High energy & nuclear physics

It has long been forgotten!!!

• It has long been forgotten!!!

• Though it is a key issue!

• Issues

• indexing
• retrieval
• replication
• caching
• traceability
• (auditing)

• And security!!!

Grids lack most of the tools mandatory to share (index, search, access), analyze, secure, monitor semantic data (information)

• Grids lack most of the tools mandatory to share (index, search, access), analyze, secure, monitor semantic data (information)

• Several reasons

• history
• money
• difficulty

• Why is it so difficult?

• Sensitivity but openness
• Multiple administrative domains, multiple actors, heterogeneousness but a single global architecture/view/system
• Dynamicity and unpredictability but robustness
• Wideness but high performance

Maintain a mapping between logical names for files and collections and one or more physical locations

• Maintain a mapping between logical names for files and collections and one or more physical locations

• Decide what, where and when a piece of data must be replicated

• Important for many applications

• Example: CERN high-level trigger data

• Multiple Petabytes of data per year
• Copy of everything at CERN (Tier 0)
• Subsets at national centers (Tier 1)
• Smaller regional centers (Tier 2)
• Individual researchers have copies of pieces of data
•