Networking for grid Network capacity Network throughput 13-12-2002 Network capacity Network throughput What you get Network monitoring Datagrid tutorial

Network capacity GEANT: European research network 13-12-2002 GEANT: European research network Backbone 10 Gbit/s (6 POP’s) National research networks from 34 Mbit/s up to 2.5 Gbit/s Across the Ocean 2.5 Gbit/s Research on Optical networks (lambda’s) Netherlight, Starlight, Datatag Links between CERN, Amsterdam, Chigaco Datagrid tutorial

GEANT backbone topology 13-12-2002 Datagrid tutorial

GEANT global access 13-12-2002 Datagrid tutorial

Network throughput TCP performance System performance 13-12-2002 TCP performance Window size > bandwidth * RTT With 1 Gbit/s and RTT =20ms >2.4 Mbyte Recovery of lost packets Different protocal stacks congestion avoidance (ECN) Measured with iperf, netperf System performance Adapter System bus Disk access Datagrid tutorial

Application throughput 13-12-2002 GridFTP Extension of FTP standard Security Multiple streams Multiple disk stripes Datagrid tutorial

Network monitoring Pinger for RTT’s 13-12-2002 Pinger for RTT’s RipeNCC TTM boxes for link latencies or delays Iperf for TCP network throughput RTPL for TCP network throughput (netperf) UDPmon for network throughput GridFTP logs for application throughput Datagrid tutorial

Network monitoring http://gridmon.sara.nl/ 13-12-2002 http://gridmon.sara.nl/ http://ccwp7.in2p3.fr/main.html Monitoring data used for Statistics Diagnostics Enable efficient data transport (network cost function) RIPENCC TTM: NIKHEF – RAL 01-08/12 Iperf: CERN production testbed  Lyon en INFN Datagrid tutorial

Network monitoring Mapcenter : Mapcenter 13-12-2002 Mapcenter : presentation layer for grid information MDS data, sensor data Mapcenter RIPENCC TTM: NIKHEF – RAL 01-08/12 Iperf: CERN production testbed  Lyon en INFN Datagrid tutorial

Network performance Not discussed: 13-12-2002 Not discussed: Other network protocols (replacement for TCP) QoS Interactive applications Communication of distributed applications RIPENCC TTM: NIKHEF – RAL 01-08/12 Iperf: CERN production testbed  Lyon en INFN Datagrid tutorial