Speaker
A. Bobyshev
(FERMILAB)
Description
The Compact Muon Solenoid (CMS) experiment at CERN's Large Hadron Collider (LHC) is
scheduled to come on-line in 2007. Fermilab will act as the CMS Tier-1 center for the
US and make experiment data available to more than 400 researchers in the US
participating in the CMS experiment. The US CMS Users Facility group, based at
Fermilab, has initiated a project to develop a model for optimizing movement of CMS
experiment data between CERN and the various tiers of US CMS data centers. Fermilab
has initiated a project to design a WAN emulation facility which will enable
controlled testing of unmodified or modified CMS applications and TCP
implementations locally under conditions that emulate WAN connectivity. The WAN
emulator facility is configurable for latency, jitter, and packet loss. The initial
implementation is based on the NISTnet software product. In this paper we will
describe the status of this project to date, the results of validation and comparison
of performance measurements obtained in emulated and real environment for different
applications including multistreams GridFTP. We also will introduce future short term
and intermediate term plans, as well as outstanding problems and issues.
