Speaker
Dr
Niko Neufeld
(CERN)
Description
Events selected by LHCb's online event filtering farm will be assembled into raw
data files of about 2 GBs. Under nominal conditions about 2 such files will be
produced per minute. These files must be copied to tape storage and made
available online to various calibration and monitoring tasks. The life cycle and
state transitions of each files are managed by means of a dedicated data-
base. Transfer of the files to permanent storage is using the Data Management
System of DIRAC, slightly adapted for the purposes of the Online system. Once
files are copied to CERNs mass-storage, replication to the LHCb Tier1 centres is
initiated.
This system has been designed for extreme robustness and reliability with
redundance in almost every component and various failover mechanisms. The
software, hardware and protocols designed for this purpose will be discussed in
detail. Performance figures of data- challenges done in Spring 2007 will be
shown.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | LHCb Online |
|---|
Primary author
Dr
Niko Neufeld
(CERN)
