The Diverse use of Clouds by CMS

[摘要] 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. We present a snap shot of this infrastructure and its operation at the time of the CHEP2015 conference.

[发布机构] University of Ioannina, Greece^1;Blackett Laboratory, Imperial College London, London; SW7 2AZ, United Kingdom^2;CERN, Geneva 23; CH-1211, Switzerland^3;INFN-Bologna, Viale Berti-Pichat 6/2, Bologna; 40127, Italy^4;Fermilab, Batavia; IL; 60510-5011, United States^5;National Centre for Physics, Islamabad; 45320, Pakistan^6;Rutherford Appleton Laboratory, Harwell Oxford Didcot; OX11 0QX, United Kingdom^7;INFN-Padova, Via Marzolo 8, Padova; 35131, Italy^8;Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Lu, Shijingshan District Beijing; 100049, China^9

[效力级别] 计算机科学 [学科分类] 计算机科学（综合）

[关键词] Cloud infrastructures;Compute resources;High-level triggers;Trigger systems;User analysis;Work-flows