Implementation Challenges (2)

• Heterogeneity

  • Operating systems (well understood)
  • MSS - HPSS, Castor, Enstore, JasMINE
  • Disk systems – system attached, network attached, parallel

• Optimization issues

  • avoid extra file transfers - What to keep in each disk cache over time
  • How to maximize sharing for multiple users
  • Global optimization
  • Multi-Tier storage system optimization

• Space allocation

  • How much to allocate if file size is unknown
    • Default – not practical
    • Incremental – needs dynamic monitoring of file transfers

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