On-line data requirements

• Goddard Space Flight Center Distributed Active Archive Center, Greenbelt, MD

  • supports Earth Observing (EOS) science datasets
  • about 600 TB ordered per month in 1995
  • peak of 250 TB ordered per hour in 1995.
  • users tend to reference files just created or files created a long time ago (over 3 months)
  • close to 4,000 tape mounts per week
  • about 50 files transferred per tape mount

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