Erik Mattias Wadenstein
Jose Flis Molina
Pierre Emmanuele Brinette
* Name and Scope
No objections to combining the two "triggers" within the same group.
optimal use of tape systems
knowledge-sharing forum for operators
Focus is tape systems for archival use.
This will expand if the group wishes to include
tape for non-archival use
non-tape for archival use
We are flexible.
Discussion on name and scope. No alternative name received much approval, so keep the existing one and explain the scope in the group twiki.
* Optimal exploitation of archival resources (Oliver)
Proposal to collate "best practise for experiments" from each archival site. This should include all necessary advice to allow users (experiments, FTS, ...) to optimally exploit the storage system.
Decision - do one iteration of this and schedule review at next meeting.
Action - Oliver to create necessary space and send invitations to contribute.
FTS and monitoring -
FTS represents a potential common client which can produce comparable metrics between experiments and sites.
No further feedback, but we need to check how to access FTS staging analysis in the absence of a CERN account.
* Summary of HEP sites configuration (Vlado)
Overview of current situation, discussion on what the group could report.
Can this data be refreshed e.g. once per month?
For the summaries, are we considering HEP data or LHC data?
What does capacity mean?
total media capacity, also if empty.
pledge is OK too.
NB - the WLCG resource reporting group is interested in getting used capacity for tape systems, to support experiment operations and storage accounting. This can be discussed at a future meeting.
Action - Vlado to circulate URL of the twiki we will build for the group.
Action - Vlado to propose a platform for collection of metrics
* BNL view on the metrics (by David Yu)
Sharing "remount" information. Can we share (per VO)
number_of_unique_vols_mounted_in_a_day / total_mounts
Are we reporting binary or decimal prefixes?
Decision - decimal.
Utility of sharing these metrics
- see if changes we make are improving things
- help sites understand their own performance by comparing with others
What about deleted data?
Some sites can remove deleted data volume from totals
at CERN this is hard
should bytes used include this or not??
to be further clarified.
How should data be aggregated in distributed sites?
Average across whole site?
* Next steps
Next meeting to be scheduled when the first round of information gathering is complete
Regular reporting to HEPiX encouraged