CERN moving 2,200+ accelerator control computers from RHEL to Debian 13

CERN is migrating over 2,200 industrial computers and embedded systems that operate its particle accelerator complex to Debian 13 by the end of 2026, according to engineers at a recent MiniDebConf. The shift, driven by Red Hat's decision to raise minimum CPU requirements in RHEL 9 and 10, avoids an estimated CHF 5.4 million hardware replacement with a 'software solution to a software problem,' per the engineers.

Bottom line — CERN's move to Debian saves an estimated CHF 5.4 million in avoidable hardware redesign costs.

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• The affected machines are spread across about 43 square kilometers, connecting to roughly 17,000 devices, per CERN engineers Federico Vaga and Nikos Tsipinakis.
• RHEL 9’s minimum x86-64-v2 CPU baseline would have eliminated 47% of CERN’s control computers, and RHEL 10’s move to x86-64-v3 would have cut another 17%, the engineers said in a risk analysis from Q2 2023.
• Debian still builds its amd64 port against the original x86-64 baseline, allowing the older hardware to continue running without replacement, per the engineers' presentation.
• The migration covers only the accelerator-control layer; CERN’s data centres and experimental computing remain on Red Hat Enterprise Linux and AlmaLinux, an organization clarification confirmed.
• CERN engineers identified gaps in Debian’s tooling for automated package building and managing multiple package versions, forcing the lab to adapt its own infrastructure including using the Koji build service with .deb support, per The Register's coverage of the talk.
• CERN has purchased support and training from Freexian and will use the Debian-backed ELTS versions of Debian 13, planning ahead toward Debian 15, according to the presentation.

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