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AliEn

AliEn. AliEn at OSC The ALICE distributed computing environment by Bjørn S. Nilsen The Ohio State University. Contents. Brief history. Present status. Capabilities. Integration with other Grid activities. Development time line. 6/01 Simple File Data-base proposed.

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AliEn

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  1. AliEn AliEn at OSCThe ALICE distributed computing environmentbyBjørn S. NilsenThe Ohio State University

  2. Contents • Brief history. • Present status. • Capabilities. • Integration with other Grid activities.

  3. Development time line 6/01 Simple File Data-base proposed. 7/01 Need to do ALICE Computing for PPR. 9/01 Globus/EDG Far from ready to use. 11/01 First AliEn prototype ready. 12/01 First Simulation Production Runs done. 3/02 Need to get access to production data. 6/02 First general distributed computing environment ready.

  4. AliEn World Wide Installations Columbus San Francisco

  5. AliEn supplies • User Environment (Shell like environment). • Resource Broker (available computing and storage). • Meta data Catalog (input and output files). • Replica Manager (multiple copies of files). • Authentication (login services).

  6. Remote Compute/Storage Site • Requests job to do. • Executes job received. • Returns job status. • Sends data to final storage. • Remote Compute/Storage Site • Requests job to do. • Executes job received. • Returns job status. • Sends data to final storage. • Remote Compute/Storage Site • Requests job to do. • Executes job received. • Returns job status. • Sends data to final storage. • Remote Compute/Storage Site • Requests job to do. • Executes job received. • Returns job status. • Sends data to final storage. AliEn Computing Model • Central Server • Accepts Job Request. • Determines Resource locations. • OK’s Jobs to be run on sites. • Updates status and new file locations User Submits job request.

  7. ComponentsAvailable in RPMs • AliEn-Base Contains external modules (more than 100, including Globus). • AliEn-Client Basic client functionality, needed to access LFNs. • AliEn-Server Serves Virtual Organization (one per). • AliEn-SE (Storage Element) Provides Mass Storage services at a site. • AliEn-CE (Compute Element) Provides Compute services at a site. • AliEn-GUI Optional package. • AliEn-Monitor Required by Server package to provide advanced RB features. • AliEn-Portal Provides AliEn Web site. • AliEn-Alice (Atlas) Provides specific virtual organizations with default settings.

  8. AliEn to do List • C/C++ API (January) • Performance evaluation (ADC IV) • Populating tags (January) • Extracting part of data stream for monitoring and partial reconstruction outside CERN (February) (=> postponed) • GSI/Globus certificate authentication (March) • Adding new services • Monitoring and exception handling (February = prototype) • Queue optimization (March) • Support for arbitrary user jobs (April) • Disk pool/cache manager (January => postponed) • ROOT interface (April) • Virtual datasets (May => August) • Modular “kernel” using POE (?) • Use Condor ClassAds for resource description and matching(February)

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