render-disks
Render Persistent Disks
Persistent disks are high-performance SSDs you attach to a Render service to preserve filesystem changes across deploys and restarts. Without a disk, services have an ephemeral filesystem—all local file changes are lost on every deploy.
When to Use
- Storing file uploads, CMS media, or user-generated content
- Running a self-managed database (MySQL, MongoDB, ClickHouse) on Render
- Deploying stateful infrastructure (Elasticsearch, Kafka, RabbitMQ, Mattermost)
- Understanding why scaling is blocked or zero-downtime deploys are disabled
- Restoring data from an automatic disk snapshot
For managed databases, prefer Render Postgres (render-postgres) or Key Value (render-keyvalue) over self-managed alternatives on disk.
Critical Constraints
These constraints affect architecture decisions. Understand them before attaching a disk:
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