Monte Carlo Data Production and Analysis at Bologna LHCb Bologna

Computing Resources CPU Resources 150 CPUs for the period July-September 20*(866 MHz) + 30*(1 GHz) + 100*(1.4 GHz) After summer to be negotiated with CNAF, but >= 80 Disk Storage 2 TB of disk space served by two Network Attached Storage (NAS) disk servers

Data Analysis at Bologna Technical Issues NAS disk-servers used for production can’t be efficiently used for data analysis: Access time will dominate the processing time. Reading 1 TB of data would take 10 5 s at the NAS sustainable throughput of about 10 MB/s We plan to make use of a parallel file system implementation which stripes the data files among several I/O nodes, which would allow to reach order of MB/s over Fast- Ethernet

Data Analysis Concerns In order to allow full interactive sessions we would need to reproduce the CERN environment Another possibility could be to produce executables at CERN and then just move the binaries to make massive analysis (similarly to what happens with MC production). We have to establish the optimal sharing of the resources to be used by the production and the analysis tasks