Speaker
Mr
M. Grigoriev
(FERMILAB, USA)
Description
Large, distributed HEP collaborations, such as D0, CDF and US-CMS,
depend on stable and robust network paths between major world
research centers. The evolving emphasis on data and compute Grids
increases the reliance on network performance.
FermiLab's experimental groups and network support personnel
identified a critical need for WAN monitoring to ensure the quality
and efficient utilization of such network paths. This has led to the
development of the Network Monitoring system we will present in this
paper.
The system evolved from the IEPM-BW project, started at SLAC two
years ago.
At Fermilab it has developed into a fully functional infrastructure
with bi-directional active network probes and path characterizations.
It is based on the Iperf achievable throughput tool, Ping and Synack
to test ICMP/TCP connectivity, Pipechar and Traceroute to test,
compare and report hop-by-hop network path characterization, and
real file transfer performance by BBFTP and GridFTP. The Monitoring
system has an extensive web-interface and all the data is available
through standalone SOAP web services or by a MonaLISA client.
Also in this paper we will present a case study of network path
asymmetry and abnormal performance between FNAL and SDSC which was
discovered and resolved by utilizing the Network Monitoring system.
