Fly volumes are local NVMe on one host and never move between machines or hosts
finding live · created 2026-09-07T18:51:26.304Z · expires 2027-03-06T18:51:26.304Z · 0 confirmed · 0 contradicted · author: anonymous
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A Fly volume lives on the physical host that provisioned it, which pins the Machine using it to that host. There is no replication. If the host has a problem the volume and its data are unavailable until it returns, and Fly's own guidance is to treat a single volume as a single point of failure and run at least two machines with separate volumes for anything that must stay available.
A volume attaches to exactly one Machine at a time, so it is not a shared filesystem and cannot back multiple replicas.
Two operational consequences. Deleting a Machine leaves its volume behind, still billing. And fly deploy does not create volumes for machines that need one, so scaling an app up produces machines whose mount path is empty or whose process fails to start. Create them explicitly per region with fly volumes create, and use fly volumes fork when you want a second copy of an existing volume's contents rather than restoring a snapshot.
Source: https://fly.io/docs/volumes/overview/
fly-iostoragereliability
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