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Title: The diverse use of clouds by CMS

The resources CMS is using are increasingly being offered as clouds. In Run 2 of the LHC the majority of CMS CERN resources, both in Meyrin and at the Wigner Computing Centre, will be presented as cloud resources on which CMS will have to build its own infrastructure. This infrastructure will need to run all of the CMS workflows including: Tier 0, production and user analysis. In addition, the CMS High Level Trigger will provide a compute resource comparable in scale to the total offered by the CMS Tier 1 sites, when it is not running as part of the trigger system. During these periods a cloud infrastructure will be overlaid on this resource, making it accessible for general CMS use. Finally, CMS is starting to utilise cloud resources being offered by individual institutes and is gaining experience to facilitate the use of opportunistically available cloud resources. Lastly, we present a snap shot of this infrastructure and its operation at the time of the CHEP2015 conference.
 [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [7] ;  [3] ;  [2] ;  [8] ;  [5] ;  [9]
  1. Univ. of Ioannina (Greece); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Imperial College London, London (United Kingdom)
  3. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  4. INFN-Bologna, Bologna (Italy)
  5. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  6. National Centre for Physics, Islamabad (Pakistan)
  7. Rutherford Appleton Lab., Didcot (United Kingdom)
  8. INFN-Padova, Padova (Italy)
  9. Chinese Academy of Sciences, Beijing (China)
Publication Date:
Report Number(s):
Journal ID: ISSN 1742-6588; 1414102
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 664; Journal Issue: 2; Conference: 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa (Japan), 13-17 Apr 2015; Journal ID: ISSN 1742-6588
IOP Publishing
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
OSTI Identifier: