Speaker
Dr
Lee Lueking
(FERMILAB)
Description
The CMS experiment at the LHC has established an infrastructure using the FroNTier
framework to deliver conditions (i.e. calibration, alignment, etc.) data to
processing clients worldwide. FroNTier is a simple web service approach providing
client HTTP access to a central database service. The system for CMS has been
developed to work with POOL which provides object relational mapping between the C++
clients and various database technologies. Because of the read only nature of the
data, Squid proxy caching servers are maintained near clients and these caches
provide high performance data access. Several features have been developed to make
the system meet the needs of CMS including careful attention to cache coherency with
the central database, and low latency loading required for the operation of the
online High Level Trigger. The ease of deployment, stability of operation, and high
performance make the FroNTier approach well suited to the GRID environment being used
for CMS offline, as well as for the online environment used by the CMS High Level
Trigger (HLT). The use of standard software, such as Squid and various monitoring
tools, make the system reliable, highly configurable and easily maintained. We
describe the architecture, software, deployment, performance, monitoring and overall
operational experience for the system.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | CMS Offline Data Management Group |
|---|
Primary author
Dr
Lee Lueking
(FERMILAB)
Co-authors
Dr
Barry Blumenfeld
(Johns Hopkins University)
Dr
David Dykstra
(Fermilab)
Dr
Eric Wicklund
(Fermilab)
