DEVELOPMENT OF IT TECHNOLOGIES FOR SCIENTIFIC EXPERIMENTS WITH RUSSIAN SPACE TELESCOPES Shatskaya M, Abramov A., Fedorov N., Kostenko V., Likhachev S., Seliverstov S., Sichev D. AstroSpace Center, P. Lebedev Physical Institute, RAS, Moscow, Russia P.N.Lebedev Institute Astrospace Center

Data processing center for space VLBI project Radioastron. July 2011 Now working project. Data processing center for space VLBI project Millimetron. Future project. P.N.Lebedev Institute Astrospace Center

The aims of Data Processing Center Radioastron project The aims of Data Processing Center Organization of service information exchange. Collection and storage of all scientific information of observations. Processing of scientific observation data. P.N.Lebedev Institute Astrospace Center

Data Transferring Service information Scientific Data Radioastron project Service information Scientific Data Coordination of schedule, cyclogramas, observations reports, telemetric data, orbit data and others Data of observation from telescopes on-line and prompt delivery of data delivery with delay from a day to 0.5 year Uninterruptible service of the all systems: communication channels, the server high availability and efficiency, High quality of channels (UDP) Redundancy of delivery (telemetric data is delivered via 2 channels by UDP and via Internet by TCP) but small volume of data (less than 3 TB on 6 years period). Low capacity of communication channels (2 Mb/c), Large volume of data High capacity of communication channels and servers but High demands on the efficiency and uninterrupted operation are not imposed

More Than 40 Ground Telescopes Radioastron project GBT USA Medicina Italy Tidbinbilla Australia Urumqi China Noto Italy Arecibo Puerto Rico Usuda Japan Westerbork the Netherlands ATCA Australia Effelsberg Germany Hart Africa Svetloe Russia Robledo Spain Yebes Spain Badary Russia Zelenchuk Russia Onsala Sweden Jodrell Bank UK Parks Australia Torun Poland Shanghai China et al.

Features of DPC of Radioastron project Standard VLBI Radioastron Processing Center Equipment MARK5, disc packs Computers, servers Network, channels GEANT, high speed dedicated channels, delivery on disc packs Public Internet 600 Mb/s Sometime delivery on discs Protocol JIVE5ab Tsunami, ftp Deleting of raw data yes no

Structure of Data Processing Center Radioastron project Total amount of data in Processing Center 2700 TB

Data Processing Center Radioastron project P.N.Lebedev Institute Astrospace Center

Expected July 2011 Nowadays 2017 Radioastron project Expected July 2011 Nowadays 2017 Ground Telescopes 5 40 Worked Simultaneously 2-3 Up to 30 Tracking stations Pushchino Pushchino + Green Bank Number of observations per month 20 120 Storage 100 TB 1 PB on line 6 PB off line DAS Direct Attached Storage NAS Network Attached Storage Dividing of processes of data collecting and archiving and processing Deleting raw data Yes No

Radioastron project Spontaneous growing of storages and amount of computer technique, reprocessing of data overflow of: heating weight of equipment space of server room.

New server room Weight of equipment 6000 kg 8 server racks Radioastron project Weight of equipment 6000 kg 8 server racks Input electric power 80 kW with redundancy Fire-extinguishing system Scalable cooling system

Deformational Model Radioastron project We carried out investigation and calculation of safe load carrying ability of the floor.

Distribution of Weight Radioastron project We laid special cover of the floor and metal frame for distribution of weight.

Data Processing Center of Millimetron Project Space telescope Control stations Tracking station Ground telescopes Data processing center Center of experiment planning Ballistic center Tracking headquarters Scientific centers and users

Amount of Expected Information Millimetron project Total amount from tracking stations and 3 ground telescopes: 150 PB per year According to 2014 Technological Workshop in Groningen 80 PB per 5 years

Data Center for Millimetron Project Appropriate room or special building with protection from leaking and fire-extinguishing system Redundant power supply Independent power supply (diesel generator) Uninterruptible power supply Air-conditioning on N + 1 systems Video surveillance and monitoring of all systems Room for operators Communication channels Expected parameters: Data 150 PB per year Electric power about 1.3 MW 60 racks 500 - 600 m2 40 Gb/s 100 Gb/s Millimetron project

Conclusions Operation of Data Processing Center for Radioastron project is not standard for VLBI, nevertheless DPC fully adequate to requirements of the Mission. DPC is dynamic and growing system. Nowadays we are working on planning and calculation of parameters of DPC for Millimetron project. Our experience of Radioastron will be useful for our next project "Millimetron“.

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