HEP Grid Activities in China
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- Terence Andrews
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1 HEP Grid Activities in China Sun Gongxing Institute of High Energy Physics, Chinese Academy of Sciences CANS Nov. 1-2, 2005, Shen Zhen, China
2 History of IHEP Computing Center Found in 1974 Computing Platform -DJS-8(320)(1974) - VAX (1984) - HP cluster (1995) - PC farm (1998) Network Technologies - First internet link (1984). - Network security (firewall, IDS, etc) (1987) - First web server (1994). - DataGrid (2003)
3 Outline High energy physics experiments in China LCG Beijing site state for CMS /Atlas Site automated installation/upgrade Certificate Authority and BES VOMS Site operation and monitoring Grid-based physics analysis environment Big picture of HEP Grid roadmap
4 Experiments at IHEP Beijing Electron-Positron Collider upgrade (BEPCII). LHC collaboration for CMS and Atlas experiments. Cosmic ray experiment eas (China-Japan) and argo (China-Italy) at Tibet.
5 Computing Requirements Table 1: LHC Atlas, CMS,BEPCII/BESIII event rate and size ATLA S Rate [Hz] RAW [MB] RECO [MB] AOD [kb] MC [MB/evt] MC % of real CMS BESII I Plus: ARGO cosmic ray experiment
6 Experiments Data BES: 4960TB ( tape lib. + Disk cache) for raw, rec., MC, MC-rec., DST. Atlas & CMS: 500TB (Disk cache) for Rec., MC, AOD, ESD, tag. Argo: 240TB (Tape + dcache) for raw, MC., rec., ntpl.
7 Computing requirement Data processing & re-processing and MC. Rec. analysis. - BESIII: 1504 KSI2K. - LHC Atlas & CMS: 1000 ksi2k respectively. - ARGO: 400 KSI2K. Total: 4000 KSI2K (4000Xeon 3.0 CPUs).
8 Collaboratories 18 domestic plus 4 international institutions for BESIII exp. Global collaboration for cms & atlas/lhc. Several groups from China and Italy for ARGO exp. Distributed geographically collaboration.
9 HEP computing model in China Adapt LHC Computing Grid-LCG. Be Compatible with US OSG (Open Science Grid). Be both data- and computing- intensive grid. And high performance, huge data storage and transfer/access.
10 Network Infrastructure 2.5Gbps international link for cms & atlas /LHC transfer between IHEP and IN2P3/Lyon, maybe Fermi lab, ASCC/Taipei or CHEP/Korean? Gbps for BESIII collaboration among domestic universities and institutes. 155Mbps for ARGO experiment physics analysis between China and Italy. HEP is network bandwidth-consuming application.
11 LHC computing Grid Built on top of globus and VDT(Virtual Data toolkit) by EU DataGrid. Be quiet stable from lcg-2.6.0, and composed of 171 distributed sites over 40 countries. SC3 ( Services Challenge 3) is been conducting, in particular, data transfer and file catalogue service.
12 LHC Computing environment Total: Total: Sites Sites ~9299 ~9299 CPUs CPUs TByte TByte
13 Hierarchical Computing Model Tier-0 at CERN Record RAW data (1.25 GB/s ALICE) Distribute second copy to Tier-1s Calibrate and do first-pass reconstruction Tier-1 centres (11 defined) Manage permanent storage RAW, simulated, processed Capacity for reprocessing, bulk analysis Tier-2 centres (>~ 100 identified) Tier-3 Monte Carlo event simulation End-user analysis Facilities at universities and laboratories Access to data and processing in Tier-2s, Tier-1s Outside the scope of the project
14 Grid Services (EGEE) Storage Element Mass Storage System (MSS) (CASTOR, Enstore, HPSS, dcache, etc.) Storage Resource Manager (SRM) provides a common way to access MSS, independent of implementation File Transfer Services (FTS) provided e.g. by GridFTP or srmcopy Computing Element Interface to local batch system e.g. Globus gatekeeper. Accounting, status query, job monitoring Virtual Organization Management Virtual Organization Management Services (VOMS) Authentication and authorization based on VOMS model. Grid Catalogue Services Mapping of Globally Unique Identifiers (GUID) to local file name Hierarchical namespace, access control Interoperability EGEE and OSG both use the Virtual Data Toolkit (VDT) Different implementations are hidden by common interfaces
15 EGEE components Concert User interface Input sandbox DataSets info Output sandbox Resource Broker SE & CE info Input sandbox + Broker Info Replica Catalogue Output sandbox Author. &Authen. Job Submit Event Job Query Job Status Publish Logging & Book-keeping keeping Job Status Computing Element
16 Interaction between components
17 Mass Storage System Mass storage and central data recording. Tape library for terrtiry storage. Disk cache for faster I/O speed. Global view of name space. File system-like UNIX file access semantics (for instance, open()/write()/lseek(), etc.
18 Castor-Hierarchical Storage System
19 Data Transfer and Access
20 LCG Beijing site UI:User Interface MDS:Monitoring and Discovery Service RB:Resource Broker. CE:Computing Element WN:10 dual-cpu work nodes. SE: Storage Element BDII: Meta-Information system Myproxy:renew proxy cert validity MON:R-GMA/Monitoring service LFC:LHC File Catalogue
21 CA/VOMS development and operation Built into IHEP Certificate Authority from OpenCA. Be a working CA and able to issue user s cert, host cert. and service certificate over China HEP community. Set up the BES Virtual Organization for home experiment. Has Issued about 20 certificates of users and host/services. Integrated BES VO with LCG Beijing site which forms a full functional site.
22 Web-based CA User Interface
23 VOMS for BES experiment
24 Site automatic installation-quattor Quattor takes care of the configuration, installation and management of fabric nodes A Configuration Database holds the desired state of all fabric elements Node setup (CPU, HD, memory, software RPMs/PKGs, network, system services, location, audit info ) Cluster (name and type, batch system, load balancing info ) Defined in templates arranged in hierarchies common properties set only once Autonomous management agents running on the node for Base installation Service (re-)configuration Software installation and management Quattor was initially developed in the scope of EU DataGrid.
25 Quattor Architecture (ready for LCG ) CLI GUI scripts Configuration server SOAP SQL SQL backend CDB XML backend HTTP TFTP DHCP HTTP PXE etc XML configuration profiles SW server(s) SW Repository HTTP RPMs Node Configuration Manager NCM CompA CompB CompC ServiceA ServiceB ServiceC RPMs / PKGs SW Package Manager SPMA base OS HTTP / PXE Install server Install Manager System installer
26 IhepGrid Monitoring
27 LHC Era Monitoring Lemon Correlation Engines SOAP Repository backend Monitoring Repository SQL SOAP RRDTool / PHP apache TCP/UDP HTTP Nodes Monitoring Agent Lemon CLI Web browser Sensor Sensor Sensor User User Workstations
28 IHEP Computing Fabric CNIC Interactive farm Disk Cache Farm ON-line farm 10Gbps IHEP Campus Network 10Gbps 10Gbps 10GE/InfiniBand (computing. & Storage Network) 10Gbps TPservers 10Gbps FC 1GE 1GE 1GE Home Dirs(AFS) +Monitoring +Scheduler 1Gbps CPU servers
29 Installation of Beijing site Using Quattor-LCG software for Beijing LCG site installation. It covers all node types installation, including CE, UI, SE, LFC, WN, Myproxy, BDII, etc. It makes things quiete easy. Lemon will be monitoring the fabric facilities at Beijing site.
30 Job submission
31 Job submission statistics
32 Common HEP application Simulation Program Reconstruction Program Analysis Program Event Detector Calibration Algorithms Experiment Frameworks Engines Persistency DataBase Batch Generators Framework FileCatalog Conditions Interactive Simulation Data Management Distributed Analysis Geometry Histograms Fitters NTuple Physics MathLibs I/O GUI 2D Graphics PluginMgr Dictionary Interpreter Collections 3D Graphics Foundation Utilities OS binding Core
33 CMS Physics analysis on the Grid Phedex (Physics Experiment Data Export) for dataset (1000+ files) transfer. - manage prioritized transfers of files from multiple sources to multiple sinks. - Provide information on cost latency and rate of any transfer to enable scheduling. Data validation: file integrity (checksum, size), data readiness, calibration etc. BOSS for job monitoring.
34 Experiments on the grid CMS and Atlas / LHC BESIII / BEPCII for MC and MC-rec. ARGO at Tibet for all relevant physics activities.
35 Domestic collaboration (possible solution) BES On line system YBJ On-line processor farm CERN CMS & ATLAS Tier 2 IHEP Computer Center CASTOR data cache pku Tier 3 Tier 4
36 Grid R & D CA/VOMS R & D: Hierarchal CA, Multiple RA, more grained authority machanism. China s HEP grid portal. Grid (BESIII) and Regional (Atlas and CMS) Operation center. Gird accounting under development. Computing resource mgt. under development Etc.
37 HEP Grid Portal development
38 Thank you for your comments!
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