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Slajd 1

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... generate very high-resolution continuum and spectral-line images of cosmic radio ... sampled and stored locally, using high-capacity magnetic tape systems and ... – PowerPoint PPT presentation

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Title: Slajd 1


1
Workflow management in Remote Instrumentation
Infrastructures e-VLBI experiences
2
Outline
3
  • VLBI is a technique, in which physically
    independent and widely separated radio telescopes
    observe the same region of sky simultaneously, in
    order to generate very high-resolution continuum
    and spectral-line images of cosmic radio sources
  • Telescopes are usually separated by thousands of
    kilometres
  • Data from each telescope are digitally sampled
    and stored locally, using high-capacity magnetic
    tape systems and magnetic disk-array systems
  • Data are sent and correlated at the central point
    (JIVE)
  • The total flow of data into the central processor
    is approximately 10-100 Terabytes per single
    observation, after processing this is reduced to
    10-100 Gbytes.

4
RT4, Poland
Arecibo, Chile
Onsala, Sweden
5
(No Transcript)
6
408 Mhz
optical
1.4 Ghz
7
  • EXPReS the objective is to create a
    production-level electronic VLBI (e-VLBI)
    service, in which the radio telescopes are
    reliably connected to the central data processor
    at JIVE via a high-speed optical-fibre
    communication network.
  • Project Details
  • Three years, started March 2006
  • International collaboration
  • Funded at 3.9 million EUR
  • FP6, Contract 026642

8
Introduction
19 partners, 21 telescopes, 6 continents
9
  • EXPReS a Real-time e-VLBI Radio Telescope
  • - JRA1 Future Arrays of Broadband
    Radio-Telescopes on Internet Computing (FABRIC)
  • - Grid VLBI collaboration
  • - Grid Workflow management
  • - Grid Routing
  • Creating solution for incorporating Grid
    resources for distributed correlation using
    existing infrastructure.

10
Once upon a time (1)
  • Everything was slow
  • Telescopes collected data on tapes
  • Sent via postal mail
  • Hard drive arrays slightly improved the
    situation
  • The entire cycle could easily require 6 months
    or more

11
Once upon a time (2)
  • Hardware correlator the EVN MkIV data correlator
    at JIVE
  • dedicated, purpose designed/built hardware
  • a super computer 100 T ops/sec

12
Today / In the near future
  • Data can be transferred over the network
  • Each stage of the process can be speeded up
  • GRID resources
  • Software correlator

e-VLBI - electronic VLBI
13
System design data flows (1)
14
System design data flows (2)
15
WFM phase 1
  • Definition of radio telescopes automatically
    based on theobservation schedule

16
WFM phase 2
  • Definition of file servers (each file sever is
    responsible for capturing data from RT)

17
WFM phase 3
Definition of correlation nodes and data flows
between components
18
WFM properties
Definition of resource properties
19
  • RINGrid SSA project funded under 6th FP
  • Partners from UK, Austria, Greece,
    Italy,Romania, Bulgaria, Mexico and Brazil
  • RINGrid objectives
  • Identification of instruments and user
    communities, definition of requirements
  • Trends definition and recommendations for
    designing next-generation Remote Instrumentation
    Services
  • Promoting equal access to European
    e-Infrastructure opportunities

http//www.ringrid.eu/
20
Thank you for your attention
http//www.expres-eu.org/ d.stoklosa_at_man.poznan.pl
EXPReS is made possible through the support of
the EC, 6th FP, Contract 026642
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