Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 14: Data, AI, Computing, Electronics II
T 14.7: Talk
Monday, March 16, 2026, 17:45–18:00, KH 02.014
Assessing Power-Saving Potential Through ACPI Sleep States in Data Center Rack Servers at DESY — •Sandro Grizzo1, Dwayne Spiteri2, Kilian Schwarz3, Martin Gasthuber4, Konrad Kockler5, and Jan Hartmann6 — 1sandro.grizzo@desy.de — 2dwayne.spiteri@desy.de — 3kilian.schwarz@desy.de — 4martin.gasthuber@desy.de — 5konrad.kockler@desy.de — 6jan.hartmann@desy.de
This report evaluates the feasibility of using ACPI sleep states to reduce power consumption in rack servers at the DESY data center. It outlines the ACPI power-state model, with emphasis on the S5 *soft*off* state and the Linux-specific suspend-to-idle mechanism, as these are the only sleep states typically supported on server-grade hardware. Measurements obtained via IPMI interfaces on several server models show potential power savings above 80% in S5 relative to idle mode. Suspend-to-idle provides a substantially lower reduction, but also lower wake-latencies in return. The findings indicate that using S5 for idle servers could offer considerable power-saving potential in data centers where low wake-latency is not a primary requirement.
Keywords: sustainability; ACPI sleep states; Linux; IPMI; data center