1. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Castor development status Alberto Pace LCG-LHCC Referees Meeting, May 5 th, 2008 DRAFT FOR COMMENTS http://indico.cern.ch/conferenceDisplay.py?confId=27533

2. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Castor status The current version of Castor is able to sustain the dataflow from the experiments –Data migration to tapes –Data replication to Tier 1s A new consolidated version (2.1.7) is released –Several bug fixes –Better logging

3. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Areas of improvement Castor Security –Partially implemented since 2.1.6, complete implementation in progress –Deployment expected 2 nd half 2008 Tape area –Avoid interferences between end-user file requests (recall of data from tape) and the main experiment data streams and replications Tape requests will be prioritized –Tape prioritization will guarantee production it may have a performance impact on the end-users wishing to recall files for analysis

4. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Impact on future analysis We are thinking of possible architectures to ease future data analysis –avoid on-demand file recalls, concept of “datasets”, recent data always on disk –client protocol status and evolution –impact of strong authentication on scalability –Accessibility of internal performance counters An architecture working group is working on these questions –Some proposals are expected before this summer –See D. Duellmann presentation at Hepix this Wednesdaypresentation