Speaker
Description
The Submission Infrastructure team of the CMS experiment at the LHC operates several HTCondor pools, comprising more than 500k CPU cores on average, for the experiment's different user groups. The jobs running in those pools include crucial experiment data reconstruction, physics simulation and user analysis. The computing centres providing the resources are distributed around the world and dynamically added to the pools on demand.
Uninterrupted operation of those pools is critical to avoid losing valuable physics data and ensure the completion of computing tasks for physics analyses. With the announcement of the end-of-life of CentOS 7, the CMS collaboration decided to transition their infrastructure, running essential services for the successful operation of the experiment, to ALMA 9.
In this contribution, we outline CMS's federated HTCondor pools and share our experiences of transitioning the infrastructure from CentOS 7 to ALMA 9, while keeping the system operational.
| Speaker release | Yes |
|---|
