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Sarfraz A Nadeem University of Leeds

Towards the Design and Implementation of the DAME prototype: OGSA Compliant Grid Services on the White Rose Grid. Sarfraz A Nadeem University of Leeds. An Overview. Distributed Aircraft Maintenance Environment White Rose Grid v/s Virtual Organisation OGSA compliant Grid Services

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Sarfraz A Nadeem University of Leeds

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  1. Towards the Design and Implementation of the DAME prototype:OGSA Compliant Grid Services on the White Rose Grid Sarfraz A Nadeem University of Leeds

  2. An Overview • Distributed Aircraft Maintenance Environment • White Rose Grid v/s Virtual Organisation • OGSA compliant Grid Services • Grid Services on the White Rose Grid • XTO analysis tool • XtoAnalysis Grid Service • Plotting Charts

  3. DAME: Distributed Aircraft Maintenance Environment • Pilot project funded by the UK e-Science core program • Aims at research, business and contribution towards Grid technologies • To facilitate the diagnostic and maintenance of an aircraft engine in a distributed fashion • To reduce the cost of an unexpected and unplanned maintenance of an aircraft engine

  4. WRG: White Rose Grid • A Virtual Organisation (VO): • Transparent access to Grid resources • No worries about physical location of resources • Interested only in attributes and availability • WRG is a practical example of VO: • Comprises high performance resources • Resources are diverse in nature • Subject to local administration, access control and security policies

  5. OGSA Compliant Grid Service Factory Approach • A Factory Service is a secure and stateless persistent service • Knows how to create instance(s) of transient, possibly stateful service • Grid Service Handle (GSH) is just a URI that points to a Grid Factory Service • Clients contact Factory Service and request to instantiate the service instance • Factory Service returns Grid Service Reference • If SOAP binding is used, GSR is just a WSDL document • GSR / WSDL document explains Grid Service information such as available methods and message types

  6. XTO Grid Factory Services on the WRG • XtoQuery Grid Service is designed to retrieve information from a MySQL database against input parameters • XtoAnalysis Grid Service analyses aircraft engine data and uses gsiftp for: • Transfer of XTO analysis tool • Transfer of ZMOD/binary data • Transfer of XTO output data • XtoChart Grid Service plots chart using XTO output data and uses GridFTP for: • Transfer of XTO output data • Transfer of plotted chart in PNG/JPG format

  7. XTO Analysis Tool • XTO is a framework • Plug-ins perform the analysis job • Plug-ins are specialised piece of software • Four plug-ins are in use with current version • 20 tracks / features are extracted: • 2 by the framework • 18 by the plug-ins: • Fractional (3) • Multiple (11) • Residual energy (1) • Step change (3)

  8. XtoAnalysis Grid Service (1) • Two file are created during the transfer of XTO analysis tool to compute resource: • XTO configuration file • XTO feature detector summary file • This relies on: • A shell script • User defined variables • Variables define in Globus • An RSL script

  9. XtoAnalysis Grid Service (2) • RSL provides a common interchange language to describe resources • User defined variables are used to construct an RSL script dynamically • This RSL script outlines the job request • Job request is parsed and processed by GRAM • GASS server is used to run this scripted job

  10. XtoChart Grid Service: Plotting Charts • XtoChart Grid Service plots chats: • From XTO output data • Using a public domain package customised to handle XTO output data • GridFTP is an optimised, high-performance, secure, reliable data transfer protocol • Used to transfer: • XTO output/XtoChart input data to Grid Service hosting machine • Chart image from Grid Service hosting machine

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