnet.cz/)● Charles University in Prague (http://www.cuni.cz/)

● Czech Technical University in Prague (http://www.cvut.cz/)

● Institute of Physics AS CR (http://www.fzu.cz/)

CESNET(1)

CESNET z.s.p.o.

● association of legal entities created by Czech universities and Academy of Sciences of the CR

● Czech scientific network provider

– shareholder of the Dante

– member of TERENA

– Internet2 international partner

● Computing and networking strategic research projects

– Optical networks and their development

– IPv6 implementation in the CESNET2 network

– Multimedia transfers

– MetaCenter

– Voice services in the CESNET2 network

– QoS in high-speed networks

CESNET(2)

● International projects– GEANT – DataGrid -> EGEE– SCAMPI – 6NET

● Other projects– Infrastructure and technology for on-line education ,

Distributed contact center , Smart NetFlow analyser , Storage over IP , Presentation , RT system in CESNET, Securing CESNET2 local networks , Time synchronization and NTP servers, Platforms for video transmission and production, MEDIMED

CESNET(3)

● 1.2Gbps connection to GEANT (over HW 10 Gbps)● 1+1Gbps connection to NIX (Peering with Czech

ISPs)● 800Mbps connection to USA (Telia)● 2.5 Gbps CzechLight connection (now used for

other tests)– Reserved optical connection 1 Gbps

Institute of Physics <-> CERN – Connected to our linux router, switching to “backup” line

through Internet managed by BGP protocol– Possibility to connect to StarLight in the future

CESNET(4)

● European DataGrid project – WP1 workload management – WP7 network monitoring– Certification authority established for EDG

● issuing certificates to Czech academic subjects

Institute of Physics AS CR - FZU

● D0 experiment participation● ATLAS – main contribution to the hadronic

calorimeter TILECAL and Inner Detector (pixel sensors production and test of strip and pixel detectors), power supplies design and production

● Computing – Mass simulation for D0, reconstruction, data

analysis– ATLAS – participation to Data Challenges,

Atlas-LCG

Institute of Physics AS CR – FZU (2)

● Computing projects– EDG from 1 Jan 2001

● WP6 – testbed● CESNET network support important● Plan to continue in EGEE

– LCG – GDB (LHC Computing Grid – Grid Deployment Board)

● LCG deployed in October 2003 – CERN press release

Institute of Physics AS CR – FZU (3)

● Dedicated server farm for HEP and Grid computing – 34x dual 1.13Ghz PIII,

1TB disk array, currently experimenting with new 10 TB disk array

Institute of Physics AS CR – FZU (4)

● Current status– Construction of the new computing room in the institute

● Designed for 150 kW electric power● UPS, cooling, engine-generator● Construction finished by end 2003 with 50% capacity● Full capacity next year

● Application for triple capacity upgrade of the current farm (30 double Xeon units, 20 TB disk space) for the 2004. Hope in positive result.

Job Management●PBS Pro 5.2●LCG1 -> OpenPBS (will merge soon with PBS Pro)●queues

– shortq – normalq– longq

– d0

– atlas

– alice

– hightest

golias:~$ qsub -q atlas run.sh

D0 MC simulations● SAM station

Sequential Access to data via Metadata

● UPS, UPD management of software products on local systems (UPS) downloading products from product distribution servers (UPD)

● D0-RunII software rel. p14.02.00, p14.05.01

EDG, LCG

● We have installed LCG1 software and currently running LCG1-1_1_1 version of the software.

● LCG – middleware software to provide environment for distributed computing for LHC

● Member of WP6 work package – farm is running EDG 1.4 software, for testbed purposes

LCG (1)

● LCG – LHC (Large Hadron Collider) Computing Grid

● The accelerator will start operation in 2007● 12-14 PetaBytes of data will be generated

every year (20 milion Cds). It is assumed that analyzing this will require approximately 70.000 CPUs

LCG(2)

● Based on EDG software – project funded by EU, finishing by the end of this year

● GRID infrastructure allows every member to submit his job (along with JDL file) to the GRID, and after the computing is finished (no matter where), get the output

● In JDL you can specify requirements specific for task (SW versions, # CPUs, etc)

● Distributed storage of data.

LCG(3)

● Installation of LCG software is done through LCFGng toolkit – useful to manage wide variety of configurations for different hosts

● Joining sites are provided with pregenerated skeleton of configuration files in order to simplify installation procedure (it's necessary to modify them)

● Installation is done simply by enabling PXE boot and rebooting the nodes

10TB disk array and Linux

● We have 10 TB disk array. Problem with Linux 2.4 – only 2TB block devices supported

● Patch for LBD exists for 2.4 kernel, but it collides with another patch needed for LVM.

10TB disk array and Linux

● Kernel 2.6 (not yet stable) supports both LBD and device mapper (needed for LVM). After some hacking of NFS code (our patches are incorporated in 2.6.0-test9 kernel) we have successfully created 6 TB partition (XFS, ext2)

Institutions involved – contacts

● Jan Svec <svecj@fzu.cz> - network and system management, D0 experiment (grid)

● Jiri Kosina <kosina@fzu.cz> - installation of grid software at FZU, ALICE experiment, network and system management

● Jiri Chudoba <Jiri.Chudoba@cern.ch> - ATLAS experiment

● <pcclust@cesnet.cz> - CESNET's PC clusters

Summary – Grid infrastructure

● Basic Grid infrastructure has been established during last year and further expansion due to research or commercial needs in future shouldn't be problematic

● CESNET provides good international network connectivity, plan tests of CzechLight optical network

● Preparing for Data Challenges of LHC experiments in 2004