Speaker
Description
The CMS Submission Infrastructure is the main computing resource provisioning system for CMS workflows, including data processing, simulation and analysis. It currently aggregates nearly 400k CPU cores distributed worldwide from Grid, HPC and cloud providers. CMS Tier-0 tasks, such as data repacking and prompt reconstruction, critical for data-taking operations, are executed on a collection of computing resources at CERN, also managed by the CMS Submission Infrastructure.
All this computing power is harnessed via a number of federated resource pools, supervised by HTCondor and GlideinWMS services. Elements such as pilot factories, job schedulers and connection brokers are deployed in HA mode across several “availability zones”, providing stability to our services via hardware redundancy and numerous failover mechanisms.
Given the upcoming start of the LHC Run 3, the Submission Infrastructure stability has been recently tested in a series of controlled exercises, performed without interruption of our services. These tests have demonstrated the resilience of our systems, and additionally provided useful information in order to further refine our monitoring and alarming system.
This contribution will describe the main elements in the CMS Submission Infrastructure design and deployment, along with the performed failover exercises, proving that our systems are ready to serve their critical role in support of CMS activities.
Significance
This presentation will cover how the CMS Submission Infrastructure (SI) has been designed and set up to avoid single points of failure, along with the tests performed in order to verify its resilience and stability, considering that the SI plays a critical role in the capability of the CMS experiment's Tier-0 node to take and process collisions data.
| Experiment context, if any | The CMS experiment at the LHC at CERN |
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