What happens at SLAC?
Cannot store everything on disk
- Maybe 10 Tb, but not 1 Pb.
- Already buying ~1 Tb disk per month.
Analysis requires frequent access to summary information.
- Keep tag and “microDST” on disk
- More information for most interesting events on disk
- Rest in mass store (HPSS at SLAC)
In future even this may not be enough
- Only tag and “dataset of the month” on disk?