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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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)

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME 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

Distributed Aircraft Maintenance Environment - DAME