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OPTICAL ANSWERS TO GRID QUESTIONS

OPTICAL ANSWERS TO GRID QUESTIONS. Karen McPherson C.S. Major Radford University. SOURCE. “Grid-Controlled Lightpaths for High Performance Grid Applications"

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OPTICAL ANSWERS TO GRID QUESTIONS

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  1. OPTICAL ANSWERS TO GRID QUESTIONS Karen McPherson C.S. Major Radford University

  2. SOURCE • “Grid-Controlled Lightpaths for High Performance Grid Applications" • Authors: Raouf Boutaba, Wojciech Golab, Youssef Iraqi, Tianshu Li, and Bill St. Arnaud published by Kluwer Academic Publishers, 2004. • Information as well as quoted material is from this source.

  3. CONTENTS • Definitions • Introduction • Architecture • Security • Conclusion • Q & A

  4. Definitions • Wavelength Division Multiplexing: Technology by which optical lines are divided for traffic by wavelength • Dark fiber: Installed but unused fiber-optic cable • Lightpath Object: An abstraction of one or more lightpaths representing a connection between two or more switches

  5. Introduction • Question: What is the best network support for the data intensive nature of grids? • Answer: Optical networks

  6. Capacity & Cost • Optical networks provide the speed, reliability, and capacity ideal for huge data transfer • Emergence of new technologies such as WDM reduces cost of implementation • Existence of a great deal of currently available dark fiber reduces costs further

  7. Problem: Existing optical resource management systems – implemented over the internet - are too slow and unreliable • Solution: “User-Controlled Lightpath Management System”

  8. Administrator Customer Grid Application User Access Layer Service Provisioning Layer Resource Management Layer Physical Layer Cross-connect devices and lightpaths Architecture Figure 1. The User Controlled Lightpath Management System is represented by three main layers: User Access Layer (UAL), Service Provisioning Layer (SPL), and the Resource Management Layer (RML)

  9. User Access Layer (UAL) • Uses an HTML interface • Incorporates many XML and web based tools by implementing Java Web Services Developer Pack from Sun Microsystems • Main role is to translate user requests into operations on the services in the Service Provisioning Layer

  10. Service Provisioning Layer (SPL) • Consists of Globus Toolkit 3.0 and JBoss application server • XML based framework – application / platform independence • Maintains information on LPOs and users in a relational database • Main role is to provide services by manipulating Lightpath Objects (LPO)

  11. Resource Management Layer (RML) • Each cross-connect device is represented by a “Resource Agent” • Main role is to provide control over the individual devices • Incorporates the ability to customize system control with Java byte code • For example: creating your own monitoring policies

  12. SPL Services • These services - provided as grid services - manage the LPO resources • A Lightpath Object is just that – an object. It contains fields for: • a unique ID • the IDs of the current and previous owner • advertisement and lease expiry dates • a status indicating whether the LPO is reserved for use by the owner or has been advertised, partitioned, or concatenated and • bandwidth in kbps • hardware parameters

  13. SPL Services (cont) • CreateRootLPO: This is the basic service managed by the appropriate administrators and utilizes the root LPOs mentioned in the previous section • AdvertiseLPO and LeaseLPO: Ownership of lightpaths is transferred by means of “leasing” • PartitionLPO and ConcatenateLPO: These services are key in creating division and formation of lightpath bandwidths

  14. SPL Services (cont) • AccessLPO: This service prepares a particular path for data traffic • ReconfigureLPO: This service is used for lightpath access policy control • EstablishEndToEndLPO: This service uses those above to form lightpaths, i.e., forming a path of a specific bandwidth between specific endpoints

  15. Security • The foundation of the security defense presented by this research is achieved by capitalizing on the Grid Security Infrastructure (GSI) supplied by Globus Toolkit 3.0

  16. GSI Security • mutual authentication - based on public key encryption and Secure Socket Layer • transport layer security - httpg • message layer security - XML encryption

  17. Custom Security • GSI insufficient to deal with user privileges in this lightpath management system • Researches implemented an additional, separate authorization mechanism • Implementing their own control allowed the researchers to add a customization feature to this authorization.

  18. Conclusion • The solution offered by “Grid-Controlled Lightpaths for High Performance Grid Applications” does appear to confirm optical answers to grid questions • The solution delivers grid level data transfer at a realistic cost • The management offered by this research also seems to address grid needs - by using a “grid-centric” approach such as the services provided in the SPL, this system may be utilized by grid applications in a very innate way

  19. Q & A

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