Monte Carlo Data Production and Analysis at Bologna

1
Monte Carlo Data Production and Analysis at
Bologna

• LHCb Bologna

2
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 gt
  80
• Disk Storage
• 2 TB of disk space served by two Network
  Attached Storage (NAS) disk servers

3
Data Analysis at Bologna

• Technical Issues
• NAS disk-servers used for production cant be
  efficiently used for data analysis
• Access time will dominate the processing time.
• Reading 1 TB of data would take 105 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 100-200 MB/s over Fast-Ethernet

4
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