DataGrid Workshop Oxford, July 2-5 INFN Testbed status report Luciano Gaido 1 DataGrid Workshop INFN...

DataGrid Workshop Oxford, July 2-5

INFN Testbed status reportLuciano Gaido

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DataGrid Workshop

INFN Testbed status report L. Gaido

Oxford July, 2-5 2001



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Dedicated resources(available now)

Quantum Grid: 3-4 PCs in 15 sites: Bari, Bologna, Cagliari, Catania, Cnaf,

Ferrara, Lecce, Legnaro, Milano, Napoli, Padova, Parma, Pisa, Roma, Torino

Total: ~ 50 nodes

1 SUN cluster (5 nodes) at CNAF

Some more hosts dedicated to specific activities



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Non dedicated resources

The LHC experiments have their own farms (~ 100

nodes in 8 sites), dedicated to production activities, in some INFN sites.Since the experiments play a fundamental role in Testbed and some of the test steps will require experiments’ production environment these resources will also be used for Testbed activities (but it is up to the experiments decide when,

where and and how).



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Further dedicated resources(available soon)

In order to have enough resources available forthe Testbed activities 6 new farms have been funded by InfnGrid project.So, in the next months, farms made up of - 1 disk server (~ 300 GB) - 5 dual PIII 1 GHz will be bought and set up in:Catania, Cnaf, Milano, Padova, Pisa and Torino



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How have they been used?The currently available resources have been used for:

- Globus Toolkit evaluation activities

(a report has been produced)- InfnGrid toolkit production (Globus toolkit + GDMP +

support for various CAs + configuration scripts, etc.)- Implementation of the GIS INFN infrastructure (an index server, GIIS, in each INFN unit) - MDS-2 tests (presentation by A. Cavalli in the MDS-2

session, Wednesday 9:00-11:00)- GridFTP tests- “toys” for the site managers



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How have they been used?

- LHC experiments’ tests: - ALICE Catania, Cagliari, Torino, Lyon.... - ATLAS Milano, Roma, CERN - CMS Bologna, Padova, Pisa, Roma.... Testbed resources and experiments’ resources have

been used for these tests.



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How have they been used?

Presentations about these activities have been given at the InfnGrid workshop held in Catania (April, 9-11) and in the DataGrid WP8 meeting (May, 31)

http://pcct108.ct.infn.it/grid/workshop-ct/

http://datagrid-wp8.web.cern.ch/DataGrid-WP8/meeting_main.htm



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How will they be used?

The INFN Testbed resources will be primarily used forInfnGrid Testbed activities and tests.

Some of the InfnGrid Testbed activities are also DataGrid

activities, some are INFN specific. Some words about

them in a few moments…

Some guidelines (and tools) to request and allocate theTestbed resources for test purposes have been

produced

for INFN.



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How will they be used?

The INFN Testbed resources can also be used forDataGrid Testbed activities.

But we need to: - define clearly which resources each DataGrid

partner reserves for DataGrid Testbed

- define how to manage the allocation and usage of the testbed resources at the DataGrid level (Europe + some USA sites)



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InfnGrid guidelines

- The requester (Test Coordinator) submits a form describing the goals and all the relevant information

(users involved, needed resources, grid services, etc.) about the test to a technical group, the Planning Group.

- The PG evaluates the request and allocates the resources (via the resource database) to the test users,

gets the appropriate grid-mapfile from the Certificates database manager and sends it to the site managers.



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InfnGrid guidelines

- The site managers have the responsibility to install the farms, the needed software and have to provide the first basic support.

- At the end of the test activity the Test Coordinator produces a report

- The InfnGrid WP6 coordinators supervise the whole activity



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Grid resource database and tools (by L. Fonti)



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Grid Resource Database

A database has been created for the resources of the Grid pool.

The database backend is an XML file.The database management tool is a

java servlet.All database management is done on

the web, through web pages produced by servlet.



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XML database backend

XML has been choosen as database backend, because its element nesting capability is particularly suitable to reflect the hierarchical tree-based structure of Grid resource layout.

Moreover, XML offers an open, freely expandable database schema.



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XML file structure <GRID> <ORGANIZATION name=“INFN”> <UNIT name=“Bari”> <GIIS>giis.ba.infn.it</GIIS> <GLOBUS>1.1.3</GLOBUS> <PERSON>Giorgio Maggi</PERSON> <CLUSTER> <GATEKEEPER>gris1.ba.infn.it</GATEKEEPER> <GRAM>fork</GRAM> <CPU units=“2”> <TYPE>Pentium III></TYPE> <OS>Linux RedHat 6.2</OS> <SPEED>500</SPEED> <RAM>256</RAM> <DISK>12</DISK> <NODE alloc=“WP1”>gris1.ba.infn.it</NODE> <NODE>gris2.ba.infn.it</NODE> </CPU> </CLUSTER> </UNIT> </ORGANIZATION> </GRID>



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Database Access

Database access is granted via web with HTTPS protocol and it is reserved to users owning a valid certificate.

Database and management tools are based on a multi-organizational architecture, i.e. all the resources of DataGrid testbed could be housed in a single database.

However, the choice between centralized and distributed approach has not yet been taken: this question is still subject of discussion.



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Database management tools

The main management tool is a java servlet, which uses a simple, non validating parser to access the XML file, and to convert it to an object tree.

It also generates a set of web pages which allow users to examine, add, remove and modify unit entries.



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Database management tools

Additional tools have been developed to search nodes with given characteristics, and to allocate them to a testing group.

All management tools have been implemented as java servlets, and tool access is restricted to users owning a valid certificate.



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Search Tool

A tool has been developed to search the database for nodes matching a given set of requirements.

In the current version, allowed search parameters are: Organization, CPU type and speed, memory size and disk space.



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Resource Allocation Tool

Another tool has been developed to allow marking a node as reserved to a given group for testing or working purposes.

The tool shows on a web page a list of available resources, similar to the list produced by the main management tool, but with an allocation button shown near each node.



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Resource Allocation Tool

The label on the button is “Allocate” if the node is currently free, or “Release” if it is currently reserved.

Clicking the button will swap the node status.



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What about DataGrid?



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What about DataGrid?May the INFN resource database and the tools be used for the whole DataGrid Testbed?

May the InfnGrid guidelines be generalized for DataGrid? - a proposal (where the Planning Group is replaced by a

Testbed Coordination Group, composed by 1-2 people for each national Testbed) has been submitted to the Integration Convergence Team (ICT) - comments by Federico Carminati - resent by FCA to WP8 TWG ** Need for discussion



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InfnGrid Testbed activities



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InfnGrid Testbed activities for 2001

Software environment, packaging

- Integration of various software components - Installation kit production - Experiments’ software environment installation some of the above activities are performed with WP4 and WP8

Grid services - Information Service MDS-2 tests (presentation in the MDS-2 session)

- Security, Certification and Authorization a draft document (“Authorization Service for Grid”) will be presented in the themed Security workshop



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Services and Working Groups

The GRID basic services Working Groups are:

- Information Service Participants: A. Cavalli, A. Bassi, L. Fonti , F. Semeria, G. VitaFinzi

- Security, Certification and Authorization Participants: R. Cecchini, R. Alfieri, L. Dell'Agnello, A. Gianoli, C. Rocca, F. Spataro

- INFNGrid installation kit and integration Participants: F. Donno, S. Barale, A. Cavalli, A. Chierici, A. Italiano, D. Mura, M. Serra



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Resource access policies and allocation for the tests - guidelines for the resource allocation - resource database and tools for search/allocation - tools for the automatic creation of grid-mapfiles

Monitoring - development of a simple monitoring tool for whole InfnGrid Testbed starting from the tools developed by the italian components of the LHC experiments (since WP3 tools will not be available in the short term).



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Support for Testbed activities: - by the site managers - by the grid services WGs - by the Installation kit group

Testbed resources validation Goal: check if the testbed resources are running properly Operational tests of: - grid software installation - batch systems - grid core services - networkIs this activity useful for DataGrid, too? Some preliminary discussions with S. Nicoud and E. Fedè, need for a decision.



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Validation Tools Proposal (A. Cavalli)

(cont.)

The tool could be done extending the features of the available MDS perl web browser.

It will retrieve the list of resources from the MDS.

Of each GRIS it will show:- Cpu model, speed, cpucount & Globus

version;- Time needed to gather information;- Published cpu load attributes;- RTT (just this for now from network);- Defined scheduler.

(*)

* dynamical values: the 1st depends on the others



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Validation Tools Proposal (2)

Join the tool developed in Torino (C++ program + some simple scripts) with this one to test the defined scheduler and show the results (open issue: a test user on all resources?).

Write some simple script to test GSI-ftp.

? Is it enough? Is there anything else that has to be checked?

? Is such a tool useful for DataGrid Testbed?

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