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SRB Services

SRB Services. Introduction. An Overview of SRB CCLRC and SRB Case Study: e-Minerals Mini-Grid SRB Production Services Questions. Managing Data. Historically data has been STORED rather than MANAGED Problems arising from this include: Scaling Distribution

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SRB Services

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  1. SRB Services

  2. Introduction • An Overview of SRB • CCLRC and SRB • Case Study: e-Minerals Mini-Grid • SRB Production Services • Questions

  3. Managing Data • Historically data has been STORED rather than MANAGED • Problems arising from this include: • Scaling • Distribution • Access Control, Authentication, Security • Data Migration • Data Curation

  4. What is SRB? • Storage Resource Broker (SRB) is a software product developed by the San Diego Supercomputing Centre (SDSC). • Allows users to access files and database objects across a distributed environment. • Actual physical location and way the data is stored is abstracted from the user • Allows the user to add user defined metadata describing the scientific content of the information

  5. MCAT Database c d MCAT Server b e f SRB A Server SRB B Server g a SRB Client How SRB Works • 4 major components: • The Metadata Catalogue (MCAT) • The MCAT-EnabledSRB Server • The SRB Storage Server • The SRB Client

  6. The MCAT Database • The MCAT database is a metadata repository that provides a mechanism for storing information used by the SRB system. • Includes both • Internal system data required for running the system • Application (user) metadata regarding data sets being brokered by SRB.

  7. The MCAT Server • At least one SRB Server must be installed on the node that can access the MCAT database. This is known as the MCAT-Enabled SRB Server. • MCAT SRB Server works directly against the MCAT database to provide SRB Services • All other SRB Servers interact through the MCAT Server

  8. The SRB Server • The SRB Server is a middleware application that accepts requests from clients and obtains/queries/manages the necessary data sets. • It queries the MCAT SRB Server to gather information on datasets and supplies this back to the SRB client.

  9. SRB Client Tools • Provide a user interface to send requests to the SRB server. • 4 main interfaces: • Command line (S-Commands) • MS Windows (InQ) • Web based (MySRB). • Java (JARGON) • Web Services (MATRIX)

  10. Concepts • Location: A physical node running an SRB Server • Physical Resource: A storage area managed by an SRB Server • Logical Resource: One or more Physical Resources – can be distributed • Collection – Data abstraction of resources

  11. C, C++, Linux I/O Unix Shell SRB Databases DB2, Oracle, PostgreSQL Archives ADS, HPSS, ADSM,DMF File Systems Unix, NT, Mac OSX SRB in Detail Application Resource, User Java, NT Browsers Prolog Python Third-party copy Web User Defined Remote Proxies MCAT HRM DataCutter Application Meta-data

  12. Administration • Users / Locations / Resources must be managed • Two methods for doing this: • Java MCAT Admin Tool • Command line tools

  13. CCLRC and SRB • The Data Management Group in CCLRC started working with SRB in November 2002 after a fact finding mission to the USA. • There was an immediate requirement for a storage based product that allowed the addition of searchable metadata • Generated lots of internal interest, which led to a number of projects with SRB

  14. SRB Example: CMS • Largest project using CCLRC SRB services to date is the CERN CMS experiment. • SRB chosen for ‘Pre-Challenge Production’, producing data for Data Challenge 2003/2004 (DC03/DC04) • Need to prove data can be transferred, replicated and stored at LHC rates • DC04 provided key input to SRB Version 3.2

  15. SRB Case Study: e-Minerals • UK e-science project for modelling the atomistic processes involved in environmental issues

  16. e-Minerals Requirements • Data Management Requirements • Scientists want to store input and output files from simulations in different locations • manage their own files/data via the web • give access to other project members • give temporary access to others

  17. Cambridge Reading SRB Resource Bath SRB Resource SRB Resource Architecture Web Browser DaresburyApp Server Application server runs SRB software MySRB Eminerals MiniGrid UK Grid SRB Server Oracle Client Database server holds locations of files Daresbury Database server MCAT

  18. Building on Experience - New Services • CCLRC SRB Service • Initial service availability: October • Proposed Customers include: • ISIS Facility, British Atmospheric Data Centre (BADC), AHDS • ADS interface (with Containers) • Test systems in place • NGS SRB Service • e-Minerals, e-Materials, Integrative Biology

  19. SRB Services • SRB version 3.2 • Performance, scalability and reliability • Ongoing Service Enhancements • Automatic failover • Product Documentation and Training - Collaboration with SDSC

  20. Summary • Links established with SRB community and SDSC • Real SRB projects implemented • Creating new generation of SRB Production Systems • Can help community with: • SRB Test Systems • SRB Production Systems • SRB Training and Support • Contributing to future versions

  21. Questions • ?

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