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The EU DataGrid
The European DataGrid Project Team
http://www.eu-datagrid.org/
[email protected]
Tutorial Roadmap
Project Introduction
Security Architecture
The EDG Testbed
Coffee Break
Specific Middleware Issues
Job Management
Data Management
Monitoring & Fabric Management
Application Examples
The EDG Intro– Tutorial - n° 2
The EU DataGrid Project
Introduction
The European DataGrid Project Team
http://www.eu-datagrid.org/
Contents
The EDG Project scope
Achievements
EDG structure
Middleware Workpackages: Goals, Achievements
DataGrid in Numbers
Relation to Sister Projects
The EDG Intro– Tutorial - n° 5
The Grid Vision
Flexible, secure, coordinated resource sharing among dynamic
collections of individuals, institutions, and resource
From “The Anatomy of the Grid: Enabling Scalable Virtual Organizations”
Enable communities (“virtual organizations”) to share
geographically distributed resources as they pursue common
goals -- assuming the absence of…
central location,
central control,
omniscience,
existing trust relationships.
The EDG Intro– Tutorial - n° 6
Grids: Elements of the Problem
Resource sharing
Sharing always conditional: issues of trust, policy, negotiation,
payment, …
Coordinated problem solving
Computers, storage, sensors, networks, …
Beyond client-server: distributed data analysis, computation,
collaboration, …
Dynamic, multi-institutional virtual orgs
Community overlays on classic org structures
Large or small, static or dynamic
The EDG Intro– Tutorial - n° 7
Goals
DataGrid is a project funded by European Union whose objective is to
exploit and build the next generation computing infrastructure providing
intensive computation and analysis of shared large-scale databases.
Enable data intensive sciences by providing world wide Grid test beds to
large distributed scientific organizations ( “Virtual Organizations, Vos”)
Start ( Kick off ) : Jan 1, 2001
End : Dec 31, 2003
Applications/End Users Communities : HEP, Earth Observation, Biology
Specific Project Objectives:
Middleware for fabric & grid management
Large scale testbed
Production quality demonstrations
Collaborate and coordinate with other projects (Globus, Condor, CrossGrid,
DataTAG, etc)
Contribute to Open Standards and international bodies
( GGF, Industry&Research forum)
The EDG Intro– Tutorial - n° 8
DataGrid Main Partners
CERN – International (Switzerland/France)
CNRS - France
ESA/ESRIN – International (Italy)
INFN - Italy
NIKHEF – The Netherlands
PPARC - UK
The EDG Intro– Tutorial - n° 9
Assistant Partners
Industrial Partners
•Datamat (Italy)
•IBM-UK (UK)
•CS-SI (France)
Research and Academic Institutes
•CESNET (Czech Republic)
•Commissariat à l'énergie atomique (CEA) – France
•Computer and Automation Research Institute,
Hungarian Academy of Sciences (MTA SZTAKI)
•Consiglio Nazionale delle Ricerche (Italy)
•Helsinki Institute of Physics – Finland
•Institut de Fisica d'Altes Energies (IFAE) - Spain
•Istituto Trentino di Cultura (IRST) – Italy
•Konrad-Zuse-Zentrum für Informationstechnik Berlin - Germany
•Royal Netherlands Meteorological Institute (KNMI)
•Ruprecht-Karls-Universität Heidelberg - Germany
•Stichting Academisch Rekencentrum Amsterdam (SARA) – Netherlands
•Swedish Research Council - Sweden
The EDG Intro– Tutorial - n° 10
Project Schedule
Project started on 1/Jan/2001
Testbed 0 (early 2001)
International test bed 0 infrastructure deployed
Testbed 1 ( 2002 )
First release of EU DataGrid software to defined users within the project:
Builds on Testbed 1 to extend facilities of DataGrid
Focus on production quality
Testbed 3 (2003)
HEP experiments (WP 8), Earth Observation (WP 9), Biomedical applications (WP 10)
Testbed 2 (End 2002)
Globus 1 only - no EDG middleware
Advanced functionality; currently being deployed.
Project stops on 31/Dec/2003
The EDG Intro– Tutorial - n° 11
DataGrid Work Packages
The EDG collaboration is structured in 12 Work Packages
WP1: Work Load Management System
WP2: Data Management
WP3: Grid Monitoring / Grid Information Systems
WP4: Fabric Management
WP5: Storage Element
WP6: Testbed and demonstrators – Production quality
International Infrastructure
WP7: Network Monitoring
WP8: High Energy Physics Applications
WP9: Earth Observation
WP10: Biology
WP11: Dissemination
WP12: Management
The EDG Intro– Tutorial - n° 12
DataGrid Architecture
Local Computing
Grid
Local Application
Local Database
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to
File Mapping
Collective Services
Information
&
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL
Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Grid
Fabric
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
The EDG Intro– Tutorial - n° 13
EDG Interfaces
Application
Developers
System
Managers
Local Database
Scientist
s
Grid Application Layer
Data
Management
Job
Management
File
Systems
Local Application
Metadata
Management
Object to File
Mapping
Certificate
Authorities
Collective Services
User Accounts
Information
& Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL
Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Operating
Systems
Mass Storage
Systems
HPSS, Castor
Storage
Elements
Batch Systems
PBS, LSF
Computing Elements
The EDG Intro– Tutorial - n° 14
WP1: Work Load
Management
Local Application
Grid Application Layer
Data
Management
Job
Management
Goals
Maximize use of resources by
efficient scheduling of user jobs
Achievements
Definition of architecture for scheduling
& res. mgmt. and accounting &
reservation
Local Database
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Development of "super scheduling"
component using application data and
computing elements requirements
Support for MPI jobs
Logical job check pointing
Interactive jobs
The EDG Intro– Tutorial - n° 15
EDG middleware architecture:
The Workload Management System (WP1)
WP1 is responsible for the Workload Management System (WMS).
The WMS is currently composed by the following parts:
User Interface (UI) : access point for the user to the GRID ( using JDL)
Resource Broker (RB) : the broker of GRID resources, matchmaking
Job Submission System (JSS) : Condor-G; interfacing batch systems
Information Index (II) : an LDAP server used as a filter to select
resources
Logging and Bookkeeping services (LB) : MySQL databases to store Job
Info
The EDG Intro– Tutorial - n° 16
WP1: Work Load
Management
Local Application
Grid Application Layer
Job
Managem.
Components
Job Description Language
Grid
Scheduler
SQL
Database
Services
User Interface
UI : python (LB client : C++)
RB : C++
JSS : C++, python
II : LDAP server
LB: MySQL, C++
Input/Output Sandboxes: GridFTP
Object to
File
Mapping
Replica
Manager
Info &
Monitor
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
Accounting
Logging &
Bookkeeping
Fabric services
Resource
Managem.
Implementation:
Metadata
Managem.
Underlying Grid Services
Information Index
Logging & Bookkeeping Service
Data
Managem.
Collective Services
Resource Broker
Job Submission Service
Local Database
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
WMS main interfaces:
Globus Gatekeeper
WP2 Replica Catalog APIs
WP3 Information Systems
WP7 network monitoring info providers
End User (using JDL files, on the UI)
The EDG Intro– Tutorial - n° 17
WP2: Data Management
Goals
Coherently manage and share petabyte-scale
information volumes in high-throughput
production-quality grid environments
Achievements
Survey of existing tools and technologies for
data access and mass storage systems
Definition of architecture for data
management
Local Database
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Deployment of Grid Data Mirroring Package
(GDMP) in Testbed 1
Deployment of EDG Replica Manager in
Testbed 2
Close collaboration with Globus,
PPDG/GriPhyN & Condor
Local Application
Common design of RLS
Working with GGF on standards
The EDG Intro– Tutorial - n° 18
EDG middleware architecture:
WP2 (Data Management )
WP2 is responsible for Data Management, which includes file and
replica management, metadata access and data security.
WP2 components:
Replica Manager: the main manager for triggering replica execution
all over the GRID, including replica optimization and interfacing the
replica catalog service
Replica Catalog: a GRID service used to resolve Logical File Names
into a set of corresponding Physical File Names – Globus Replica
Catalog and Replica Location Service (RLS)
GDMP: the GRID Data Mirroring Package, used to create replicas of
any filetype all over the GRID Storage Elements in a synchronized
way, by automatic updating the replica catalog
Spitfire: provides a Grid enabled middleware service for access to
relational databases : it consists of the Spitfire Server module and
the Spitfire Client libraries and command line executables.
The EDG Intro– Tutorial - n° 19
WP2: Data
Management
Local Application
Grid Application Layer
Job
Managem.
Deployed Components
GridFTP
Grid
Scheduler
SQL
Database
Services
Object to
File
Mapping
Replica
Manager
Info &
Monitor
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
Accounting
Logging &
Bookkeeping
Fabric services
Resource
Managem.
Metadata
Managem.
Underlying Grid Services
GDMP
Spitfire
Data
Managem.
Collective Services
Replica Manager - edg-replicamanager and Reptor
Replica Catalog - globus-replicacatalog
Local Database
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
Implementation:
RM: C++
WP2 main interfaces:
Reptor: Java based Web Services
RC : Globus Replica Catalog wrapper
GDMP : C++
Spitfire : Java, Web Services
The GRID Storage Element
WP1 Resource Broker APIs
WP3 GRID Info services
WP7 network monitoring info providers
End User (using GDMP)
The EDG Intro– Tutorial - n° 20
WP3: Grid Monitoring Services
Goals
Provide information system for
discovering resources and monitoring
status
Achievements
Local Application
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
Survey of current technologies
SQL Database
Services
Coordination of schemas in testbed 1
Fabric services
Development of Ftree caching backend
based on OpenLDAP (Light Weight
Directory Access Protocol) to address
shortcoming in MDS v1
Local Database
Resource
Management
Computing
Element
Services
Configuration
Management
Storage
Element
Services
Replica
Catalog
Monitoring
and
Fault Tolerance
Authorizat ion
Logging &
Authentication
and Accounting Book-keeping
Node
Installation &
Management
Fabric Storage
Management
Relational Grid Monitoring Architecture (RGMA)
GRM and PROVE adapted to grid
environments to support end-user
application monitoring
The EDG Intro– Tutorial - n° 21
WP3 : GRID Monitoring and Info
Providers
WP3’s task is to provide information about
The Grid itself
This includes information about resources (ComputingElements,
StorageElements and the Network), for which the Globus MDS is
a common solution; and job status information
(as implemented by WP1's Logging and Bookkeeping).
Grid applications
This is information published by user jobs. This is used for
performance monitoring.
R-GMA
relational implementation of the GGF GMA
interoperable with MDS
The EDG Intro– Tutorial - n° 22
WP3: GRID
Monitoring
Local Application
Grid Application Layer
Job
Managem.
Components
SQL
Database
Services
R-GMA : Java , C++, MySQL,
TomCat
Resource
Managem.
MDS : LDAP, Globus GRIS, GIIS
GRM / PROVE : P-GRADE
Info &
Monitor
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
Accounting
Logging &
Bookkeeping
Fabric services
Implementation:
FTree : OpenLDAP, caching
Object to
File
Mapping
Underlying Grid Services
GRM/Prove
Metadata
Managem.
Replica
Manager
Grid
Scheduler
R-GMA
Data
Managem.
Collective Services
MDS / FTree
Local Database
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
WP3 main interfaces:
WP1 Resource Broker ( InfoIndex)
WP2 RM optimizer
all GRID services producing info
(SE,CE..)
WP7 network monitoring
The EDG Intro– Tutorial - n° 23
WP4: Fabric Management
Goals
manage clusters (~thousands)
of nodes
Achievements
Survey of existing tools,
techniques and protocols
Local Application
Local Database
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Logging &
Authentication Book-keeping
and Accounting
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Defined an agreed architecture for
fabric management
Initial implementations deployed at
several sites in testbed 1 & 2
The EDG Intro– Tutorial - n° 24
EDG middleware architecture:
WP4 : Fabric Management Components
WP4 is responsible to deliver a computing fabric comprised of all
the necessary tools to manage a center providing grid services on
clusters of thousands of nodes. The computing fabric is called the
Computing Element in EDG.
User Job Control and Management (Grid and local jobs) on
fabric batch and/or interactive CPU services
Gridification – Grid interface to fabric resources
Resource Management – manage underlying batch services
Automated System Administration for Computing Fabric
Elements. These subsystems are reserved for system
administrators and operators for performing system maintenance
Configuration Management
Installation Management
Fabric Monitoring
The EDG Intro– Tutorial - n° 25
WP4: Fabric
Management
Local Application
Local Database
Grid Application Layer
Job
Managem.
Data
Managem.
Metadata
Managem.
Components
Object to
File
Mapping
Collective Services
LCFG
Replica
Manager
Grid
Scheduler
Fabric Monitoring
PBS & LSF info providers
Info &
Monitor
Underlying Grid Services
SQL
Database
Services
Image installation
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
Accounting
Logging &
Bookkeeping
Config. Cache Mgr
Fabric services
Resource
Managem.
Implementation:
LCFG : C++, XML, HTTP
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
WP4 main interfaces:
WP1 Resource Broker ( InfoIndex)
WP2 Data management
WP5 Storage Element
WP3 GRID Info Services
The EDG Intro– Tutorial - n° 26
WP5: Mass Storage Management
Goals
Local Application
Provide common user and data
export/import interfaces to existing
local mass storage systems
Achievements
Review of Grid data systems, tape and
disk storage systems and local file
systems
Definition of Architecture and Design
for DataGrid Storage Element
Local Database
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Collaboration with Globus on
GridFTP/RFIO
Collaboration with PPDG on control API
First attempt at exchanging
Hierarchical Storage Manager (HSM)
tapes
SRM compliant interface to MSS
The EDG Intro– Tutorial - n° 27
WP5 : Mass Storage Management
WP5 delivers the Grid interface to Storage.
Its service, the Storage Element (SE) is interfacing to
underlying Mass Storage Systems or simple storage services.
Main interfaces:
Data, gridftp will be used to transfer files over the WAN and the
files will optionally be available to local nodes by NFS.
Information, Existing MDS information providers will be extended
to provide the extra information in the GLUE storage schema.
Control, functions such as reservation, pinning, deletion, and
transfer time estimation. Will provide an SRM 2 interface.
The EDG Intro– Tutorial - n° 28
WP5:
Mass Storage
Management
Achievements
Local Application
Local Database
Grid Application Layer
Job
Managem.
Definition of Architecture and Design
for DataGrid storage Element
Data
Managem.
Metadata
Managem.
Object to
File
Mapping
Collective Services
Replica
Manager
Grid
Scheduler
Collaboration with Globus on
GridFTP/RFIO
Info &
Monitor
Underlying Grid Services
Collaboration with PPDG on control API
SQL
Database
Services
Staging from/to CASTOR at CERN
succesfully implemented and tested
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
Accounting
Logging &
Bookkeeping
Fabric services
Succesfully Interfaced to GDMP
Resource
Managem.
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
Supported Storage Systems:
UNIX disk systems
HPSS (High Performance Storage
System)
CASTOR (through RFIO)
GridFTP servers
DMF
Enstore
WP5 (SE) main interfaces:
WP1 Resource Broker & JSS
WP2 RM, RC
WP7 for GRIDftp monitoring
WP3 GRID Info Services
The EDG Intro– Tutorial - n° 29
WP6: TestBed Integration
Goals
Deploy testbeds for the end-to-end
application experiments & demos
Integrate successive releases of the software
components
Achievements
Integration of EDG sw and deployment
Working implementation of multiple Virtual
Organizations (VOs) s & basic security
infrastructure
Definition of acceptable usage contracts and
creation of Certification Authorities group
Definition of test plan
User’s, administrator’s, and developer’s guides
Local Application
Local Database
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeeping
Fabric services
Resource
Management
Monitoring
and
Fault Tolerance
Configuration
Management
EDG release
Globus
Node
Installation &
Management
Fabric Storage
Management
WP6 additions
to Globus
Components
Globus packaging & EDG
config
Build tools
End-user documents
The EDG Intro– Tutorial - n° 30
Tasks for the WP6 integration team
Testing and integration of the Globus package
Exact definition of RPM lists (components) for the various
testbed machine profiles (CE service , RB, UI, SE service , NE,
WN, ) – check dependencies
Perform preliminary centrally (CERN) managed tests on EDG
m/w before green light for spread EDG testbed sites
deployment
Provide, update end user documentation for installers/site
managers, developers and end users
Define EDG release policies, coordinate the integration team
staff with the various WorkPackage managers – keep high
inter-coordination.
Assign the reported bugs to the corresponding developers/site
managers (BugZilla)
Complete support for the iTeam testing VO
The EDG Intro– Tutorial - n° 31
WP6: TestBed Integration and
demonstrators
Local Application
WP6
goals: the EDG testbed
Grid Application Layer
Managem.
Integration of EDG sw releases and
deployment all over the EDG testbed
Collective Services
: the integration team
Job
Working implementation of multiple
VOs & basic security infrastructure
Definition of acceptable usage
contracts and creation of
Certification Authorities group
Set up of the Authorization Working
Group to manage authorization
policies on the testbed
2 Testbeds:
Local Database
Data
Managem.
Metadata
Managem.
Object to
File
Mapping
Replica
Manager
Grid
Scheduler
Info &
Monitor
Underlying Grid Services
SQL
Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authenticatio
n Accounting
Logging &
Bookkeeping
Fabric services
Resource
Managem.
Config
Management
Monitoring
Fault
Tolerance
Node
Installation
Management
Fabric Storage
Management
Components
Support for test-VO, mkgridmap tools
Dev. TB for integration
Globus packaging & EDG config
Application TB for application usage
Build tools, CVS central s/w repository
Certification TB planned
End-user documents
The EDG Intro– Tutorial - n° 32
WP7: Network Services
Local Application
Goals
Local Database
Review the network service requirements for
DataGrid
Establish and manage the DataGrid network
facilities
Monitor the traffic and performance of the
network
Deal with the distributed security aspects
Achievements
Analysis of network requirements for testbed 1
& study of available network physical
infrastructure
Use of European backbone GEANT since Dec.
2001
Initial network monitoring architecture defined
and first tools deployed
Collaboration with Dante & DataTAG
Working with GGF (Grid High Performance
Networks) & Globus (monitoring/MDS)
Network cost estimation for workload and data
management
Grid Application Layer
Data
Management
Job
Management
Metadata
Management
Object to File
Mapping
Collective Services
Information &
Monitoring
Replica
Manager
Grid
Scheduler
Underlying Grid Services
SQL Database
Services
Computing
Element
Services
Storage
Element
Services
Replica
Catalog
Authorization
Authentication
and Accounting
Logging &
Bookkeepgin
Fabric services
Resource
Management
Configuration
Management
Monitoring
and
Fault Tolerance
Node
Installation &
Management
Fabric Storage
Management
Components
network monitoring
tools:
PingER
Udpmon
Iperf
The EDG Intro– Tutorial - n° 33
Applications (WP8-10)
Earth Observation
Science Applications
Biomedical
Applications
High Energy Physics
The EDG Intro– Tutorial - n° 34
Grid aspects covered by EDG
VO servers
LDAP directory for mapping
users (with certificates) to
correct VO
Storage Element
Grid-aware storage area,
situated close to a CE
User Interface
Submit & monitor jobs,
retrieve output
Replica Manager
Replicates data to one or more
CEs
Job Submission Service Manages submission of jobs
Replica Catalog
Keeps track of multiple data
files “replicated” on different
CEs
Information index
Provides info about grid
resources via GIIS/GRIS
hierarchy
Information &
Monitoring
Provides info on resource
utilization & performance
Resource Broker
Uses Info Index to discover
& select resources based on
job requirements
Grid Fabric Mgmt
Configure, installs & maintains
grid sw packages and environ.
to Res. Broker
Logging and Bookkeeping Collects resource usage &
job status
Computing Element
Gatekeeper to a grid
computing resource
Network performance, Provides efficient network
security and monitoring transport, security &
bandwidth monitoring
Testbed admin.
Certificate auth.,user reg.,
usage policy etc.
The EDG Intro– Tutorial - n° 35
DataGrid in Numbers
People
Testbeds
>350 registered users
>15 regular sites
12 Virtual Organisations
>10’000s jobs submitted
16 Certificate Authorities
>1000 CPUs
>200 people trained
278 man-years of effort
>5 TeraBytes disk
3 Mass Storage Systems
100 years funded
Software
50 use cases
18 software releases
>300K lines of code
Scientific applications
5 Earth Obs institutes
9 bio-informatics apps
6 HEP experiments
The EDG Intro– Tutorial - n° 36
Related Grid
Projects
Through links with sister projects, there is the
potential for a truely global scientific applications grid
Demonstrated at IST2002 and SC2002 in November
The EDG Intro– Tutorial - n° 37