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VGISC’s view VGISC Uses Cases Geneva October 2005

VGISC’s view VGISC Uses Cases Geneva October 2005. V-GISC’s view. Metadata and data provision The FWIS actors exchange metadata and data update to offer a unique view of the available meteorological data, Metadata and data access Discovery mode Request mode Subscription mode.

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VGISC’s view VGISC Uses Cases Geneva October 2005

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  1. VGISC’s view VGISC Uses Cases Geneva October 2005

  2. V-GISC’s view • Metadata and data provision • The FWIS actors exchange metadata and data update to offer a unique view of the available meteorological data, • Metadata and data access • Discovery mode • Request mode • Subscription mode

  3. real-time data feed

  4. V-GISC metadata feed

  5. Dataset located within the V-GISC

  6. Data located within GISCs

  7. Subscription to dataset located on the V-GISC

  8. Subscription to dataset not located on the V-GISC

  9. Users • Users • People • Group of people • System • Roles • Administrator • Registration officer • Operator • Data receiver (i.e. scientist or NC, etc) • Data provider (i.e. NC, GISC, etc) • Metadata provider (i.e. DCPC, NC, GISC, etc)

  10. Global Uses Cases

  11. Access Data and Metadata • Discovering: browsing a catalogue or launching a request.V-GISC returns a list of datasets with information like data origin, data location, data type • Retrieving: Quality of service mechanisms like request cost estimation and queuing mechanisms are used • Transfer: The data can either be pushed to the user (subscription) or pulled by the user (direct retrieve).

  12. Provide Data and Metadata

  13. Manage VO

  14. Manage V-GISC • An administrator can administrate the cache database • An administrator can administrate V-GISC nodes, stop and start them, modify their configuration

  15. Monitor V-GISC • Each V-GISC node is controlled at a local level • Administrators can perform operations similar to the operator’s ones but they have more privileges to perform deeper operations. They have access to the full software and can change, upgrade, patch the V-GISC nodes

  16. Security V-GISC needs to be able to authenticate the users (6.2) and provide an authorization model (6.3) to restrict access to datasets and functionalities of the system.

  17. OverviewPerformance: Where ? • First Tier (Store) Data feed of the VGISC (2.2.2.1 of the requirements) • Second tier (Get) • Access to the data • Data available • Pool of data on a time • Grid Technology • Data base Access • Third Tier (Forward) • Dissemination • Push mode • Pull mode • Shaping of the trafic • Fourth Tier (Remote) • Data feed of the remote application

  18. Product Valueand Dissemination • Value: Function of 2 parameters • Life expectancy of the product • The value goes down with the time • Elapsed time between 2 productions Ep • Max waiting delay for the product Dpm • Simple rule: Dpm = Ep/2 • Intrinsic value • Performance and Product value are linked • Performance on Third Tier (Forward) • Dissemination • Push mode • Pull mode • Life expectancy of the product • Managed with shaped diffusion channels: network response • Intrinsic value • Managed with priority queuing

  19. Shaped Diffusion Channels • MGB Flow Or Shaped Diffusion Channels: • Purpose • For each kind of products • Guarantee a time delay reception • All The global Throughput used as soon a channel runs • All the receivers don’t know those channels • Like CIR in Frame Relay • MGB Flow : the concept of MGB flow corresponds to the concept of CIR from the Frame-Relay protocol ; which means that the availability of a minimum bandwidth is guaranteed with the possibility of overload if the network requirements allow it.

  20. Example: BPMG Retim2000 Channels on W3A SatelliteThe product reception delay is garanteed • BPMG1 Alpha:Waiting max delay: 1 minute • Radome: warning messages • BPMG2 Fac:: Waiting max delay 1 minute 30 seconds • Mosaïcs Aspoc, radar + lightning • BPMG3 Alpha:Waiting max delay : 2 minutes • Radome turbo mode + data OPMET et urgent SMT data • BPMG4 Fac: Waiting max delay: 3 minutes • Radar (water cumul) • BPMG5 Fac: Waiting max delay: 5 minutes • Short scale analysis

  21. Example: QoS equipment • COTS • QoS equipment has to be set between the data source and the front-end. • It is in charge of traffic shaping • PacketShaper 2000 amongs different equipments : • best performances as it can manage both small / big data files (typically a few 100 bytes – a few 10 Mbytes), low / high data rates (64 kbps – a few 10 Mbps) • Market reference • Can deal with the different types of traffic used in the system : FTP, UDP unicast, UDP multicast, HTTP (and even SMTP, …) • CBR and CIR concepts are both managed • Very good observability (statistics) • Up to date technology to manage QoS : TCP rate control and Queuing combination

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