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About Local Storage

Fast, encrypted NVMe-backed ephemeral storage on CoreWeave Nodes for scratch space, caching, and logs.

CoreWeave's CPU and GPU Nodes are equipped with NVMe-backed local ephemeral storage to provide non-persistent local storage for scratch space, caching, and logs.

Ephemeral storage​

The amount of available local ephemeral storage depends on Node type. For information on ephemeral storage size per instance type, see GPU instances and CPU-only instances.

If you require a large amount (above 20Gi) of ephemeral storage, we recommend including the size requirement in the workload's resource request.

Using hostPath volumes with ephemeral storage​

Ephemeral storage is mounted to /mnt/local on the Node. If you need to use hostPath volumes to access the Node's ephemeral storage directly, make sure you use paths under /mnt/local/:

Example
volumes:

- name: ephemeral-scratch

  hostPath:

    path: /mnt/local/my-scratch-space

    type: DirectoryOrCreate
Warning

Do not mount volumes outside of /mnt/local/ (such as /tmp/ or /var/). The Node's root filesystem is a ramdisk with limited space. Filling this ramdisk will impact Node stability.

Local Storage security​

Drives are encrypted in 8-drive RAID10 (RAID 1+0) arrays using an in-memory key. This key is lost on reboot, providing a crypto-shedding feature that renders encrypted data unusable, ensuring data security.

Non-persistent storage​

Because Node-local ephemeral storage is non-persistent, it does not persist through Node reboots, and does not require a Persistent Volume. To create a persistent File System Volume that is independent of Node status, see Create Distributed File Storage Volumes.

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