# Presentation: 407290

## Atlas Grid Status - part 1

**Jennifer Schopf**
**ANL**
- U.S. ATLAS Physics and Computing Advisory Panel Review
- Argonne National Laboratory
- Oct 30, 2001

## Globus/Atlas Interactions

- GRAPPA/
- Gardner,
- Bramley

- Grid Data
- Access/
- Malon

- Magda/
- Wenaus

- Monitoring/
- De, Schopf,
- Taylor, Yu, etc

- Condor (G)

- GRAM

- GSI

- MDS/
- GIIS/GRIS

- GridFTP

- Replica Cat

- Replica Mgr

- PacMan/
- Youssef

- Packaging

- Jennifer Schopf, ANL

- Oct 2001

## Globus ToolkitTM

- Core protocols and services
- Grid Security Infrastructure
- Grid Resource Access & Management
- MDS information service & monitoring
- GridFTP data access & transfer
- Data Grid technologies
- Replica catalog, replica management service
- Reliable file transfer
- Defacto-standard for Grid projects:
- GriPhyN, PPDG, NEES, EU DataGrid, ESG, Fusion Collaboratory, DISCOM, NASA IPG, NSF TeraGrid, DOE Science Grid, EU DataGrid, UK Grid Center, U.S. GRIDS Center, Access Grid, GridPort, MPICH-G2, Condor-G, GrADS, and others

- Jennifer Schopf, ANL

- Oct 2001

## Globus Status

- New release
- In alpha4 now, beta before SC ‘01 (Nov 15), 4Q01 release
- New packaging: enables modular binary and source distributions
- GRAM 1.5 (job submission): enhanced robustness
- MDS-2.1 (information service): security, better performance, etc.
- GridFTP- secure large file transfer
- Replica Mgt-  Data management, catalogs for replicas
- Continuing work
- Community Authorization Services
- Reliable file transfer
- Java, other “Commodity Grid” toolkits

- Jennifer Schopf, ANL

- Oct 2001

## ATLAS GriPhyN/iVDGL

- GriPhyN funded Fall 2000, $11.9M/5 years
- iVDGL funded Fall 2001, 5 years, $13.65M/5 year
- Both involve ATLAS, CMS, Ligo and SDSS
- ATLAS support: 2.5 FTE IU, 1.5 FTE BU, $331K/5yr IU HW
- R. Gardner is the ATLAS lead, J. Schopf is the CS liaison
- GriPhyN proposal emphasizes virtual data requirements, collaboration between experiments
- iVDGL proposal emphasizes testbed and infrastructure issues across experiment

- Jennifer Schopf, ANL

- Oct 2001

## GriPhyN

- Principal ATLAS GriPhyN/iVDGL deliverables:
- 2001: Testbed with GriPhyN VDT 1.0, packaged with PacMan
- 2002: Serving DC1 data
- 2003: Dataset re-creation/Data signature
- Additional efforts:
- Monitoring: Dantong Yu, BNL, and J. Schopf,ANL,  joint with PPDG
- GRAPPA: Rob Gardner and Randy Bramley, IU

- Jennifer Schopf, ANL

- Oct 2001

## GriPhyN Testbed Issues

- GriPhyN is defining VDT 1.o
- SW install for GriPhyN/PPDG, compatible with EDG as well
- Globus 2.0 beta when it’s released (10/30)
- GSI, GridFTP, MDS, repl, cat stuff, etc (Gram 1.5)
- GDMP 2.0 (supports flat files)
- Condor 6.3.1 (also Condor-G, Dagman)
- Extra tools for ATLAS
- objectivity 6.1
- Magda
- Still need to resolve CA issue between EDG and US test sites

- Jennifer Schopf, ANL

- Oct 2001

## GriPhyN ATLAS Goal 1Serving DC1 Data (July-Dec 2002)

- Limited reconstruction analysis job using grid job submission interface
- Serving the data results form DC1
- As part of DC1, data must be tagged with meta data for ease of access
- Minimal keywords would be sufficient
- Magda already implements portions of this
- Job submission with minimal smarts
- Extend GRAPPA work
- Move compute resources to data sites

- Jennifer Schopf, ANL

- Oct 2001

## GriPhyN ATLAS Goal 2Dataset Re-creation (Jan-Sept 2003)

- Goal: be able to re-create a data file
- Need to evaluate what parameters need to be kept track of
- Need to evaluate data needed for full data signature
- Need to develop a metric for evaluating success - what is good enough?

- Jennifer Schopf, ANL

- Oct 2001

## GRAPPA: Grid Access Portal for Physics Applications

- Provide a point of access to ATLAS grid resources
- IU (Physics, CS), Northwestern (ECE), ANL (CS), BU (Physics),
- Provide a simple interface for physicists to submit and monitor jobs on the Grid
- Web-based as well as script-based
- Ability to “replay”
- Compatible with both ATLSim and Athena architecture
- Adaptable and/or “extensible” to new developments in Grid software, Athena, etc

- Jennifer Schopf, ANL

- Oct 2001

## GRAPPA Components

- User Interface
- Job submission
- Monitoring
- Bookkeeping
- Resource selection

- Jennifer Schopf, ANL

- Oct 2001

## Current Status

- Simple prototype that allows users to submit an Athena job from a web interface to the Condor pool on the Atlas IU cluster (via Globus)
- Next steps
- Adding more Athena functionality to the interface (e.g., user's defined libraries)
- Experiment with other job launch mechanisms
- Condor-G and DAGMAN description language
- Web Services Flow Language as a more general workflow description
- Explore interfaces for multiple metadata and replica catalog systems.
- http://lexus.physics.indiana.edu/~griphyn/grappa/

- Jennifer Schopf, ANL

- Oct 2001

## Grid-Enabled Data Access in Athena

- David Malon, ANL
- Integrate Grid Data Access techniques (Globus replica catalog and/or GDMP) into the Athena event selection module
- When a file is needed, a check is done to see if the file is local
- if not, use Grid Data Access tools to make it local

- Jennifer Schopf, ANL

- Oct 2001

## Grid-Enabled Data Access in Athena

- Athena and Globus
- Search Globus replica catalog and select
- Transfer file using the protocol associated with the location object in the catalog (gsiftp, https/globus-url-copy from a remote gass_server, ...)
- Athena and GDMP
- Work to date uses GDMP 1.2.2, which had not yet incorporated the Globus replica catalog
- Uses the GDMP import/export catalogs
- Supports certain subscription-based approaches
- Automatically updates Objectivity/DB internal catalog when Objectivity database files are transferred

- Jennifer Schopf, ANL

- Oct 2001

## Status

- Paper presented at CHEP
- Prototype up and running on ANL systems
- GDMP-based prototype work done between CERN and Milan
- Next Steps:
- GDMP will use Globus data replica work
- Use GDMP to copy files
- Requirements and design work for interfaces between Athena data producers and metadata catalogs and replica management services (e.g., Magda)
- Metadata work – extending the Athena Event Selector properties to allow for data signature/virtual data

- Jennifer Schopf, ANL

- Oct 2001

## Monitoring

- Joint working group set up between PPDG and GriPhyN to investigate monitoring issues
- Led by J. Schopf and D. Yu
- Monitoring currently defined very broadly:
- Is this router configured correctly?
- Has the application finished using that file yet?
- What information do I need to determine where to run my application?

- Jennifer Schopf, ANL

- Oct 2001

## GridView (Kaushik De)

- Tool to show the status of the 8 test bed machines on the web
- Uses Globus GRAM to query sites every 30 mins
- Hostname, Uptime, Idletime, # users, and Load average
- Next steps include
- Integration with Globus information service (MDS)
- Visualization as part of cross PPDG/GriPhyN monitoring work

- Jennifer Schopf, ANL

- Oct 2001

## Slide 18

- Jennifer Schopf, ANL

- Oct 2001

## Application Level Monitoring (Taylor)

- Initial testbed to incorporate GRID monitoring capabilities into Athena
- Collaboration with Valerie Taylor, David Quarrie, and others
- Very long ramp-up due to difficulty of “outsiders” running an Athena application
- Working on developing an Auditor for Athena
- http://www.ece.nwu.edu/EXTERNAL/vtaylorlab/prophesy.html

- Jennifer Schopf, ANL

- Oct 2001

## Current Status

- Mailing list has been set up
- pg-monitoring@mcs.anl.gov
- Defining usage cases
- Sensors
- Predictors
- Archiving
- Will gather requirements and look at extending Globus MDS as a common framework to meet these requirements

- Jennifer Schopf, ANL

- Oct 2001

## Summary

- Globus
- GriPhyN/iVDGL
- Grappa
- Grid-Enabled Data Access
- Monitoring and Visualization

- Jennifer Schopf, ANL

- Oct 2001