| Issue |
EPJ Web Conf.
Volume 337, 2025
27th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2024)
|
|
|---|---|---|
| Article Number | 01331 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1051/epjconf/202533701331 | |
| Published online | 07 October 2025 | |
https://doi.org/10.1051/epjconf/202533701331
Ceph at CERN in the multi-datacentre era
CERN, Esplanade des Particules 1, 1211 Geneva 23, Switzerland
* e-mail: zachary.goggin@cern.ch
Published online: 7 October 2025
The recent commissioning of CERN’s Prévessin Data Centre (PDC) brings with it the opportunity for multi-data-centre Ceph deployments which in turn have advantages for Business Continuity and Disaster Recovery. However, the simple extension of a single cluster across data centres is impractical due to the impact of latency on Ceph’s strong consistency requirements. Dedicated techniques for such an environment are thus required.
This paper reports on our research towards building a multi-datacentre Ceph deployment in production. Due to different transaction semantics for blocks, objects and files, geo-distributing a Ceph cluster needs a different approach for each protocol in use. We here detail the challenges with Ceph across data centres, the various solutions we evaluated and a road-map for the future at CERN.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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