VLBI Network “Quasar” – JIVE Network Performance Test

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VLBI Network “Quasar” – JIVE Network Performance Test Dmitry Marshalov, Ilya Bezrukov, Paul Boven

Рreparation of the VLBI Network “Quasar” to e-VLBI Update Mark5B+ network interfaces from 1 to 10 Gbps Test internal “Quasar” network performance Test external “Quasar” – JIVE network performance Joint e-VLBI observation with ENV

Install 10 Gbps NIC on Mark5B+ Mark5B motherboard: Intel® Server Board S5000VSA (PCIe v1.0 x4) https://www.intel.com/content/dam/support/us/en/documents/motherboards/server/s5000vsa/sb/d36978010_s5000vsa_tps_r1_9.pdf 10 Gb/s Network Adapter: Intel x520 (PCIe v2.0 x4) https://www.intel.ru/content/dam/doc/product-brief/ethernet-x520-server-adapters- brief.pdf Network Adapter driver: ixgbe-5.3.4 Network performance tool: iperf-3.3 https://software.es.net/iperf/

The results of measuring network performance Observatory LAN (TCP/UDP), Gbps IAA RAS SPb (UDP), Gbps Jive (UDP), Gbps Badary 5.77 / 1.55 1.51 1.53 Zelenchukskaya 5.76 / 1.79 1.74 1.75 In the tests, we used the standard value of maximum transmission unit (MTU) = 1500 bytes

Available bandwidth * planned in 2019 Station In/Out, Gbps IAA RAS SPb 4/4 (6/6)* Badary 2/2 Zelenchukskaya 0.1/2 Svetloe 0.1/0.1 (2/2)*

Statistics of data traffic utilization (all RT-32&RT-13) For the year 2017 For the day

Summary and future works The data transfer rate in Zc and Bd increased after upgrading Mark5B+ network interfaces. The network performance have been tested. Measured data rate between “Quasar” (Zc&Bd) stations and JIVE: more then 1.5 Gbps. In the near future it is necessary to carry out joint e-VLBI at 1 Gbps. When planning observations it is necessary to take into account high load of communication channels due to domestic e-transfer.