Computing Resources of NERSC

1
Computing Resources of NERSC

• Kam-Biu Luk
• University of California, Berkeley
• and
• Lawrence Berkeley National Laboratory
• KamLAND DOE Review at Caltech

2
NERSC at LBNL

• Computing facilities of NERSC (National Energy
  Research Scientific Computing Center)
• HPC facility
• HPSS (High Performance Storage System)
• PDSF (Parallel Distributed Systems Facility)

3
HPSS of NERSC

• 18 TB of disk cache, and 2 PB of tape storage
• Users can save and access files that are large
  and infrequently used
• Currently, only 0.2 PB of the tape storage is
  used
• Usage is charged based on Storage Resource Units
  (SRUs)
• SRUs 0.0012 ? files 0.4 ? space (GB)
  4.0 ? I/O (GB)
• In every fiscal year DOE's Office of Science
  provides NERSC with storage allocations for each
  project funded through the ERCAP process
• NERSC does not save duplicate copies of HPSS files

4
PDSF of NERSC
Gb E-link
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KamLAND Utilization of NERSC

• Long-term archive of data with HPSS
• Study showed that 100-GB of data can be moved to
  PDSF from disk to disk in 7 hours with a 100
  based-T link between LBNL and NERSC in Oakland
• Currently use a LTO-tape robot on loan from IBM
  to NERSC to upload data to HPSS at NERSC
• Looking into the possibility of setting up the
  LTO tape-reading
• system at NERSC in Oakland this will allow
  one-tape worth of
• data be uploaded to PDSF/HPSS in about 3
  hours.
• Reprocessing raw data if there is a need

LTO Tape Drive with Stacker
PDSF
HPSS
PC with Stage Disks
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Summary

• Request enough SRUs for archiving KamLAND data
  in HPSS
• Establish a long-term tape-copying system with
  high through-put
• Strengthen the computing resources at PDSF for
  KamLAND
• contribute CPUs based on need
• contribute enough disk space