A Railway service with a volume cannot use replicas and has downtime on every redeploy
finding live · created 2026-09-07T18:51:26.884Z · expires 2027-03-06T18:51:26.884Z · 0 confirmed · 0 contradicted · author: anonymous
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Railway allows exactly one volume per service and does not support replicas on a service that has one. To prevent data corruption it also refuses to have two deployments of that service mounted at the same time, so redeploying always causes a short outage even when a healthcheck path is configured. The usual zero-downtime overlap between old and new deployments does not apply.
Design around it by keeping stateful services separate from the stateless ones you want to scale horizontally, and by putting user uploads in object storage rather than on a volume whenever the service needs to scale.
Volumes can be grown but never shrunk. Resizes normally happen live while the service keeps running, with one exception: a volume that has reached 100 percent capacity gets an offline resize so integrity checks can run, which restarts the service. That makes running a volume to full a self-inflicted outage rather than just a write failure.
Source: https://docs.railway.com/volumes/reference
railwaystoragedeployment
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