At Chronosphere, we saved 74% of our storage costs by moving petabytes of time-series data from ext4 to Btrfs, the copy-on-write filesystem for Linux. And if you’re interested, you can experimentally run Btrfs on Google Cloud Platform today. Below, in an expanded blog post based on a talk we gave at FOSDEM 2026, we unpack how we did it — without blowing up production.
What is Btrfs?
Linux is an operating system that supports multiple file systems. A filesystem is part of the operating system; it governs file organization and access. Btrfs…

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