Pooling the resources of the CMS Tier-1 sites

Apyan A., Badillo J., Cruz J. D., Gadrat S., Gutsche O., Holzman B., ...More

21st International Conference on Computing in High Energy and Nuclear Physics (CHEP), Okinawa, Japan, 13 - 17 April 2015, vol.664 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 664
  • Doi Number: 10.1088/1742-6596/664/4/042056
  • City: Okinawa
  • Country: Japan
  • Çukurova University Affiliated: Yes


The CMS experiment at the LHC relies on 7 Tier-1 centres of the WLCG to perform the majority of its bulk processing activity, and to archive its data. During the first run of the LHC, these two functions were tightly coupled as each Tier-1 was constrained to process only the data archived on its hierarchical storage. This lack of flexibility in the assignment of processing workflows occasionally resulted in uneven resource utilisation and in an increased latency in the delivery of the results to the physics community.