e-EVN: practical considerations

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Presentation transcript:

e-EVN: practical considerations Arpad Szomoru

Outline Work packages Currently underway Next

Work packages Standard e-VLBI correlator mode: Wall-clock time vs ROT Centralized control Rapid response/ToO functionality: Real-time monitoring/feedback/analysis On-the-fly adjustment of observational/correlator parameters Improved amplitude calibration Data transport issues Guaranteed (high) bandwidth Transport protocols (modified TCP, UDP-based, VSI-e…) Hardware issues New control computers (reliability, speed) Replacement of SUs (ageing, failing, rusting, unmaintainable, unfixable…) Networking hardware (router, interfaces)

e-VLBI correlator mode: control interfaces

Monitoring tools: Integrating fringe display

Monitoring tools: Data status monitor

Rapid adjustment of correlator params: vex editor

(near) Real-time analysis: streamlining of post processing

Web-based Post-processing

Current/future development Telescope status monitor Compilation of available telescope information Adaptive scheduling Capability to change order or length of observation of sources during experiment Wb-based amplitude calibration EVN calibration data not necessarily up-to-date Logistical effort Not only useful for e-VLBI (e.g. polarisation calibration)

1 Gbps 10 Gbps 155 Mbps 2.5 Gbps

Connectivity in/to China 1 G 2.5 G 155 M 100 M 50 M 34 M HKOEP ORIENT: 2.5 G TEIN2: 622 M SURFNet

Connectivity improvements: Protocols: Vlbi-udp under development in Manchester (Richard Hughes-Jones, Ralph Spencer & collaborators) TCP modifications (Sansa, Kettenis). Issues with Mark5A code and newer Linux kernels VSI-e. Needs Mark5B.. Other protocols (tsunami?) Lightpaths across Europe Affordable (probably for free) and available right now Easily expandable

Hardware New control computers Solaris AMD servers, redundant power supplies Interchangeable for maximum reliability Cut down dramatically on (re-)start time Removal of single points of failure Mark5 upgrade: Motherboards, memory, power supplies Mark5A→B: serial links, CIBs

Network upgrade at JIVE: SX optics, router GÉANT Mk5 N GE Lightpath 16 GE Lightpath OME network OME network Router Mk5 Mk5 Dynamic capabilities through DRAC 10 G IP IP/Lightpath Production e-VLBI via lightpaths Mk5